Merge pull request 'Stop the availability form failing in silence' (#137) from fix/availability-silent-failures into main

Reviewed-on: #137

.gitea/workflows/ci.yml

@@ -97,7 +97,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Check for debug statements
         run: |
-          if grep -rn --include="*.php" -E "(var_dump|var_export|print_r|error_log|dd\(|dump\()" src/; then
+          # \b keeps method calls like DateTimeImmutable::add() from matching dd(.
+          if grep -rn --include="*.php" -E "\b(var_dump|var_export|print_r|error_log|dd|dump)\s*\(" src/; then
             echo "Debug code found in src/ — please remove before merging."
             exit 1
           fi

.gitea/workflows/release.yml

@@ -0,0 +1,165 @@
+name: Release
+
+# Fires when a v* tag is pushed — including tags created through Gitea's
+# "New Release" UI. Builds the distributable plugin zip and attaches it to
+# the release for that tag (creating the release if only a bare tag was
+# pushed). The attached zip is what UpdateChecker serves to WordPress
+# sites as the update package.
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    name: Build and Publish Release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.3'
+          tools: composer:v2
+
+      # A tag that disagrees with the plugin header would make sites see a
+      # phantom update forever (or never see a real one), so fail fast.
+      - name: Verify tag matches plugin version
+        id: meta
+        run: |
+          tag_version="${GITHUB_REF_NAME#v}"
+          header_version="$(sed -nE 's/^[[:space:]]*\*?[[:space:]]*Version:[[:space:]]*([^[:space:]]+).*/\1/p' unsupervised-schedular.php | head -1)"
+          if [ "$tag_version" != "$header_version" ]; then
+            echo "Tag ${GITHUB_REF_NAME} does not match plugin header Version: ${header_version}" >&2
+            exit 1
+          fi
+          echo "version=${header_version}" >> "$GITHUB_OUTPUT"
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-interaction
+
+      - name: Run tests
+        run: composer test
+
+      - name: Build plugin zip
+        run: composer build
+
+      # Pull the section for this version out of CHANGELOG.md so it can become
+      # the release body. Matches "## [x.y.z]" and prints every line up to the
+      # next "## " heading. A missing section is a warning, not a failure — the
+      # release still publishes with empty notes.
+      - name: Extract changelog notes
+        run: |
+          version="${{ steps.meta.outputs.version }}"
+          awk -v ver="$version" '
+            $0 ~ "^## \\[" ver "\\]" { found = 1; next }
+            found && /^## / { exit }
+            found { print }
+          ' CHANGELOG.md | sed -e '/./,$!d' | tac | sed -e '/./,$!d' | tac > release-notes.md
+          if [ ! -s release-notes.md ]; then
+            echo "::warning::No CHANGELOG.md section found for version ${version}"
+          fi
+
+      - name: Publish release with zip asset
+        env:
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          api="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"
+          version="${{ steps.meta.outputs.version }}"
+          zip="dist/unsupervised-schedular-${version}.zip"
+
+          # Pre-release versions (1.2.3-rc.1) are flagged so Gitea's
+          # /releases/latest endpoint — and therefore the update checker —
+          # skips them.
+          prerelease=false
+          case "$version" in *-*) prerelease=true ;; esac
+
+          # Reuse the release if the tag was created via Gitea's release UI.
+          release_id="$(curl -sS -H "Authorization: token ${TOKEN}" \
+            "${api}/releases/tags/${GITHUB_REF_NAME}" | jq -r '.id // empty' || true)"
+
+          if [ -z "$release_id" ]; then
+            body="$(jq -Rs --arg tag "${GITHUB_REF_NAME}" --argjson pre "${prerelease}" \
+              '{tag_name:$tag, name:$tag, prerelease:$pre, body:.}' release-notes.md)"
+            release_id="$(curl -fsS -X POST "${api}/releases" \
+              -H "Authorization: token ${TOKEN}" \
+              -H 'Content-Type: application/json' \
+              -d "${body}" | jq -r '.id')"
+          else
+            # Release pre-created via the UI: fill in the notes from the changelog.
+            body="$(jq -Rs '{body:.}' release-notes.md)"
+            curl -fsS -X PATCH "${api}/releases/${release_id}" \
+              -H "Authorization: token ${TOKEN}" \
+              -H 'Content-Type: application/json' \
+              -d "${body}" > /dev/null
+          fi
+
+          echo "Attaching ${zip} to release ${release_id}"
+          curl -fsS -X POST \
+            "${api}/releases/${release_id}/assets?name=unsupervised-schedular-${version}.zip" \
+            -H "Authorization: token ${TOKEN}" \
+            -F "attachment=@${zip}" > /dev/null
+
+  # After a stable release, move main forward: bump the plugin to the next patch
+  # version and open a fresh changelog section for it, via a PR. Skipped for
+  # pre-releases (tags containing a hyphen, e.g. v1.2.0-rc.1) — those don't
+  # advance the mainline version.
+  bump-version:
+    name: Open next-version bump PR
+    needs: release
+    if: ${{ !contains(github.ref_name, '-') }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: main
+          fetch-depth: 0
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Compute next patch version
+        id: next
+        run: |
+          current="$(sed -nE 's/^[[:space:]]*\*?[[:space:]]*Version:[[:space:]]*([^[:space:]]+).*/\1/p' unsupervised-schedular.php | head -1)"
+          base="${current%%-*}"          # drop any pre-release suffix
+          major="${base%%.*}"
+          rest="${base#*.}"
+          minor="${rest%%.*}"
+          patch="${rest#*.}"
+          next="${major}.${minor}.$((patch + 1))"
+          echo "next=${next}" >> "$GITHUB_OUTPUT"
+
+      - name: Apply version bump and open changelog section
+        run: |
+          next="${{ steps.next.outputs.next }}"
+          # Plugin header + USC_VERSION constant must stay in lockstep.
+          sed -i -E "s/^([[:space:]]*\*?[[:space:]]*Version:[[:space:]]*).*/\1${next}/" unsupervised-schedular.php
+          sed -i -E "s/(define\('USC_VERSION', ')[^']+('\);)/\1${next}\2/" unsupervised-schedular.php
+          # Insert an empty section for the new version above the current top one
+          # (the first "## [" heading in the file).
+          awk -v ver="$next" '
+            !done && /^## \[/ { print "## [" ver "]"; print ""; done = 1 }
+            { print }
+          ' CHANGELOG.md > CHANGELOG.md.tmp && mv CHANGELOG.md.tmp CHANGELOG.md
+
+      - name: Open pull request
+        env:
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          next="${{ steps.next.outputs.next }}"
+          branch="release/bump-${next}"
+          api="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"
+
+          git config user.name 'Release Bot'
+          git config user.email '[email protected]'
+          git checkout -b "${branch}"
+          git commit -am "Bump version to ${next} and open changelog section"
+          git push origin "${branch}"
+
+          curl -fsS -X POST "${api}/pulls" \
+            -H "Authorization: token ${TOKEN}" \
+            -H 'Content-Type: application/json' \
+            -d "$(jq -n --arg head "${branch}" --arg title "Bump version to ${next}" \
+              '{head:$head, base:"main", title:$title, body:"Automated post-release bump to the next patch version. Record changes for this version under its changelog heading."}')" \
+            > /dev/null

CHANGELOG.md

@@ -0,0 +1,92 @@
+# Changelog
+
+All notable changes to Unsupervised Scheduler are documented in this file, one
+section per version, newest first. The top section is always the version the code
+on `main` currently carries (the `Version:` header in `unsupervised-schedular.php`).
+Whether a version is "released" is purely a matter of whether its tag exists — the
+changelog itself does not track that.
+
+When a `v*` tag is pushed, `.gitea/workflows/release.yml` publishes the matching
+`## [x.y.z]` section verbatim as the Gitea release notes, then opens a PR that bumps
+the plugin to the next patch version and adds a fresh section here for it. Record
+each change under the current top section as you work.
+
+## [1.2.4]
+
+### Fixed
+- **Adding availability no longer fails in silence.** Entering a window shorter than the chosen lesson length — 5:30–6:00 PM with the lesson length left on its default of 60 minutes, say — saved nothing and said nothing: the page just reloaded, whether the window was one-off or set to repeat for 41 weeks. The **Lesson length** menu now offers only the lengths that actually fit the window you have entered, and the form refuses to submit when none of them do. Every other way the form could quietly do nothing now explains itself too — an unreadable date, an end time before the start, a window running past midnight into the next day — and a successful save says how many bookable slots it created. Deleting says whether the slot went, and tells you when one is refused because it is already booked. Availability added through the API is checked against exactly the same rules, which it previously enforced slightly differently.
+- A student's **upcoming lessons no longer pile on top of each other**. On the booking page, the lesson name, its date and time, the status badge and the **Cancel** button could render over one another instead of sitting in a tidy row — worst with a long lesson-type name, and on narrow screens, where the row had no phone layout at all. The panel now keeps its shape whatever the theme around it does, long names wrap instead of shoving the Cancel button out of the row, and on a phone the lesson details stack above the buttons.
+- The registration page **no longer dead-ends a visitor who is already signed in**. It used to greet them with "You already have an account and are logged in." and nothing else, leaving them to find their own way to the studio. They now get a link onward to the page chosen under the block's **After registration** panel, and the link names it — "Continue to Book a Lesson" rather than the vaguer wording an invited student used to see. With no page chosen, the message appears on its own as before, because sending someone who is already signed in to the sign-in screen helps nobody.
+
+## [1.2.3]
+
+### Changed
+- A **monthly group class is now billed its price once per month**, however many times the class meets in that month. Previously the monthly charge multiplied the price by the number of sessions in the month — a class priced at `40.00 CAD` meeting weekly was billed `160.00 CAD` on the 1st — which no studio could quote honestly on a class card. A monthly **private lesson** is unchanged: its price is a per-lesson fee and the month is still billed one fee per lesson, which is why it is quoted per lesson. Studios running a monthly group class should check the class price now reads as the monthly fee they intend to charge.
+
+### Added
+- Every price a student sees now says **when** it is due. Lesson types in the booking form read `50.00 CAD at booking`, and group-class cards read `120.00 CAD up front`, `40.00 CAD weekly` or `40.00 CAD monthly` — the offering's billing mode, in the student's words. A monthly **private lesson** is quoted per lesson (`50.00 CAD per lesson monthly`), since its monthly charge covers every lesson booked that month; a monthly group class is quoted as the monthly figure it is. A free offering still just reads **Free**.
+- The **Policies** admin page can now **show you what is actually in a version**. Every row in the versions table has a **View** button that opens that version's text below the table, rendered exactly as students see it at booking and signup, whether the version is the published one, an old archived one, or a draft nobody has seen yet. The text is editable straight from the viewer, and what happens when you save depends on the version: a draft is simply updated in place, while editing a **published or archived version saves your text as a new draft version** and leaves the original exactly as students accepted it. The new draft then opens in the viewer ready to publish. Nothing a student has agreed to is ever rewritten.
+- Booking a lesson and enrolling in a class now take a **second confirmation that the student agrees to pay**. Above the Confirm button the form restates the price with its cadence, spells out how it is collected ("Charged on the 1st of each month, for that month's lessons"), adds the studio's HST so the figure matches the total actually billed, and requires a tick on "I agree to pay 56.50 CAD at booking." before it will submit — separate from, and in addition to, the studio policies the student accepts above it. Reserving a time weekly quotes the per-lesson fee and the most it can add up to ("up to 12 lessons, 678.00 CAD in total"), since a week another student takes first is simply not booked. Free offerings have nothing to agree to and show no price block.
+
+### Fixed
+- Policies are **readable where students have to accept them**. A policy typed as plain paragraphs — the normal way to write one, with no HTML — was being dropped into the booking, enrolment, and signup forms unformatted, collapsing the whole document into a single squashed line with a horizontal scrollbar and words piling on top of each other. Policy text is now formatted the same way WordPress formats post content, so blank lines become real paragraphs, and the acceptance box is styled as a proper bounded reading panel: long policies scroll vertically instead of running off the side of the page, long pasted links wrap rather than forcing the page sideways, and the "I have read and agree" tick stays in view. Policies written with HTML are unaffected. The studio registration page was also missing the plugin's stylesheet entirely, which is why the problem was at its worst there.
+
+## [1.2.2]
+
+### Added
+- The **Lesson Booking** block gained three embedding options in its sidebar. **Lesson type** pins the block to a single private-lesson type — only the times bookable as that type are listed and it is the only thing bookable there, auto-selected on the registration form — so a page about one lesson type can carry its own calendar. **Show the lesson-type filter** turns the **Show Only** control on or off. **Sections** embeds just one half of the page: booking calendar only, or the student's upcoming lessons only, so the two can live on different pages. All three are available to the shortcode as `[us_booking lesson_type="…" show_filter="no" show="booking|upcoming"]`, and the block's editor preview follows the chosen sections.
+- The booking calendar now has a **Show Only** button beside the List/Week toggle that opens a lesson-type filter, so a student browsing open times can narrow them to the types they actually want. Because not every open time can be booked as every private-lesson type — some times are tied to a specific type, others only take types of a matching length — the filter shows just the times bookable as the ticked types, and re-anchors the week view on the earliest one so it never opens on an empty week. Picking one of those times narrows the **Lesson type** picker on the registration form to the same list, and when only one type is left it is chosen automatically with its questions loaded. The type list starts collapsed and can be tucked away again without losing the filter; the button shows how many types are ticked. Tick nothing (or use **Show all types**) to see every open time as before. The filter is hidden when the studio only offers one private-lesson type.
+- The **Group Classes** block can now be pinned to a single class, under **Classes shown → Class** in the block sidebar (shortcode: `[us_group_classes offering="…"]`). Pick a class and the block shows only that one, so it can be embedded on a page that describes the class. In this mode the class's own description is left out to avoid repeating the page copy — the card shows the schedule, instructor, price, enrolment deadline and the enrol/withdraw controls. Leaving it on **All classes** keeps the full browsable catalog with descriptions.
+- The **Student Registration** block can now send students onward to a page of your choosing once they finish registering. Its **After email confirmation** panel is now **After registration**: the page you pick there is where the link shown to a newly registered student points — the "Sign in to your account" link after they confirm their email, and a "Continue to your account" link for an invited student, who is signed in immediately. A new **Redirect automatically** option takes them straight there instead of showing the link. Registration errors are never skipped — a failed sign-up and an expired confirmation link still show their message on the page, as does the "check your email to confirm your address" step. The redirect needs a page to be chosen; with none set, students see the link (or, for invited students, just the confirmation) as before.
+
+## [1.2.1]
+
+### Fixed
+- Registration questions, offering titles/notes, and policy names longer than their storage limit are no longer silently discarded. Previously typing a fixed-size field past its maximum length reported success but saved nothing — the database quietly rejected the over-long value. These fields now cap the input in the form, and the API rejects an over-long value with a clear error.
+- Students can no longer reach the WordPress dashboard. A student who navigates to `wp-admin` is redirected to the site front end and the admin toolbar is hidden for them, so they only ever see the studio's booking pages. Anyone who runs the studio — administrators, studio admins, and instructors — keeps full `wp-admin` access.
+- The instructor picker on the **Add/Edit Offering** form no longer comes up empty for a solo studio owner. When the person running the studio teaches from a WordPress administrator account (the default single-account setup), they now appear in the instructor dropdown and can be assigned to a class.
+
+## [1.2.0]
+
+### Added
+- Offerings can now bill on a schedule: **weekly** (a pending payment 24 hours before each lesson) or **monthly** (one payment on the 1st for that month's lessons), alongside the existing one-time and full-term modes. Applies to both private lessons and group classes. A daily job generates due payments, and each student receives one consolidated itemised email per scan; batched payments share a reference so the admin Payments queue groups them with a lump-sum total for e-transfer reconciliation. Cancelling a lesson never voids a scheduled payment.
+- Cancelling a lesson that was **already paid for** now credits the student that money instead of leaving it as a manual refund. The credit is one lesson's share of what they paid — the whole amount for a single lesson, or a per-lesson slice of a monthly charge or a full-term series. The daily billing scan automatically applies any available credit against a student's upcoming weekly/monthly charges before emailing their notice, which shows the credit applied and the reduced total due; a charge fully covered by credit is settled and leaves the admin Payments queue. A student's outstanding credit balance is shown on their **student detail** page in the studio admin. Still-pending (unpaid) payments continue to be voided on cancellation as before.
+- Group classes now carry an **enrolment deadline** the instructor sets on the offering. It defaults to the first day of the class, and once it passes students can no longer enrol — the enrolment page shows the class as closed and the API rejects late enrolments. While enrolment is open, each class card shows an "Enrol by" date.
+- Group classes now also carry a **withdrawal deadline** the instructor sets per class. Up to that day a student can withdraw themselves from the class (the group-class page shows a **Withdraw** button) — this frees their seat and voids any pending payment but does **not** credit their account. After the deadline self-withdrawal closes and the student must ask the studio, who can still withdraw them by hand from the student detail page. Leaving the deadline blank keeps self-withdrawal open indefinitely.
+- The **Add/Edit Offering** form now shows only the fields relevant to the selected kind: the group-class settings (capacity, dates, times, enrolment/withdrawal deadlines, sessions, schedule note, invite-only) appear only for a group class, and the weekly-reservation option only for a private lesson.
+- Instructors can add students to any group class by hand from its details page (**Add students directly**), which now appears for public classes too, not just invite-only ones. This bypasses the enrolment deadline and capacity, so a student can be enrolled as a **late enrolment** after the class has closed to self-enrolment.
+- Studio admins and instructors can open a **lesson detail view** from the Scheduler and My Lessons lists, showing the offering booked, the policy versions the student accepted (with acceptance time and IP), and their intake answers. On My Lessons an instructor may only open their own lessons; the studio Scheduler may open any.
+- The **Student Registration** block's "registration is by invitation only" message is now customisable, under a new **Invitation-only notice** panel (shortcode: `invite_only_message`). Leaving it blank keeps the default wording.
+
+### Changed
+- The student **upcoming lessons** panel now shows each booked offering's name and length beside the time, and lists only the soonest five lessons with a "Show all" reveal. The Scheduler and My Lessons week/list views likewise show the booked offering.
+
+### Fixed
+- Accepting an invitation now keeps the student signed in. Previously the registration form processed the submission after the page had started rendering, so the sign-in cookie was never sent and the new student was bounced back to the (logged-out) registration page; it is now handled before any output, and the student lands logged in.
+- Account-registration questions now save. On sites first installed before account-scope questions existed, the `us_questions.offering_id` column was left `NOT NULL` (the schema migration relied on `dbDelta`, which does not reliably relax a column to allow `NULL`), so saving an account question failed with "Column 'offering_id' cannot be null". A one-time, self-healing migration relaxes the column on the next load.
+
+## [1.1.1]
+
+### Fixed
+- The **Enable auto-updates** toggle now appears for the plugin on the Plugins screen. The self-updater now reports the plugin to WordPress even when it is already current, so core marks it update-supported and shows the toggle; previously the toggle was hidden between releases.
+
+## [1.1.0]
+
+### Added
+- Invite-only group classes, so a class can be restricted to students who hold an invite.
+- Instructor group-class roster view under **My Lessons**.
+- Cancellation cutoff that limits how close to a lesson a student can cancel.
+- Studio-defined account-registration questions collected during student sign-up.
+- Group classes now carry a specific class time (alongside the date and duration), and studio admins can assign the teaching instructor. Assigning an instructor clears their open booking slots at the class time and flags any already-booked lesson that clashes.
+- Students see who teaches each group class and when it meets on the enrolment page. Instructor names in the group-class views (front and back end) show the instructor's real name (first + last) or nickname, never their login/username.
+
+### Changed
+- Plugin metadata links now point at Unsupervised and the Gitea repository.
+- The instructor **My Group Classes** view is now a summary of classes with enrolment counts; each class links through to a per-class **details page** (class schedule, roster, and — for invite-only classes — the controls to add or invite students), rather than listing every student inline. Managing who is in an invite-only class is now done from that details page. The studio-admin **Group Classes** page is likewise a per-class summary that links through to the same details page, so a studio admin — including an owner-operator who also teaches — can view any class's roster and manage its invite-only membership.
+
+## [1.0.0]
+
+First stable release: instructor/student lesson scheduling for WordPress, including
+availability management, one-on-one and group-class booking, Stripe payments, student
+self-registration with email confirmation and admin approval, group invite links, and
+self-update from tagged Gitea releases.

CLAUDE.md

@@ -38,6 +38,8 @@ src/                  — All plugin PHP (PSR-4 namespace: Unsupervised\Schedula
   AdminMenu.php       — Registers wp-admin menu pages
   RestRegistrar.php   — Registers all REST routes under us-scheduler/v1
   ShortcodeRegistrar.php — Registers [us_booking] and [us_student_login] shortcodes
+  BlockRegistrar.php  — Registers Gutenberg dynamic-block wrappers for the shortcodes
+  BlockPreview.php    — Static editor-preview markup for the blocks
 templates/            — PHP view files included by controllers/shortcodes
 assets/               — CSS and JS (vanilla JS, no build step)
 tests/Unit/           — PHPUnit unit tests (PSR-4: Unsupervised\Schedular\Tests\)
@@ -66,6 +68,9 @@ All database access goes through repository classes within their domain package.
 | `AdminMenu` | Registers wp-admin menu pages |
 | `RestRegistrar` | Registers all REST routes under `us-scheduler/v1` |
 | `ShortcodeRegistrar` | Registers `[us_booking]` and `[us_student_login]` shortcodes |
+| `BlockRegistrar` | Registers Gutenberg dynamic-block wrappers for the shortcodes |
+| `BlockPreview` | Static editor-preview markup for the blocks |
+| `Val` | Runtime coercion of untyped WP boundary values (wpdb rows, REST params, superglobals) |
 | `Auth\RoleManager` | Registers `us_instructor` and `us_student` roles with custom caps |
 | `Auth\LoginPage` | Renders front-end student login form |
 | `Availability\AvailabilitySlot` | Immutable value object for a slot row |
@@ -95,6 +100,7 @@ All test classes extend `tests/Unit/TestCase.php`, which handles `Monkey\setUp()
 - When mocking `$wpdb`, set `$mock->prefix = 'wp_'` explicitly — it is a public property, not a method
 
 ### Adding a Feature
+0. **If the feature touches `Schema.php`, bump both the `Version:` header and `USC_VERSION` in `unsupervised-schedular.php`.** `Plugin::boot()` only re-runs `Installer`/`dbDelta` when the stored `us_schedular_version` differs, so a schema change without a version bump never reaches existing sites and inserts into new columns fail silently.
 1. Write the feature doc in `docs/features/<feature-name>.md` (data model, API, classes, test paths).
 2. Create a domain package under `src/<Domain>/` containing all classes for that feature.
 3. Add template(s) under `templates/` if needed.
@@ -104,6 +110,6 @@ All test classes extend `tests/Unit/TestCase.php`, which handles `Monkey\setUp()
 ### CI
 Gitea Actions (`.gitea/workflows/ci.yml`) runs on every push and pull request:
 - **lint** — PHPCS WordPress coding standards
-- **static-analysis** — PHPStan level 6
+- **static-analysis** — PHPStan level 10
 - **test** — PHPUnit on PHP 8.1, 8.2, 8.3
 - **no-debug** — rejects commits with `var_dump`, `error_log`, etc. in `src/`

README.md

@@ -2,9 +2,9 @@
 
 A WordPress plugin for instructor/student lesson scheduling — private lessons and
 group classes — with offerings, intake questions, versioned policies, account
-registration, and (coming) online payments.
+registration, and online payments.
 
-**Version:** 1.0.0-rc.1 · **Requires:** WordPress 6.0+, PHP 8.1+ · **License:** GPL-2.0-or-later
+**Version:** 1.0.0 · **Requires:** WordPress 6.0+, PHP 8.1+ · **License:** GPL-2.0-or-later
 
 > Pre-release. The booking platform is being built feature-by-feature; see
 > [Implementation status](#implementation-status) below.
@@ -31,17 +31,13 @@ model, REST API, classes, and tests. For contributor/architecture guidance see
 | Availability (durations, weekly recurrence, calendar) | [availability-management.md](docs/features/availability-management.md) | ✅ Implemented |
 | Registration questions (per-offering intake) | [registration-questions.md](docs/features/registration-questions.md) | ✅ Implemented |
 | Policies (drafting, versioning, tracked acceptance) | [policies.md](docs/features/policies.md) | ✅ Implemented |
-| Account registration (invite-only, signup policy acceptance) | [account-registration.md](docs/features/account-registration.md) | ✅ Implemented |
+| Account registration (invite or open self-approval, email confirmation, signup policy acceptance) | [account-registration.md](docs/features/account-registration.md) | ✅ Implemented |
 | Lesson booking (offering → questions → policies) | [lesson-booking.md](docs/features/lesson-booking.md) | ✅ Implemented |
 | Group classes (capacity-enforced enrolment) | [group-classes.md](docs/features/group-classes.md) | ✅ Implemented |
 | Student administration (studio-admin view) | [student-administration.md](docs/features/student-administration.md) | ✅ Implemented |
-| Payments (e-transfer/comp + receipts + HST; Stripe card charge pending) | [payments.md](docs/features/payments.md) | 🟡 Partial |
+| Payments (Stripe card charge + e-transfer/comp + receipts + HST) | [payments.md](docs/features/payments.md) | ✅ Implemented |
 | Payment reporting (monthly per-instructor + HST + CSV) | [payment-reporting.md](docs/features/payment-reporting.md) | ✅ Implemented |
 
-> Payments are deliberately deferred to the end: booking and enrolment ship with a
-> clean seam (a lesson lands `pending`, an enrolment `active`, with `payment_id`
-> null) into which the pay→confirm + receipt step plugs later.
-
 ## Shortcodes
 
 | Shortcode | Purpose |
@@ -49,7 +45,7 @@ model, REST API, classes, and tests. For contributor/architecture guidance see
 | `[us_booking]` | Student calendar + private-lesson registration flow |
 | `[us_group_classes]` | Browse and enrol in group classes |
 | `[us_student_login]` | Front-end student login |
-| `[us_student_register]` | Invite-based account registration (accepts signup policies) |
+| `[us_student_register]` | Account registration — invite-based, or open self-signup with email confirmation + admin approval (accepts signup policies) |
 
 ## REST API
 

assets/css/frontend.css

@@ -33,3 +33,364 @@
     color: #c00;
     margin-top: 8px;
 }
+
+/*
+ * The upcoming-lessons panel. Every rule here is scoped under #us-booking-app —
+ * the same id-level specificity .us-slot above uses — because these rows sit in
+ * whatever layout the theme provides and carry more content than a calendar
+ * cell. Bare class selectors lost to theme rules on div/span/strong, which
+ * collapsed the flex layout and piled the details on top of the actions.
+ */
+#us-booking-app .us-my-lessons {
+    margin-bottom: 24px;
+}
+
+#us-booking-app .us-my-lesson {
+    box-sizing: border-box;
+    max-width: 100%;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    padding: 12px 16px;
+    margin-bottom: 8px;
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: space-between;
+    align-items: center;
+    gap: 8px 12px;
+}
+
+/*
+ * `min-width: 0` lets the title column shrink below its content width — without
+ * it a long offering title cannot compress and shoves the status pill and
+ * Cancel button out of the row. The flex-basis keeps the details and the
+ * actions on one line while there is room, and wraps them once there is not.
+ */
+#us-booking-app .us-my-lesson-info {
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+    flex: 1 1 14em;
+    min-width: 0;
+}
+
+#us-booking-app .us-my-lesson-title,
+#us-booking-app .us-my-lesson-when {
+    overflow-wrap: break-word;
+    word-break: break-word;
+}
+
+#us-booking-app .us-my-lesson-title {
+    font-size: 1.05em;
+}
+
+#us-booking-app .us-my-lesson-duration {
+    font-weight: normal;
+    color: #666;
+}
+
+#us-booking-app .us-my-lesson-when {
+    color: #555;
+}
+
+#us-booking-app .us-my-lesson-actions {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px 12px;
+    align-items: center;
+}
+
+#us-booking-app .us-show-all-lessons {
+    background: transparent;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    padding: 6px 14px;
+    cursor: pointer;
+}
+
+#us-booking-app .us-show-all-lessons:hover {
+    border-color: #888;
+}
+
+#us-booking-app .us-cancel-lesson {
+    background: transparent;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    padding: 4px 12px;
+    cursor: pointer;
+    color: #c00;
+}
+
+#us-booking-app .us-cancel-lesson:hover {
+    border-color: #c00;
+}
+
+#us-booking-app .us-lesson-status {
+    display: inline-block;
+    font-size: 0.85em;
+    font-weight: 600;
+    padding: 2px 10px;
+    border-radius: 10px;
+    background: #eee;
+    white-space: nowrap;
+}
+
+#us-booking-app .us-lesson-status-confirmed {
+    background: #e2f5e5;
+    color: #1a7d2e;
+}
+
+#us-booking-app .us-lesson-status-pending {
+    background: #fdf3d7;
+    color: #8a6d1a;
+}
+
+.us-calendar-controls {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: space-between;
+    align-items: center;
+    gap: 8px;
+    margin-bottom: 12px;
+}
+
+.us-filter-toggle {
+    padding: 6px 16px;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    background: transparent;
+    cursor: pointer;
+}
+
+.us-filter-toggle.us-active {
+    background: #333;
+    border-color: #333;
+    color: #fff;
+}
+
+.us-type-filter {
+    margin-bottom: 12px;
+    padding: 8px 12px;
+    border: 1px solid #eee;
+    border-radius: 4px;
+}
+
+.us-type-filter-heading {
+    display: block;
+    margin-bottom: 6px;
+    font-weight: 600;
+}
+
+.us-type-filter-choices {
+    display: flex;
+    flex-wrap: wrap;
+    align-items: center;
+    gap: 8px 16px;
+}
+
+.us-type-filter-choice {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+}
+
+.us-type-filter-clear {
+    margin-left: auto;
+    padding: 4px 12px;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    background: transparent;
+    cursor: pointer;
+}
+
+.us-view-toggle {
+    display: flex;
+    gap: 8px;
+}
+
+.us-view-toggle button {
+    padding: 6px 16px;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    background: transparent;
+    cursor: pointer;
+}
+
+.us-view-toggle button.us-active {
+    background: #333;
+    border-color: #333;
+    color: #fff;
+}
+
+.us-week-nav {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    gap: 8px;
+    margin-bottom: 12px;
+}
+
+.us-week-nav button {
+    padding: 6px 12px;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    background: transparent;
+    cursor: pointer;
+}
+
+.us-week-grid {
+    display: grid;
+    grid-template-columns: repeat(7, 1fr);
+    gap: 8px;
+}
+
+.us-week-day {
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    padding: 8px;
+    min-height: 90px;
+}
+
+.us-week-day-heading {
+    margin: 0 0 8px;
+    font-size: 0.85em;
+    text-align: center;
+}
+
+.us-week-slot {
+    display: block;
+    width: 100%;
+    margin-bottom: 6px;
+}
+
+.us-week-empty {
+    display: block;
+    text-align: center;
+    opacity: 0.4;
+}
+
+/* The price and pay agreement on a booking / enrolment form. */
+.us-price {
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    padding: 12px 16px;
+    margin: 16px 0;
+}
+
+.us-price h4 {
+    margin: 0 0 8px;
+}
+
+.us-price p {
+    margin: 0 0 4px;
+}
+
+.us-price-amount strong {
+    font-size: 1.15em;
+}
+
+.us-price-cadence {
+    margin-left: 4px;
+}
+
+.us-price-tax,
+.us-price-note {
+    font-size: 0.9em;
+    opacity: 0.8;
+}
+
+.us-price-agree {
+    display: block;
+    margin-top: 12px;
+    font-weight: 600;
+}
+
+/* The cadence-carrying price on a group-class card. */
+.us-class-price {
+    font-weight: 600;
+}
+
+/* Policy acceptance — booking, enrolment, and signup all render this markup. */
+.us-policy {
+    margin: 16px 0;
+}
+
+.us-policy h4 {
+    margin: 0 0 6px;
+}
+
+/*
+ * The body is admin-authored HTML sitting inside whatever layout the theme
+ * provides, so it gets an explicit reading box rather than inheriting one.
+ * `overflow-wrap` breaks pasted URLs instead of letting one long token force
+ * the horizontal scrollbar, and the bounded height keeps a long policy from
+ * pushing the accept checkbox off the screen.
+ */
+.us-policy-body {
+    box-sizing: border-box;
+    max-width: 100%;
+    max-height: 260px;
+    overflow-y: auto;
+    overflow-x: hidden;
+    padding: 12px 14px;
+    margin-bottom: 8px;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    background: #fafafa;
+    white-space: normal;
+    overflow-wrap: break-word;
+    word-break: break-word;
+    line-height: 1.5;
+    text-align: left;
+}
+
+.us-policy-body p,
+.us-policy-body ul,
+.us-policy-body ol {
+    margin: 0 0 0.75em;
+    max-width: 100%;
+}
+
+.us-policy-body ul,
+.us-policy-body ol {
+    padding-left: 1.5em;
+}
+
+.us-policy-body > :last-child {
+    margin-bottom: 0;
+}
+
+.us-policy-accept,
+.us-policies input[type="checkbox"] {
+    margin-right: 6px;
+}
+
+@media (max-width: 640px) {
+    .us-week-grid {
+        grid-template-columns: 1fr;
+    }
+
+    .us-week-day {
+        min-height: 0;
+    }
+
+    /*
+     * A lesson row carries a title, a date/time, a status pill and a button —
+     * more than fits one narrow line, so stack the details above the actions
+     * rather than letting them wrap into each other.
+     */
+    #us-booking-app .us-my-lesson {
+        flex-direction: column;
+        align-items: stretch;
+    }
+
+    #us-booking-app .us-my-lesson-info {
+        flex: 0 0 auto;
+    }
+}
+
+/* Shown only in block-editor previews (see BlockPreview). */
+.us-editor-note {
+    font-size: 0.85em;
+    font-style: italic;
+    opacity: 0.7;
+}

assets/js/availability-admin.js

@@ -0,0 +1,98 @@
+/**
+ * Availability form: keep the lesson-length choices honest.
+ *
+ * A window is stored as consecutive lesson-length slots, so one shorter than the
+ * chosen lesson length holds no slots at all and saves nothing. Picking 5:30–6:00
+ * PM while the length select sat on its default of 60 minutes used to do exactly
+ * that, silently. The server now rejects it with a message; this narrows the
+ * choices first so the mistake is hard to make.
+ *
+ * This is a convenience only — AvailabilityController and the REST endpoint both
+ * validate the same window server-side regardless of what happens here.
+ */
+(function () {
+    'use strict';
+
+    const form = document.getElementById('usc-add-availability');
+    if (!form) return;
+
+    const startEl    = document.getElementById('start_dt');
+    const endEl      = document.getElementById('end_dt');
+    const durationEl = document.getElementById('duration_minutes');
+    const warningEl  = document.getElementById('usc-duration-warning');
+    const submitEl   = form.querySelector('input[type="submit"], button[type="submit"]');
+
+    if (!startEl || !endEl || !durationEl) return;
+
+    /**
+     * Minutes between the two datetime-local inputs, or 0 when the pair is not a
+     * usable window yet — empty, unparseable, backwards, or spanning two days
+     * (which the server rejects on its own terms, with its own message).
+     */
+    function windowMinutes() {
+        const start = new Date(startEl.value);
+        const end   = new Date(endEl.value);
+
+        if (!startEl.value || !endEl.value || isNaN(start) || isNaN(end)) return 0;
+        if (end <= start) return 0;
+        if (startEl.value.slice(0, 10) !== endEl.value.slice(0, 10)) return 0;
+
+        return Math.round((end - start) / 60000);
+    }
+
+    function refresh() {
+        const minutes = windowMinutes();
+        const options = Array.from(durationEl.options);
+
+        // No usable window yet: leave every choice alone rather than fighting
+        // someone part-way through typing a date.
+        if (minutes === 0) {
+            options.forEach((option) => {
+                option.hidden   = false;
+                option.disabled = false;
+            });
+            setBlocked(false);
+            return;
+        }
+
+        let fits = [];
+
+        options.forEach((option) => {
+            const tooLong = Number(option.value) > minutes;
+
+            option.hidden   = tooLong;
+            option.disabled = tooLong;
+
+            if (!tooLong) fits.push(option);
+        });
+
+        if (fits.length === 0) {
+            // Nothing bookable fits, so the form cannot produce a single slot.
+            setBlocked(true);
+            return;
+        }
+
+        setBlocked(false);
+
+        // The selection may have just been hidden — fall back to the longest
+        // length that still fits, which is what the instructor most likely wants.
+        if (durationEl.selectedOptions[0] && durationEl.selectedOptions[0].disabled) {
+            durationEl.value = fits.reduce(
+                (longest, option) => (Number(option.value) > Number(longest.value) ? option : longest),
+                fits[0]
+            ).value;
+        }
+    }
+
+    function setBlocked(blocked) {
+        if (warningEl) warningEl.hidden = !blocked;
+        if (submitEl) submitEl.disabled = blocked;
+    }
+
+    startEl.addEventListener('change', refresh);
+    startEl.addEventListener('input', refresh);
+    endEl.addEventListener('change', refresh);
+    endEl.addEventListener('input', refresh);
+
+    refresh();
+}());

assets/js/blocks.js

@@ -0,0 +1,316 @@
+/* global wp */
+(function () {
+    'use strict';
+
+    const { registerBlockType } = wp.blocks;
+    const { createElement: el, useState, useEffect } = wp.element;
+    const { useBlockProps, InspectorControls } = wp.blockEditor;
+    const { PanelBody, SelectControl, ToggleControl, TextareaControl } = wp.components;
+    const { useSelect } = wp.data;
+    const apiFetch = wp.apiFetch;
+    const ServerSideRender = wp.serverSideRender;
+    const { __ } = wp.i18n;
+
+    /**
+     * Dropdown of published pages with a leading "default" choice.
+     * Values are page IDs; 0 means the default behaviour.
+     */
+    function PageSelect(props) {
+        const pages = useSelect(
+            (select) => select('core').getEntityRecords('postType', 'page', {
+                per_page: -1,
+                orderby: 'title',
+                order: 'asc',
+                status: 'publish',
+                _fields: 'id,title',
+            }),
+            []
+        );
+
+        const options = [{ label: props.defaultLabel, value: '0' }].concat(
+            (pages || []).map((page) => ({
+                label: (page.title && page.title.rendered) || __('(no title)', 'unsupervised-schedular'),
+                value: String(page.id),
+            }))
+        );
+
+        return el(SelectControl, {
+            label: props.label,
+            help: props.help,
+            value: String(props.value || 0),
+            options: options,
+            onChange: (value) => props.onChange(parseInt(value, 10) || 0),
+        });
+    }
+
+    /**
+     * Dropdown of active group classes fetched from the plugin's public
+     * offerings endpoint. Values are offering IDs; 0 means all classes.
+     */
+    function GroupClassSelect(props) {
+        const [offerings, setOfferings] = useState(null);
+
+        useEffect(() => {
+            apiFetch({ path: '/us-scheduler/v1/offerings?kind=group_class' })
+                .then(setOfferings)
+                .catch(() => setOfferings([]));
+        }, []);
+
+        const options = [{ label: __('All classes', 'unsupervised-schedular'), value: '0' }].concat(
+            (offerings || []).map((o) => ({
+                label: o.title || __('(no title)', 'unsupervised-schedular'),
+                value: String(o.id),
+            }))
+        );
+
+        // A previously chosen class that is no longer offered (deleted or
+        // deactivated) keeps its stored id visible instead of silently
+        // pretending "All classes" is selected.
+        const value = String(props.value || 0);
+        if (offerings !== null && !options.some((opt) => opt.value === value)) {
+            options.push({
+                label: __('Unavailable class #', 'unsupervised-schedular') + value,
+                value: value,
+            });
+        }
+
+        return el(SelectControl, {
+            label: props.label,
+            help: props.help,
+            value: value,
+            options: options,
+            onChange: (newValue) => props.onChange(parseInt(newValue, 10) || 0),
+        });
+    }
+
+    /**
+     * Dropdown of active private-lesson types fetched from the plugin's public
+     * offerings endpoint. Values are offering IDs; 0 means every type.
+     */
+    function LessonTypeSelect(props) {
+        const [offerings, setOfferings] = useState(null);
+
+        useEffect(() => {
+            apiFetch({ path: '/us-scheduler/v1/offerings?kind=private_lesson' })
+                .then(setOfferings)
+                .catch(() => setOfferings([]));
+        }, []);
+
+        const options = [{ label: __('All lesson types', 'unsupervised-schedular'), value: '0' }].concat(
+            (offerings || []).map((o) => ({
+                label: o.duration_minutes
+                    ? `${o.title} (${o.duration_minutes} min)`
+                    : (o.title || __('(no title)', 'unsupervised-schedular')),
+                value: String(o.id),
+            }))
+        );
+
+        // A previously chosen type that is no longer offered keeps its stored
+        // id visible instead of silently pretending "All lesson types" is set.
+        const value = String(props.value || 0);
+        if (offerings !== null && !options.some((opt) => opt.value === value)) {
+            options.push({
+                label: __('Unavailable lesson type #', 'unsupervised-schedular') + value,
+                value: value,
+            });
+        }
+
+        return el(SelectControl, {
+            label: props.label,
+            help: props.help,
+            value: value,
+            options: options,
+            onChange: (newValue) => props.onChange(parseInt(newValue, 10) || 0),
+        });
+    }
+
+    const blocks = [
+        {
+            name: 'us-scheduler/booking',
+            title: __('Lesson Booking', 'unsupervised-schedular'),
+            description: __('Lets students browse availability and book lessons. Shows a styled preview in the editor.', 'unsupervised-schedular'),
+            icon: 'calendar-alt',
+            keywords: ['booking', 'lesson', 'schedule'],
+            shortcode: 'us_booking',
+            attributes: {
+                loginPageId: { type: 'number', default: 0 },
+                autoRedirect: { type: 'boolean', default: false },
+                lessonTypeId: { type: 'number', default: 0 },
+                showTypeFilter: { type: 'boolean', default: true },
+                displayMode: { type: 'string', default: 'both' },
+            },
+            inspector: (attributes, setAttributes) => [
+                el(
+                    PanelBody,
+                    { title: __('What to show', 'unsupervised-schedular'), key: 'display' },
+                    el(SelectControl, {
+                        label: __('Sections', 'unsupervised-schedular'),
+                        help: __('Split the page in two: a booking calendar here, the student’s upcoming lessons somewhere else.', 'unsupervised-schedular'),
+                        value: attributes.displayMode || 'both',
+                        options: [
+                            { label: __('Booking and upcoming lessons', 'unsupervised-schedular'), value: 'both' },
+                            { label: __('Booking only', 'unsupervised-schedular'), value: 'booking' },
+                            { label: __('Upcoming lessons only', 'unsupervised-schedular'), value: 'upcoming' },
+                        ],
+                        onChange: (displayMode) => setAttributes({ displayMode }),
+                    })
+                ),
+                el(
+                    PanelBody,
+                    { title: __('Lesson types', 'unsupervised-schedular'), key: 'lesson-types' },
+                    el(LessonTypeSelect, {
+                        label: __('Lesson type', 'unsupervised-schedular'),
+                        help: __('Show only the times bookable as one lesson type, for embedding on a page dedicated to it. That type is then the only one students can book here.', 'unsupervised-schedular'),
+                        value: attributes.lessonTypeId,
+                        onChange: (lessonTypeId) => setAttributes({ lessonTypeId }),
+                    }),
+                    el(ToggleControl, {
+                        label: __('Show the lesson-type filter', 'unsupervised-schedular'),
+                        help: __('Offer students the “Show Only” button that narrows the calendar to chosen lesson types. Not used when a single lesson type is set above.', 'unsupervised-schedular'),
+                        checked: attributes.showTypeFilter !== false,
+                        onChange: (showTypeFilter) => setAttributes({ showTypeFilter }),
+                    })
+                ),
+                el(
+                    PanelBody,
+                    { title: __('Logged-out visitors', 'unsupervised-schedular'), key: 'logged-out' },
+                    el(PageSelect, {
+                        label: __('Login page', 'unsupervised-schedular'),
+                        help: __('Where the log-in link sends visitors who are not logged in.', 'unsupervised-schedular'),
+                        defaultLabel: __('WordPress login screen', 'unsupervised-schedular'),
+                        value: attributes.loginPageId,
+                        onChange: (loginPageId) => setAttributes({ loginPageId }),
+                    }),
+                    el(ToggleControl, {
+                        label: __('Redirect automatically', 'unsupervised-schedular'),
+                        help: __('Send logged-out visitors straight to the login page instead of showing a link.', 'unsupervised-schedular'),
+                        checked: !!attributes.autoRedirect,
+                        onChange: (autoRedirect) => setAttributes({ autoRedirect }),
+                    })
+                ),
+            ],
+        },
+        {
+            name: 'us-scheduler/student-login',
+            title: __('Student Login', 'unsupervised-schedular'),
+            description: __('The front-end login form for students.', 'unsupervised-schedular'),
+            icon: 'admin-users',
+            keywords: ['login', 'student', 'sign in'],
+            shortcode: 'us_student_login',
+            attributes: {
+                bookingPageId: { type: 'number', default: 0 },
+                autoRedirect: { type: 'boolean', default: false },
+            },
+            inspector: (attributes, setAttributes) => el(
+                PanelBody,
+                { title: __('Logged-in visitors', 'unsupervised-schedular') },
+                el(PageSelect, {
+                    label: __('Booking page', 'unsupervised-schedular'),
+                    help: __('Where students are sent after logging in, and where the link shown to already-logged-in visitors points.', 'unsupervised-schedular'),
+                    defaultLabel: __('This page', 'unsupervised-schedular'),
+                    value: attributes.bookingPageId,
+                    onChange: (bookingPageId) => setAttributes({ bookingPageId }),
+                }),
+                el(ToggleControl, {
+                    label: __('Redirect automatically', 'unsupervised-schedular'),
+                    help: __('Send logged-in visitors straight to the booking page instead of showing a link. Requires a booking page to be chosen.', 'unsupervised-schedular'),
+                    checked: !!attributes.autoRedirect,
+                    onChange: (autoRedirect) => setAttributes({ autoRedirect }),
+                })
+            ),
+        },
+        {
+            name: 'us-scheduler/student-register',
+            title: __('Student Registration', 'unsupervised-schedular'),
+            description: __('The invite-only student registration form.', 'unsupervised-schedular'),
+            icon: 'welcome-add-page',
+            keywords: ['register', 'student', 'invite'],
+            shortcode: 'us_student_register',
+            attributes: {
+                loginPageId: { type: 'number', default: 0 },
+                autoRedirect: { type: 'boolean', default: false },
+                inviteOnlyMessage: { type: 'string', default: '' },
+            },
+            inspector: (attributes, setAttributes) => [
+                el(
+                    PanelBody,
+                    { title: __('After registration', 'unsupervised-schedular'), key: 'confirmation' },
+                    el(PageSelect, {
+                        label: __('Sign-in page', 'unsupervised-schedular'),
+                        help: __('Where students are sent once registration finishes — after they confirm their email address, or straight away for an invited student.', 'unsupervised-schedular'),
+                        defaultLabel: __('WordPress login screen', 'unsupervised-schedular'),
+                        value: attributes.loginPageId,
+                        onChange: (loginPageId) => setAttributes({ loginPageId }),
+                    }),
+                    el(ToggleControl, {
+                        label: __('Redirect automatically', 'unsupervised-schedular'),
+                        help: __('Send students straight to that page instead of showing the link. Requires a page to be chosen; errors and the "check your email" step are never skipped.', 'unsupervised-schedular'),
+                        checked: !!attributes.autoRedirect,
+                        onChange: (autoRedirect) => setAttributes({ autoRedirect }),
+                    })
+                ),
+                el(
+                    PanelBody,
+                    { title: __('Invitation-only notice', 'unsupervised-schedular'), key: 'invite-only' },
+                    el(TextareaControl, {
+                        label: __('Message', 'unsupervised-schedular'),
+                        help: __('Shown when registration is invite-only and the visitor has no valid invite link. Leave blank to use the default wording.', 'unsupervised-schedular'),
+                        value: attributes.inviteOnlyMessage,
+                        onChange: (inviteOnlyMessage) => setAttributes({ inviteOnlyMessage }),
+                    })
+                ),
+            ],
+        },
+        {
+            name: 'us-scheduler/group-classes',
+            title: __('Group Classes', 'unsupervised-schedular'),
+            description: __('Lets students browse and enrol in group classes. Shows a styled preview in the editor.', 'unsupervised-schedular'),
+            icon: 'groups',
+            keywords: ['group', 'class', 'enrol'],
+            shortcode: 'us_group_classes',
+            attributes: {
+                offeringId: { type: 'number', default: 0 },
+            },
+            inspector: (attributes, setAttributes) => el(
+                PanelBody,
+                { title: __('Classes shown', 'unsupervised-schedular') },
+                el(GroupClassSelect, {
+                    label: __('Class', 'unsupervised-schedular'),
+                    help: __('Show only one group class, for embedding on a page dedicated to it. That class’s description is left out — the card shows just the schedule, price and enrolment controls.', 'unsupervised-schedular'),
+                    value: attributes.offeringId,
+                    onChange: (offeringId) => setAttributes({ offeringId }),
+                })
+            ),
+        },
+    ];
+
+    blocks.forEach((def) => {
+        registerBlockType(def.name, {
+            apiVersion: 3,
+            title: def.title,
+            description: def.description,
+            icon: def.icon,
+            category: 'widgets',
+            keywords: def.keywords,
+            supports: { html: false, multiple: false },
+            attributes: def.attributes || {},
+            example: {},
+            edit: function Edit(props) {
+                const inspector = def.inspector
+                    ? el(InspectorControls, {}, def.inspector(props.attributes, props.setAttributes))
+                    : null;
+
+                return el(
+                    'div',
+                    useBlockProps(),
+                    inspector,
+                    el(ServerSideRender, { block: def.name, attributes: props.attributes })
+                );
+            },
+            save: () => null,
+            transforms: {
+                from: [{ type: 'shortcode', tag: def.shortcode }],
+            },
+        });
+    });
+}());

assets/js/booking.js

@@ -5,11 +5,17 @@
     const app = document.getElementById('us-booking-app');
     if (!app) return;
 
-    const slotList = document.getElementById('us-slot-list');
-    const confirm  = document.getElementById('us-booking-confirmation');
-    const errorBox = document.getElementById('us-booking-error');
+    const slotList  = document.getElementById('us-slot-list');
+    const myLessons = document.getElementById('us-my-lessons');
+    const confirm   = document.getElementById('us-booking-confirmation');
+    const errorBox  = document.getElementById('us-booking-error');
     const { restUrl, nonce } = usScheduler;
 
+    // Per-instance options from the block/shortcode: pin the page to a single
+    // lesson type, and whether the "Show Only" filter is offered at all.
+    const pinnedTypeId  = Number(app.dataset.lessonType) || 0;
+    const filterEnabled = app.dataset.typeFilter !== '0';
+
     function apiFetch(path, options = {}) {
         return fetch(restUrl + path, {
             ...options,
@@ -43,7 +49,13 @@
     }
 
     const dayKey  = (dt) => String(dt).slice(0, 10);
-    const timeOf  = (dt) => String(dt).slice(11, 16);
+
+    // "2026-07-06 14:30:00" → "2:30 PM"
+    function timeOf(dt) {
+        const hours   = Number(String(dt).slice(11, 13));
+        const minutes = String(dt).slice(14, 16);
+        return `${hours % 12 || 12}:${minutes} ${hours < 12 ? 'AM' : 'PM'}`;
+    }
 
     function dayLabel(key) {
         const date = new Date(key + 'T00:00:00');
@@ -53,6 +65,12 @@
         });
     }
 
+    function shortDayLabel(key) {
+        const date = new Date(key + 'T00:00:00');
+        if (Number.isNaN(date.getTime())) return key;
+        return date.toLocaleDateString(undefined, { weekday: 'short', month: 'short', day: 'numeric' });
+    }
+
     function groupByDay(slots) {
         const groups = new Map();
         slots.forEach((slot) => {
@@ -63,14 +81,128 @@
         return [...groups.entries()].sort((a, b) => a[0].localeCompare(b[0]));
     }
 
-    // Agenda-style calendar: available slots grouped by day.
-    function renderSlots(slots) {
-        if (!slots.length) {
-            slotList.innerHTML = '<p>No available lesson slots at this time.</p>';
-            return;
-        }
+    // --- calendar view state (week is the default; week keeps its position) ---
+    let allSlots  = [];
+    let view      = 'week';
+    let weekStart = null;
 
-        slotList.innerHTML = groupByDay(slots).map(([key, daySlots]) => `
+    // Every active private-lesson type the student may book, across instructors.
+    let catalog = [];
+
+    // Lesson types the student has filtered the calendar down to; empty means
+    // "no filter" — every open slot is shown. The list starts collapsed behind
+    // the "Show Only" button and stays open across re-renders once revealed.
+    const selectedTypeIds = new Set();
+    let filterOpen = false;
+
+    // Whether an offering can be booked into a slot — the client-side mirror of
+    // the rule `POST /bookings` enforces: a slot tied to an offering takes that
+    // offering only, and a generic slot takes any of its instructor's types
+    // whose length fits.
+    function offeringFitsSlot(offering, slot) {
+        if (Number(offering.instructor_id) !== Number(slot.instructor_id)) return false;
+
+        const tiedId = Number(slot.offering_id) || 0;
+        if (tiedId) return Number(offering.id) === tiedId;
+
+        return !offering.duration_minutes
+            || Number(offering.duration_minutes) === Number(slot.duration_minutes);
+    }
+
+    const filterActive = () => selectedTypeIds.size > 0;
+
+    const typeSelected = (offering) => !filterActive() || selectedTypeIds.has(Number(offering.id));
+
+    // The lesson types this slot could be booked as, honouring the filter.
+    function slotChoices(slot) {
+        return catalog.filter((o) => offeringFitsSlot(o, slot) && typeSelected(o));
+    }
+
+    // With a filter set, a slot is only shown when one of the chosen lesson
+    // types can actually be booked into it.
+    function visibleSlots() {
+        if (!filterActive()) return allSlots;
+        return allSlots.filter((slot) => slotChoices(slot).length > 0);
+    }
+
+    const pad   = (n) => String(n).padStart(2, '0');
+    const toKey = (d) => `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}`;
+
+    function addDays(key, days) {
+        const date = new Date(key + 'T00:00:00');
+        date.setDate(date.getDate() + days);
+        return toKey(date);
+    }
+
+    // First day of the week containing `key`, honouring the site's
+    // start-of-week setting (0 = Sunday … 6 = Saturday).
+    function weekStartOf(key) {
+        const startOfWeek = Number(usScheduler.startOfWeek) || 0;
+        const date = new Date(key + 'T00:00:00');
+        return addDays(key, -((date.getDay() - startOfWeek + 7) % 7));
+    }
+
+    // The calendar's control row: the view toggle, and the button that reveals
+    // the lesson-type filter beneath it.
+    function controlsHtml() {
+        return `
+            <div class="us-calendar-controls">
+                <div class="us-view-toggle" role="group" aria-label="Calendar view">
+                    <button type="button" id="us-view-list" class="${view === 'list' ? 'us-active' : ''}">List</button>
+                    <button type="button" id="us-view-week" class="${view === 'week' ? 'us-active' : ''}">Week</button>
+                </div>
+                ${filterToggleHtml()}
+            </div>`;
+    }
+
+    // Nothing to filter with a single bookable type, so the control only
+    // appears once there is a choice to make.
+    function filterToggleHtml() {
+        if (!filterEnabled || catalog.length < 2) return '';
+
+        const count = filterActive() ? ` (${selectedTypeIds.size})` : '';
+
+        return `
+            <button type="button" id="us-filter-toggle" class="us-filter-toggle${filterActive() ? ' us-active' : ''}"
+                aria-expanded="${filterOpen}" aria-controls="us-type-filter">Show Only${count}</button>`;
+    }
+
+    // "Piano Lesson (30 min)" — the instructor's name is only worth the space
+    // when the catalog spans more than one of them.
+    function filterLabel(offering) {
+        const duration = offering.duration_minutes ? ` (${offering.duration_minutes} min)` : '';
+        const instructors = new Set(catalog.map((o) => Number(o.instructor_id)));
+        const who = instructors.size > 1 && offering.instructor_name
+            ? ` — ${offering.instructor_name}`
+            : '';
+        return `${offering.title}${duration}${who}`;
+    }
+
+    // The lesson-type list itself — collapsed until the student opens it, and
+    // rendered between the control row and the calendar.
+    function filterHtml() {
+        if (!filterEnabled || catalog.length < 2 || !filterOpen) return '';
+
+        const choices = catalog.map((o) => `
+            <label class="us-type-filter-choice">
+                <input type="checkbox" class="us-type-filter-option" value="${o.id}" ${selectedTypeIds.has(Number(o.id)) ? 'checked' : ''}>
+                ${escHtml(filterLabel(o))}
+            </label>
+        `).join('');
+
+        return `
+            <div class="us-type-filter" id="us-type-filter" role="group" aria-label="Filter by lesson type">
+                <span class="us-type-filter-heading">Lesson type</span>
+                <div class="us-type-filter-choices">
+                    ${choices}
+                    ${filterActive() ? '<button type="button" id="us-type-filter-clear" class="us-type-filter-clear">Show all types</button>' : ''}
+                </div>
+            </div>`;
+    }
+
+    // Agenda-style calendar: available slots grouped by day.
+    function listHtml(slots) {
+        return groupByDay(slots).map(([key, daySlots]) => `
             <div class="us-day">
                 <h3 class="us-day-heading">${escHtml(dayLabel(key))}</h3>
                 ${daySlots.map((slot) => `
@@ -81,10 +213,124 @@
                 `).join('')}
             </div>
         `).join('');
+    }
 
-        slotList.querySelectorAll('.us-book-btn').forEach((btn) => {
-            const slot = slots.find((s) => String(s.id) === btn.dataset.slotId);
-            btn.addEventListener('click', () => openRegistration(slot));
+    // Weekly calendar: seven day columns with a bookable button per slot.
+    function weekHtml(slots) {
+        const byDay = new Map(groupByDay(slots));
+        const days  = [...Array(7).keys()].map((i) => addDays(weekStart, i));
+
+        const columns = days.map((key) => {
+            const daySlots = byDay.get(key) || [];
+            const buttons  = daySlots.map((slot) => `
+                <button data-slot-id="${slot.id}" class="us-book-btn us-week-slot" title="${escHtml(String(slot.duration_minutes))} min">
+                    ${escHtml(timeOf(slot.start_dt))}
+                </button>
+            `).join('');
+
+            return `
+                <div class="us-week-day">
+                    <h4 class="us-week-day-heading">${escHtml(shortDayLabel(key))}</h4>
+                    ${buttons || '<span class="us-week-empty" aria-hidden="true">—</span>'}
+                </div>`;
+        }).join('');
+
+        return `
+            <div class="us-week-nav">
+                <button type="button" id="us-week-prev">&lsaquo; Previous week</button>
+                <strong class="us-week-label">Week of ${escHtml(shortDayLabel(weekStart))}</strong>
+                <button type="button" id="us-week-next">Next week &rsaquo;</button>
+            </div>
+            <div class="us-week-grid">${columns}</div>`;
+    }
+
+    function render() {
+        const slots = visibleSlots();
+
+        // The pinned lesson type is no longer on offer (deactivated or
+        // deleted), so this page has nothing it is allowed to book.
+        if (pinnedTypeId && !catalog.length) {
+            slotList.innerHTML = '<p>This lesson type is not available for booking right now.</p>';
+            return;
+        }
+
+        // Nothing open at all: there is nothing for the controls to act on.
+        if (!allSlots.length) {
+            slotList.innerHTML = '<p>No available lesson slots at this time.</p>';
+            return;
+        }
+
+        if (!slots.length) {
+            const message = pinnedTypeId
+                ? '<p>No open times for this lesson type right now.</p>'
+                : '<p>No open times match the selected lesson types.</p>';
+
+            slotList.innerHTML = controlsHtml() + filterHtml() + message;
+            wireControlEvents();
+            return;
+        }
+
+        // Anchor the week view to the week of the earliest matching slot (the
+        // API returns slots ordered by start), so the first look is never empty.
+        if (view === 'week' && !weekStart) weekStart = weekStartOf(dayKey(slots[0].start_dt));
+
+        slotList.innerHTML = controlsHtml() + filterHtml() + (view === 'week' ? weekHtml(slots) : listHtml(slots));
+        wireControlEvents();
+        wireCalendarEvents();
+    }
+
+    function wireControlEvents() {
+        document.getElementById('us-view-list').addEventListener('click', () => {
+            view = 'list';
+            render();
+        });
+        document.getElementById('us-view-week').addEventListener('click', () => {
+            view = 'week';
+            render();
+        });
+
+        const toggle = document.getElementById('us-filter-toggle');
+        if (toggle) {
+            toggle.addEventListener('click', () => {
+                filterOpen = !filterOpen;
+                render();
+            });
+        }
+
+        slotList.querySelectorAll('.us-type-filter-option').forEach((input) => {
+            input.addEventListener('change', () => {
+                const id = Number(input.value);
+                if (input.checked) {
+                    selectedTypeIds.add(id);
+                } else {
+                    selectedTypeIds.delete(id);
+                }
+                // The nearest matching time may be weeks away, so re-anchor the
+                // week view instead of leaving the student on an empty week.
+                weekStart = null;
+                render();
+            });
+        });
+
+        const clear = document.getElementById('us-type-filter-clear');
+        if (clear) {
+            clear.addEventListener('click', () => {
+                selectedTypeIds.clear();
+                weekStart = null;
+                render();
+            });
+        }
+    }
+
+    function wireCalendarEvents() {
+        const prev = document.getElementById('us-week-prev');
+        const next = document.getElementById('us-week-next');
+        if (prev) prev.addEventListener('click', () => { weekStart = addDays(weekStart, -7); render(); });
+        if (next) next.addEventListener('click', () => { weekStart = addDays(weekStart, 7); render(); });
+
+        slotList.querySelectorAll('.us-book-btn[data-slot-id]').forEach((btn) => {
+            const slot = allSlots.find((s) => String(s.id) === btn.dataset.slotId);
+            if (slot) btn.addEventListener('click', () => openRegistration(slot));
         });
     }
 
@@ -114,23 +360,91 @@
             </div>`;
     }
 
+    // "Piano Lesson (60 min — 50.00 CAD at booking)" / "Trial Lesson (Free)"
+    function offeringLabel(o) {
+        const duration = o.duration_minutes ? `${o.duration_minutes} min — ` : '';
+        return `${o.title} (${duration}${window.usPricing.priceLabel(o)})`;
+    }
+
+    // How many lessons a weekly reservation can claim, mirroring
+    // BookingEndpoint::MAX_WEEKLY_OCCURRENCES so the quoted total is never
+    // higher than the server will actually charge for.
+    const MAX_WEEKLY_OCCURRENCES = 12;
+
+    // The open times a weekly reservation of this slot would claim: every
+    // still-unbooked slot of its recurring group, capped the way the server
+    // caps it. Some may be taken by another student first, so this is the
+    // upper bound on what will be booked, not a guarantee.
+    function weeklyOccurrences(slot) {
+        if (!slot.recurrence_group) return 1;
+
+        const inGroup = allSlots.filter((s) => s.recurrence_group === slot.recurrence_group).length;
+
+        return Math.min(Math.max(inGroup, 1), MAX_WEEKLY_OCCURRENCES);
+    }
+
     function openRegistration(slot) {
         clearError();
 
-        const offeringId = Number(slot.offering_id) || 0;
-        const qPath = offeringId ? `offerings/${offeringId}/questions` : null;
-
-        Promise.all([
-            qPath ? apiFetch(qPath) : Promise.resolve([]),
-            apiFetch('policies?scope=booking'),
-        ])
-            .then(([questions, policies]) => {
-                renderRegistration(slot, offeringId, questions, policies);
-            })
+        apiFetch('policies?scope=booking')
+            .then((policies) => renderRegistration(slot, policies))
             .catch((err) => showError(err.message));
     }
 
-    function renderRegistration(slot, offeringId, questions, policies) {
+    function offeringFieldHtml(tied, tiedId, choices) {
+        if (tiedId) {
+            // The slot is tied to one offering: show it locked so the student
+            // sees exactly what they are booking.
+            const label = tied ? offeringLabel(tied) : `Offering #${tiedId}`;
+            return `
+                <p class="us-offering">
+                    <label>Lesson type<br>
+                    <select id="us-offering" disabled><option>${escHtml(label)}</option></select></label>
+                </p>`;
+        }
+
+        // Only one type is left to book this slot as — usually because the
+        // filter narrowed it down — so it is chosen for the student.
+        if (choices.length === 1) {
+            return `
+                <p class="us-offering">
+                    <label>Lesson type<br>
+                    <select id="us-offering" required>
+                        <option value="${choices[0].id}" selected>${escHtml(offeringLabel(choices[0]))}</option>
+                    </select></label>
+                </p>`;
+        }
+
+        return `
+            <p class="us-offering">
+                <label>Lesson type<br>
+                <select id="us-offering" required>
+                    <option value="">— Choose a lesson type —</option>
+                    ${choices.map((o) => `<option value="${o.id}">${escHtml(offeringLabel(o))}</option>`).join('')}
+                </select></label>
+            </p>`;
+    }
+
+    function renderRegistration(slot, policies) {
+        const tiedId = Number(slot.offering_id) || 0;
+        const tied   = tiedId ? catalog.find((o) => Number(o.id) === tiedId) : null;
+
+        // Generic slots offer every lesson type that fits the slot — narrowed to
+        // the filtered types when the student has set a filter.
+        const choices = tiedId ? [] : slotChoices(slot);
+
+        if (!tiedId && !choices.length) {
+            // The server rejects offering-less bookings, so without a matching
+            // lesson type this time cannot be booked online.
+            slotList.innerHTML = `
+                <div class="us-register">
+                    <p>This time cannot be booked online right now. Please contact the instructor.</p>
+                    <p><button type="button" id="us-cancel" class="us-cancel-btn">Back</button></p>
+                </div>`;
+            document.getElementById('us-cancel').addEventListener('click', loadSlots);
+            return;
+        }
+
         const weekly = slot.recurrence_group
             ? `<p><label><input type="checkbox" id="us-weekly"> Reserve this time weekly for the term</label></p>`
             : '';
@@ -139,9 +453,11 @@
             <div class="us-register">
                 <h3>${escHtml(dayLabel(dayKey(slot.start_dt)))} · ${escHtml(timeOf(slot.start_dt))}–${escHtml(timeOf(slot.end_dt))}</h3>
                 <form id="us-register-form">
-                    ${questions.map(questionField).join('')}
+                    ${offeringFieldHtml(tied, tiedId, choices)}
+                    <div id="us-questions"></div>
                     ${policies.map(policyField).join('')}
                     ${weekly}
+                    <div id="us-price-summary"></div>
                     <p>
                         <button type="submit" class="us-book-btn">Confirm Booking</button>
                         <button type="button" id="us-cancel" class="us-cancel-btn">Back</button>
@@ -149,10 +465,73 @@
                 </form>
             </div>`;
 
+        // The intake questions belong to the selected offering, so they follow
+        // the picker instead of being fixed at render time. A tied slot — or a
+        // lone remaining type — is already decided, so its questions load
+        // straight away.
+        let selectedId = tiedId || (choices.length === 1 ? Number(choices[0].id) : 0);
+        let questions  = [];
+
+        const questionsBox = document.getElementById('us-questions');
+        const priceBox     = document.getElementById('us-price-summary');
+        const weeklyEl     = document.getElementById('us-weekly');
+
+        // What the booking will cost and the agreement to pay it, restated
+        // whenever the choices that decide the amount change: the lesson type
+        // carries the price, and a weekly reservation multiplies a per-lesson
+        // one-time price by every week it claims. A slot tied to a type the
+        // catalog no longer carries has no price to quote, so it shows nothing
+        // rather than a figure it cannot stand behind.
+        function renderPrice() {
+            const offering = selectedId ? catalog.find((o) => Number(o.id) === selectedId) : null;
+            priceBox.innerHTML = offering
+                ? window.usPricing.summaryHtml({
+                    price: offering.price,
+                    currency: offering.currency,
+                    billing_mode: offering.billing_mode,
+                    kind: offering.kind,
+                    occurrences: weeklyEl && weeklyEl.checked ? weeklyOccurrences(slot) : 1,
+                })
+                : '';
+        }
+
+        function loadQuestions() {
+            questions = [];
+            questionsBox.innerHTML = '';
+            if (!selectedId) return;
+            apiFetch(`offerings/${selectedId}/questions`)
+                .then((qs) => {
+                    questions = qs;
+                    questionsBox.innerHTML = qs.map(questionField).join('');
+                })
+                .catch((err) => showError(err.message));
+        }
+
+        if (!tiedId) {
+            document.getElementById('us-offering').addEventListener('change', (e) => {
+                selectedId = Number(e.target.value) || 0;
+                loadQuestions();
+                renderPrice();
+            });
+        }
+
+        if (weeklyEl) weeklyEl.addEventListener('change', renderPrice);
+
+        loadQuestions();
+        renderPrice();
+
         document.getElementById('us-cancel').addEventListener('click', loadSlots);
         document.getElementById('us-register-form').addEventListener('submit', (e) => {
             e.preventDefault();
-            submitBooking(e.target, slot, offeringId, questions);
+            if (!selectedId) {
+                showError('Please choose a lesson type.');
+                return;
+            }
+            if (!window.usPricing.agreed(e.target)) {
+                showError(window.usPricing.AGREE_REQUIRED);
+                return;
+            }
+            submitBooking(e.target, slot, selectedId, questions);
         });
     }
 
@@ -179,23 +558,142 @@
                 accepted_policy_version_ids: accepted,
             }),
         })
-            .then((res) => window.usPayment.collect('lesson', (res.ids || [])[0], slotList))
-            .then((result) => showConfirmation(window.usPayment.message(result)))
+            // A booking with nothing owed has no payment, so there is no payment
+            // step to run — the booking is already confirmed server-side.
+            .then((res) => (res.payment
+                ? window.usPayment.collect('lesson', (res.ids || [])[0], slotList)
+                : null))
+            .then((result) => {
+                loadMyLessons();
+                showConfirmation(window.usPayment.message(result));
+            })
             .catch((err) => showError(err.message));
     }
 
+    function lessonStatusLabel(status) {
+        if (status === 'pending') return 'Pending payment';
+        if (status === 'confirmed') return 'Confirmed';
+        return status.charAt(0).toUpperCase() + status.slice(1);
+    }
+
+    // How many upcoming lessons to show before the "Show all" reveal.
+    const INITIAL_LESSON_COUNT = 5;
+
+    function lessonRowHtml(l) {
+        const title    = l.offering_title ? escHtml(String(l.offering_title)) : 'Lesson';
+        const duration = l.duration_minutes ? ` <span class="us-my-lesson-duration">(${escHtml(String(l.duration_minutes))} min)</span>` : '';
+        // The two columns are divs, not spans: as spans the layout only held up
+        // while the stylesheet's display:flex won, and a theme rule on span
+        // collapsed the row onto itself.
+        return `
+            <div class="us-my-lesson">
+                <div class="us-my-lesson-info">
+                    <strong class="us-my-lesson-title">${title}${duration}</strong>
+                    <span class="us-my-lesson-when">${escHtml(dayLabel(dayKey(l.start_dt)))} · ${escHtml(timeOf(l.start_dt))}–${escHtml(timeOf(l.end_dt))}</span>
+                </div>
+                <div class="us-my-lesson-actions">
+                    <span class="us-lesson-status us-lesson-status-${escHtml(String(l.status))}">${escHtml(lessonStatusLabel(String(l.status)))}</span>
+                    <button type="button" class="us-cancel-lesson" data-lesson-id="${l.id}">Cancel</button>
+                </div>
+            </div>`;
+    }
+
+    function renderMyLessons(lessons) {
+        const upcoming = lessons.filter((l) => l.start_dt);
+        if (!upcoming.length) {
+            myLessons.innerHTML = '';
+            return;
+        }
+
+        // Show only the soonest few by default; the rest sit hidden behind a
+        // reveal so a busy student's list stays short.
+        const visible = upcoming.slice(0, INITIAL_LESSON_COUNT);
+        const hidden  = upcoming.slice(INITIAL_LESSON_COUNT);
+
+        myLessons.innerHTML = `
+            <div class="us-my-lessons">
+                <h3>Your upcoming lessons</h3>
+                ${visible.map(lessonRowHtml).join('')}
+                ${hidden.length ? `
+                    <div class="us-my-lessons-more" hidden>${hidden.map(lessonRowHtml).join('')}</div>
+                    <button type="button" class="us-show-all-lessons">Show all ${upcoming.length} lessons</button>
+                ` : ''}
+            </div>`;
+
+        const moreBox = myLessons.querySelector('.us-my-lessons-more');
+        const showAll = myLessons.querySelector('.us-show-all-lessons');
+        if (showAll && moreBox) {
+            showAll.addEventListener('click', () => {
+                moreBox.hidden = false;
+                showAll.remove();
+            });
+        }
+
+        myLessons.querySelectorAll('.us-cancel-lesson').forEach((btn) => {
+            btn.addEventListener('click', () => cancelLesson(Number(btn.dataset.lessonId)));
+        });
+    }
+
+    function cancelLesson(id) {
+        if (!window.confirm('Cancel this lesson? The time will be released for other students.')) {
+            return;
+        }
+        clearError();
+        apiFetch(`bookings/${id}/cancel`, { method: 'POST' })
+            .then(loadSlots)
+            .catch((err) => showError(err.message));
+    }
+
+    function loadMyLessons() {
+        if (!myLessons) return;
+        // The lesson list is a bonus panel: never let it break slot browsing.
+        apiFetch('bookings')
+            .then(renderMyLessons)
+            .catch(() => { myLessons.innerHTML = ''; });
+    }
+
     function showConfirmation(message) {
         confirm.textContent = message;
         slotList.style.display = 'none';
         confirm.style.display = 'block';
     }
 
+    // The private-lesson catalog drives both the filter and the registration
+    // form's lesson-type picker, and it does not change while the student
+    // browses — so it is fetched once and kept.
+    let catalogLoaded = false;
+
+    function loadCatalog() {
+        if (catalogLoaded) return Promise.resolve(catalog);
+        return apiFetch('offerings?kind=private_lesson').then((list) => {
+            // A pinned lesson type is the only one this page may book, so the
+            // catalog is narrowed to it and the filter is fixed on it. With a
+            // single type left the "Show Only" control hides itself.
+            catalog = pinnedTypeId
+                ? list.filter((o) => Number(o.id) === pinnedTypeId)
+                : list;
+
+            if (pinnedTypeId) selectedTypeIds.add(pinnedTypeId);
+
+            catalogLoaded = true;
+            return catalog;
+        });
+    }
+
     function loadSlots() {
         clearError();
+        loadMyLessons();
+
+        // An upcoming-lessons-only embed has no calendar to fill.
+        if (!slotList) return;
+
         slotList.style.display = 'block';
         confirm.style.display = 'none';
-        apiFetch('availability')
-            .then(renderSlots)
+        Promise.all([apiFetch('availability'), loadCatalog()])
+            .then(([slots]) => {
+                allSlots = slots;
+                render();
+            })
             .catch((err) => showError(err.message));
     }
 

assets/js/group-classes.js

@@ -10,6 +10,13 @@
     const errorBox = document.getElementById('us-group-error');
     const { restUrl, nonce } = usScheduler;
 
+    // When the shortcode/block pins a single offering, only that class is
+    // shown, so the page can be embedded alongside a full class description.
+    // The class's own description is then omitted from the card — the page it
+    // sits on already describes the class — leaving the schedule, price and
+    // enrolment controls.
+    const singleOfferingId = Number(app.dataset.offering || 0);
+
     function apiFetch(path, options = {}) {
         return fetch(restUrl + path, {
             ...options,
@@ -68,20 +75,95 @@
             </div>`;
     }
 
-    function renderClasses(offerings) {
-        const groups = offerings.filter((o) => o.kind === 'group_class');
+    // Parse a Y-m-d date into local time; new Date('Y-m-d') would parse as
+    // UTC midnight and can display as the previous day in western timezones.
+    function formatDate(ymd) {
+        const [y, m, d] = ymd.split('-').map(Number);
+        return new Date(y, m - 1, d).toLocaleDateString(undefined, { year: 'numeric', month: 'short', day: 'numeric' });
+    }
+
+    function termLabel(o) {
+        if (!o.term_start) return '';
+        if (!o.term_end || o.term_end === o.term_start) {
+            return formatDate(o.term_start);
+        }
+        const weekMs = 7 * 24 * 60 * 60 * 1000;
+        const sessions = Math.round((new Date(o.term_end) - new Date(o.term_start)) / weekMs) + 1;
+        return `${formatDate(o.term_start)} – ${formatDate(o.term_end)} (${sessions} weekly sessions)`;
+    }
+
+    // Format a stored H:i(:s) class time as a friendly local-clock label.
+    function timeLabel(o) {
+        if (!o.class_time) return '';
+        const [h, m] = o.class_time.split(':').map(Number);
+        const d = new Date();
+        d.setHours(h, m, 0, 0);
+        return d.toLocaleTimeString(undefined, { hour: 'numeric', minute: '2-digit' });
+    }
+
+    // The "when" line combines the date (or date range) with the class time.
+    function whenLabel(o) {
+        return [termLabel(o), timeLabel(o)].filter(Boolean).join(' · ');
+    }
+
+    // Today as a Y-m-d string in the visitor's local timezone, for lexicographic
+    // comparison against the class's Y-m-d enrolment deadline.
+    function todayYmd() {
+        const now = new Date();
+        return `${now.getFullYear()}-${String(now.getMonth() + 1).padStart(2, '0')}-${String(now.getDate()).padStart(2, '0')}`;
+    }
+
+    // The effective enrolment deadline: the instructor's set deadline, or the
+    // first class day by default. Empty when the class has no dates at all.
+    function enrolmentDeadline(o) {
+        return o.enrollment_deadline || o.term_start || '';
+    }
+
+    // Enrolment closes at the end of the deadline day. Mirrors the server-side
+    // Offering::isEnrollmentOpen() gate.
+    function isEnrollmentOpen(o) {
+        const deadline = enrolmentDeadline(o);
+        return !deadline || todayYmd() <= deadline;
+    }
+
+    // Self-withdrawal closes at the end of the withdrawal-deadline day. Unlike
+    // enrolment there is no implicit default: an unset deadline keeps withdrawal
+    // open. Mirrors the server-side Offering::isWithdrawalOpen() gate.
+    function isWithdrawalOpen(o) {
+        return !o.withdrawal_deadline || todayYmd() <= o.withdrawal_deadline;
+    }
+
+    function renderClasses(offerings, enrolledMap) {
+        let groups = offerings.filter((o) => o.kind === 'group_class');
+        if (singleOfferingId) {
+            groups = groups.filter((o) => Number(o.id) === singleOfferingId);
+        }
         if (!groups.length) {
-            list.innerHTML = '<p>No group classes are open for enrolment right now.</p>';
+            list.innerHTML = singleOfferingId
+                ? '<p>This class is not open for enrolment right now.</p>'
+                : '<p>No group classes are open for enrolment right now.</p>';
             return;
         }
 
         list.innerHTML = groups.map((o) => `
             <div class="us-class">
                 <h3>${escHtml(o.title)}</h3>
+                ${whenLabel(o) ? `<p class="us-class-when">${escHtml(whenLabel(o))}</p>` : ''}
+                ${o.instructor_name ? `<p class="us-class-instructor">With ${escHtml(o.instructor_name)}</p>` : ''}
                 ${o.schedule_note ? `<p>${escHtml(o.schedule_note)}</p>` : ''}
-                ${o.description ? `<p>${escHtml(o.description)}</p>` : ''}
-                <p>${escHtml(Number(o.price).toFixed(2))} ${escHtml(o.currency)}</p>
-                <button data-offering-id="${o.id}" class="us-enrol-btn">Enrol</button>
+                ${!singleOfferingId && o.description ? `<p>${escHtml(o.description)}</p>` : ''}
+                <p class="us-class-price">${escHtml(window.usPricing.priceLabel(o))}</p>
+                ${!enrolledMap.has(Number(o.id)) && isEnrollmentOpen(o) && enrolmentDeadline(o)
+        ? `<p class="us-enrol-deadline">Enrol by ${escHtml(formatDate(enrolmentDeadline(o)))}</p>`
+        : ''}
+                ${enrolledMap.has(Number(o.id))
+        ? `<p class="us-enrolled"><strong>You are enrolled in this class.</strong></p>
+                ${isWithdrawalOpen(o)
+            ? `<button data-enrollment-id="${enrolledMap.get(Number(o.id))}" class="us-withdraw-btn">Withdraw</button>`
+            : '<p class="us-withdraw-closed">Withdrawal has closed — contact the studio to withdraw.</p>'}`
+        : (isEnrollmentOpen(o)
+            ? `<button data-offering-id="${o.id}" class="us-enrol-btn">Enrol</button>`
+            : '<p class="us-enrol-closed"><strong>Enrolment has closed.</strong></p>')}
             </div>
         `).join('');
 
@@ -89,6 +171,20 @@
             const offering = groups.find((o) => String(o.id) === btn.dataset.offeringId);
             btn.addEventListener('click', () => openEnrolment(offering));
         });
+
+        list.querySelectorAll('.us-withdraw-btn').forEach((btn) => {
+            btn.addEventListener('click', () => withdraw(btn.dataset.enrollmentId));
+        });
+    }
+
+    function withdraw(enrollmentId) {
+        clearError();
+        if (!window.confirm('Withdraw from this class? Your seat is released and any pending payment is cancelled.')) {
+            return;
+        }
+        apiFetch(`enrollments/${enrollmentId}/withdraw`, { method: 'POST' })
+            .then(loadClasses)
+            .catch((err) => showError(err.message));
     }
 
     function openEnrolment(offering) {
@@ -108,6 +204,7 @@
                 <form id="us-enrol-form">
                     ${questions.map(questionField).join('')}
                     ${policies.map(policyField).join('')}
+                    ${window.usPricing.summaryHtml(offering)}
                     <p>
                         <button type="submit" class="us-enrol-btn">Confirm Enrolment</button>
                         <button type="button" id="us-group-cancel" class="us-cancel-btn">Back</button>
@@ -118,6 +215,10 @@
         document.getElementById('us-group-cancel').addEventListener('click', loadClasses);
         document.getElementById('us-enrol-form').addEventListener('submit', (e) => {
             e.preventDefault();
+            if (!window.usPricing.agreed(e.target)) {
+                showError(window.usPricing.AGREE_REQUIRED);
+                return;
+            }
             submitEnrolment(e.target, offering, questions);
         });
     }
@@ -142,7 +243,11 @@
                 accepted_policy_version_ids: accepted,
             }),
         })
-            .then((res) => window.usPayment.collect('enrollment', res.id, list))
+            // An enrolment with nothing owed has no payment, so there is no
+            // payment step to run.
+            .then((res) => (res.payment
+                ? window.usPayment.collect('enrollment', res.id, list)
+                : null))
             .then((result) => showConfirmation(window.usPayment.message(result)))
             .catch((err) => showError(err.message));
     }
@@ -157,8 +262,20 @@
         clearError();
         list.style.display = 'block';
         confirm.style.display = 'none';
-        apiFetch('offerings?kind=group_class')
-            .then(renderClasses)
+        // The student's own enrolments are fetched alongside the catalog so a
+        // class they already have an active enrolment in shows its status
+        // instead of offering to enrol them again (the API would reject the
+        // duplicate anyway). A cancelled enrolment does not block re-enrolling.
+        Promise.all([
+            apiFetch('offerings?kind=group_class'),
+            apiFetch('enrollments'),
+        ])
+            .then(([offerings, enrollments]) => renderClasses(
+                offerings,
+                new Map(enrollments
+                    .filter((e) => e.status === 'active')
+                    .map((e) => [Number(e.offering_id), e.id]))
+            ))
             .catch((err) => showError(err.message));
     }
 

assets/js/pricing.js

@@ -0,0 +1,170 @@
+/* global usScheduler */
+(function () {
+    'use strict';
+
+    // Cadence wording for each offering billing mode, in the phrasing a student
+    // sees beside a price. Mirrors Offering::VALID_BILLING_MODES.
+    const CADENCE = {
+        one_time: 'at booking',
+        full_term: 'up front',
+        weekly: 'weekly',
+        monthly: 'monthly',
+    };
+
+    // How each cadence is actually collected, spelled out beneath the price so
+    // the one-word cadence is never the only thing a student has to go on.
+    const CADENCE_NOTE = {
+        one_time: 'Charged once, when you book.',
+        full_term: 'Charged once, up front, for the whole term.',
+        weekly: 'Charged for each lesson, 24 hours before it starts.',
+        monthly: 'Charged on the 1st of each month, for that month’s lessons.',
+    };
+
+    // The billing modes whose price is a per-lesson fee billed again and again,
+    // rather than a single charge. Mirrors Offering::SCHEDULED_BILLING_MODES.
+    const RECURRING = ['weekly', 'monthly'];
+
+    function escHtml(str) {
+        return String(str)
+            .replace(/&/g, '&')
+            .replace(/</g, '&lt;')
+            .replace(/>/g, '&gt;')
+            .replace(/"/g, '&quot;');
+    }
+
+    function mode(billingMode) {
+        return CADENCE[billingMode] ? billingMode : 'one_time';
+    }
+
+    // A monthly charge rolls up every lesson that falls in the month, so a
+    // private lesson's monthly price is quoted *per lesson* — the fee is
+    // multiplied by the lessons booked that month. A group class is enrolled in
+    // once, as one schedule, so its monthly figure is quoted as it stands.
+    function isPerLessonMonthly(billingMode, kind) {
+        return 'monthly' === billingMode && 'group_class' !== kind;
+    }
+
+    // "50.00 CAD" — amount then currency code, the format used throughout the
+    // ledger, receipts and payment notices.
+    function money(amount, currency) {
+        return `${(Number(amount) || 0).toFixed(2)} ${String(currency || '')}`.trim();
+    }
+
+    // The studio's HST rate as a percentage, frozen onto every payment at
+    // booking time (comped students are the one exception — they are not taxed).
+    function taxRate() {
+        return Number(usScheduler.taxRate) || 0;
+    }
+
+    // Tax on a pre-tax amount, rounded the same way PaymentService does.
+    function tax(amount) {
+        return Math.round((Number(amount) || 0) * taxRate()) / 100;
+    }
+
+    function total(amount) {
+        return (Number(amount) || 0) + tax(amount);
+    }
+
+    // "50.00 CAD at booking" / "50.00 CAD per lesson monthly" / "Free" — the
+    // catalogue label, always carrying the cadence so a price is never shown
+    // without saying when it is due.
+    function priceLabel(offering) {
+        const price = Number(offering.price) || 0;
+        if (price <= 0) {
+            return 'Free';
+        }
+
+        const billingMode = mode(offering.billing_mode);
+        const perLesson   = isPerLessonMonthly(billingMode, offering.kind) ? 'per lesson ' : '';
+
+        return `${money(price, offering.currency)} ${perLesson}${CADENCE[billingMode]}`;
+    }
+
+    // The price block shown on a booking/enrolment form, followed by the
+    // agreement the student must tick to confirm they will pay it. A free
+    // offering has nothing to agree to, so it renders nothing at all.
+    //
+    // opts: { price, currency, billing_mode, kind, occurrences }
+    // `occurrences` is how many lessons a one-time price is charged for in this
+    // one registration (a weekly reservation claims several at once); it is
+    // ignored for the other modes, whose price is charged per period regardless.
+    function summaryHtml(opts) {
+        const price = Number(opts.price) || 0;
+        if (price <= 0) {
+            return '';
+        }
+
+        const billingMode = mode(opts.billing_mode);
+        const currency    = opts.currency;
+        const each        = total(price);
+        const count       = 'one_time' === billingMode ? Math.max(1, Number(opts.occurrences) || 1) : 1;
+
+        const taxLine = taxRate() > 0
+            ? `<p class="us-price-tax">${escHtml(`Plus ${taxRate()}% HST — ${money(each, currency)}${count > 1 ? ' per lesson' : ''}.`)}</p>`
+            : '';
+
+        return `
+            <div class="us-price">
+                <h4>Price</h4>
+                <p class="us-price-amount">
+                    <strong>${escHtml(money(price, currency))}</strong>
+                    <span class="us-price-cadence">${escHtml(cadenceLabel(billingMode, opts.kind))}</span>
+                </p>
+                ${taxLine}
+                <p class="us-price-note">${escHtml(count > 1
+                    ? 'Charged once, when you book — for every week reserved.'
+                    : CADENCE_NOTE[billingMode])}</p>
+                <label class="us-price-agree">
+                    <input type="checkbox" class="us-price-accept" required>
+                    ${escHtml(agreeText(each, currency, billingMode, count, opts.kind))}
+                </label>
+            </div>`;
+    }
+
+    // The cadence as it reads beside an amount: a private lesson billed monthly
+    // adds "per lesson", since the month's charge is that fee times the lessons
+    // it covers.
+    function cadenceLabel(billingMode, kind) {
+        return isPerLessonMonthly(billingMode, kind)
+            ? `per lesson ${CADENCE[billingMode]}`
+            : CADENCE[billingMode];
+    }
+
+    // What the student is ticking: the amount actually billed (tax included),
+    // and when. A weekly reservation is charged per lesson for every week it
+    // claims, and the claim can come up short when another student takes one of
+    // the times first — so its total is stated as a ceiling, never a promise.
+    function agreeText(each, currency, billingMode, count, kind) {
+        if (RECURRING.indexOf(billingMode) !== -1) {
+            // A monthly group class is enrolled in once and quoted as it stands;
+            // everything else recurring is a per-lesson fee.
+            return 'monthly' === billingMode && !isPerLessonMonthly(billingMode, kind)
+                ? `I agree to pay ${money(each, currency)} monthly.`
+                : `I agree to pay ${money(each, currency)} per lesson, billed ${CADENCE[billingMode]}.`;
+        }
+
+        if (count > 1) {
+            return `I agree to pay ${money(each, currency)} per lesson at booking — `
+                + `up to ${count} lessons, ${money(each * count, currency)} in total.`;
+        }
+
+        return `I agree to pay ${money(each, currency)} ${CADENCE[billingMode]}.`;
+    }
+
+    // Whether the payment agreement has been ticked. A form without one (a free
+    // offering) has nothing outstanding, so it counts as agreed.
+    function agreed(root) {
+        const box = root.querySelector('.us-price-accept');
+
+        return !box || box.checked;
+    }
+
+    // Shared by the booking and group-class flows so a price reads the same
+    // wherever a student meets it.
+    window.usPricing = {
+        priceLabel,
+        summaryHtml,
+        agreed,
+        AGREE_REQUIRED: 'Please confirm you agree to pay the amount shown.',
+    };
+}());

assets/js/register.js

@@ -0,0 +1,57 @@
+/**
+ * Progressive enhancement for the two-step student registration form.
+ *
+ * When account-signup questions are configured the form renders two panels
+ * (`[data-step="1"]` account details, `[data-step="2"]` the questions) inside a
+ * single form marked `data-steps="1"`. This script hides step two behind a
+ * "Next" button that only advances once step one passes native validation.
+ * Without JS both panels stay visible and the single submit still works.
+ */
+(function () {
+	'use strict';
+
+	function enhance(form) {
+		var step1 = form.querySelector('[data-step="1"]');
+		var step2 = form.querySelector('[data-step="2"]');
+		var next = form.querySelector('.us-reg-next');
+		var back = form.querySelector('.us-reg-back');
+
+		if (!step1 || !step2 || !next) {
+			return;
+		}
+
+		function show(step) {
+			step1.hidden = step !== 1;
+			step2.hidden = step !== 2;
+		}
+
+		show(1);
+
+		next.addEventListener('click', function () {
+			var fields = step1.querySelectorAll('input, select, textarea');
+
+			for (var i = 0; i < fields.length; i++) {
+				if (!fields[i].checkValidity()) {
+					fields[i].reportValidity();
+					return;
+				}
+			}
+
+			show(2);
+		});
+
+		if (back) {
+			back.addEventListener('click', function () {
+				show(1);
+			});
+		}
+	}
+
+	document.addEventListener('DOMContentLoaded', function () {
+		var forms = document.querySelectorAll('.us-register-form form[data-steps="1"]');
+
+		for (var i = 0; i < forms.length; i++) {
+			enhance(forms[i]);
+		}
+	});
+})();

composer.json

@@ -11,8 +11,8 @@
         "phpunit/phpunit": "^10.5",
         "brain/monkey": "^2.6",
         "mockery/mockery": "^1.6",
-        "phpstan/phpstan": "^1.10",
-        "szepeviktor/phpstan-wordpress": "^1.3",
+        "phpstan/phpstan": "^2.0",
+        "szepeviktor/phpstan-wordpress": "^2.0",
         "php-stubs/wordpress-stubs": "^6.0",
         "squizlabs/php_codesniffer": "^3.7",
         "wp-coding-standards/wpcs": "^3.0"
@@ -30,7 +30,7 @@
     "scripts": {
         "test": "phpunit --configuration phpunit.xml",
         "test:coverage": "phpunit --configuration phpunit.xml --coverage-html coverage/",
-        "lint": "phpstan analyse src/ --level=6 --configuration phpstan.neon --memory-limit=1G",
+        "lint": "phpstan analyse --configuration phpstan.neon --memory-limit=1G",
         "cs": "phpcs --standard=phpcs.xml.dist",
         "cs:fix": "phpcbf --standard=phpcs.xml.dist",
         "build": "bash bin/build-zip.sh"

docs/features/account-registration.md

@@ -4,27 +4,87 @@
 People register for a student account through a front-end page, accepting any
 signup-scoped policies at that time. Registration is **invite-only** by default: a
 studio admin sends an invite, and the invitee completes signup via a tokenised
-link. A settings seam (`us_registration_mode`) allows switching to open
-self-registration with approval later.
+link. A studio can instead switch on **open (self-approval) registration**, where
+anyone may sign up, confirm their email, and then be approved by a studio admin
+before the account can be used. Both modes coexist — invites keep working when
+open registration is on.
+
+A studio admin can also generate a **group invite link** — a multi-use, tokenised
+link with an explicit expiry date (e.g. for a newsletter). Anyone with the link
+may register while it is valid, regardless of the registration mode: they supply
+their own email, must confirm it, and are then **approved automatically** —
+group-link signups never enter the Pending Students queue.
 
 ## Registration Modes
-Stored in the `us_registration_mode` option (default `invite`):
-- `invite` — only a valid, pending invite token grants access to the registration form. *(implemented)*
-- `self_approval` — anyone may register; the account is created in a pending state until a studio admin approves it. *(reserved for a later iteration)*
+Stored in the `us_registration_mode` option (default `invite`), toggled from
+**Studio Settings → Registration**:
+- `invite` — only a valid, pending invite token grants access to the registration form.
+- `self_approval` — anyone may register on the registration page; each account is created in a pending state, must confirm its email, and is then approved (or rejected) by a studio admin.
+
+### Enabling open registration
+The Studio Settings toggle is the source of truth. Enabling it mirrors into the
+two core WordPress options the flow relies on, and **snapshots** their previous
+values (`us_registration_prev_can_register`, `us_registration_prev_default_role`):
+- `users_can_register` → `1` (Settings → General "Anyone can register")
+- `default_role` → `us_student`
+
+Disabling restores the snapshot, so the toggle never permanently overwrites a
+site's own membership settings. Only enable/disable *transitions* touch the core
+options — saving unrelated settings leaves them alone.
+See `Payment\StudioSettings::applyRegistrationMode()`.
+
+### Blocking the native registration form
+Because `users_can_register=1` also switches on WordPress's own
+`wp-login.php?action=register` form — which cannot collect the required signup
+policy acceptances — that form is blocked while open registration is on, so it can
+never be used to create a policy-less account (`Auth\EmailConfirmationHandler`):
+- `register_url` filter points WordPress's "Register" links at the registration page.
+- `login_init` action redirects any `action=register` request (GET **and** POST) to the registration page before any processing runs.
+- `registration_errors` filter is a fail-safe that rejects `register_new_user()` outright.
+
+## Account Lifecycle (self-approval)
+State lives entirely in user meta (`Auth\RegistrationStatus`). Only the raw
+confirmation token's SHA-256 hash is stored; the token expires after 48h
+(`EMAIL_CONFIRM_EXPIRY_HOURS`).
+
+| State | User meta | Login | Booking |
+|---|---|---|---|
+| Email unconfirmed | `us_awaiting_approval=1`, `us_email_confirm_token`(hash) + `us_email_confirm_expires` set | blocked ("confirm your email") | — |
+| Confirmed, awaiting approval | `us_awaiting_approval=1`, `us_email_confirmed=1`, token/expiry cleared | allowed | withheld → pending screen |
+| Approved / active | `us_awaiting_approval` deleted, `us_email_confirmed=1` | allowed | full student |
+| Rejected | account hard-deleted (`wp_delete_user`) | n/a | n/a |
+| Invite/admin-created student | none of these metas | allowed | full student |
+
+- **Login gate** (`Auth\RegistrationLoginGate`): the `wp_authenticate_user` filter blocks login while the email is unconfirmed; the `user_has_cap` filter withholds `book_lesson` while `us_awaiting_approval` is set, so a confirmed-but-unapproved student only reaches the "awaiting approval" screen on the booking page.
+- **Email confirmation** (`Auth\EmailConfirmationHandler` on `template_redirect`): opening the emailed `?us_confirm=<token>` link confirms the email, notifies the studio admins, and redirects back to the registration page with `?us_confirmed=1` (or `expired`). On `?us_confirmed=1` the registration page replaces the form with the confirmation message plus a "Sign in to your account" link — the configured sign-in page (block `loginPageId` / shortcode `login_page_id` attribute), falling back to the WordPress login screen. The `expired` notice keeps the form.
+- **Approval** (`Auth\RegistrationApprovalController`, **Students → Pending Students**, `manage_students`): approve clears the pending flags and emails the student; reject emails them and hard-deletes the account so the email is freed to re-apply.
+- **Emails**: `Auth\RegistrationMailer` sends the confirmation link, the admin heads-up, and the approval/rejection notices.
 
 ## Data Model — `{prefix}us_invites`
 
 | Column             | Type             | Notes                                                  |
 |--------------------|------------------|--------------------------------------------------------|
 | `id`               | BIGINT UNSIGNED  | Primary key                                            |
-| `email`            | VARCHAR(191)     | Invited email address                                  |
-| `token`            | VARCHAR(64)      | Opaque token embedded in the registration link         |
+| `email`            | VARCHAR(191)     | Invited email address; empty string for group links     |
+| `token`            | VARCHAR(64)      | SHA-256 hash of the token embedded in the registration link (raw token is never stored) |
 | `role`             | VARCHAR(32)      | Role granted on acceptance (default `us_student`)       |
-| `status`           | VARCHAR(20)      | `pending` / `accepted` / `revoked`                     |
+| `kind`             | VARCHAR(10)      | `personal` (single-use, per email) or `group` (multi-use link) |
+| `offering_id`      | BIGINT UNSIGNED  | Set when a personal invite is tied to an invite-only group class (see `group-classes.md`); NULL otherwise |
+| `status`           | VARCHAR(20)      | `pending` / `accepted` / `revoked` (group links stay `pending` until revoked/expired) |
 | `invited_by`       | BIGINT UNSIGNED  | WordPress user ID of the studio admin who invited       |
-| `accepted_user_id` | BIGINT UNSIGNED  | The created user's ID once accepted; NULL while pending  |
+| `accepted_user_id` | BIGINT UNSIGNED  | The created user's ID once accepted; NULL while pending / for group links |
 | `created_at`       | DATETIME         | Insertion time                                         |
-| `accepted_at`      | DATETIME         | When accepted; NULL while pending                      |
+| `accepted_at`      | DATETIME         | When accepted; NULL while pending / for group links     |
+| `expires_at`       | DATETIME         | Explicit expiry (end of the chosen day); set on every group link, NULL for personal invites (which expire 14 days after creation) |
+
+## Registration Questions (signup step two)
+When the studio has configured **account-scope** registration questions
+(**Offerings → Questions → "Account signup"**, see `registration-questions.md`), the
+registration form becomes two steps: name/email/password/policies first, then the required
+questions. This applies to **every** signup path (invite, group link, self-approval).
+Required answers are validated before the account is created, and are stored against the new
+user (`us_question_answers`, `registration_type = 'account'`). A studio admin reviews them
+under **Registration Information** on the student's admin screen.
 
 ## Policy Acceptance Scope
 Policies declare **when** they must be accepted via `us_policies.acceptance_scope`:
@@ -34,19 +94,46 @@ recorded in `us_policy_acceptances` with `registration_type = account` and
 `registration_id = <new user ID>`.
 
 ## Flow (invite mode)
-1. Studio admin opens **Invites** (`manage_students`) and invites an email; an invite row is created with a token and a registration link.
-2. The invitee opens `[us_student_register]` with the token (`?us_invite=<token>`).
-3. The form pre-fills the email and collects a display name and password, and renders the signup-scoped published policies, each with a required acceptance checkbox.
-4. On submit, the token is re-validated; a `us_student` user is created, the policy acceptances are recorded (`account` type), the invite is marked `accepted`, and the user is logged in.
+1. Studio admin opens **Invites** (`manage_students`) and invites an email; an invite row is created storing the token's SHA-256 hash, and the registration link (with the raw token) is shown **once** in a notice. To re-send a lost link, revoke and re-invite.
+2. The invitee opens `[us_student_register]` with the token (`?us_invite=<token>`); the lookup hashes the submitted token and matches it against the stored hash.
+3. The form shows the invited email **pre-filled and read-only** (the server always uses the invite's address on submit, so a tampered value is ignored) and collects a display name and password, and renders the signup-scoped published policies, each with a required acceptance checkbox. A token that is no longer redeemable (expired / accepted / revoked) renders the normal editable email field instead when open registration is on.
+4. On submit, the token is re-validated (hashed lookup); a `us_student` user is created, the policy acceptances are recorded (`account` type), the invite is marked `accepted`, and the user is logged in. The submission is processed on `template_redirect` (`RegistrationPage::maybeHandleSubmit()`) **before** any page output so `wp_set_auth_cookie()` actually persists — it then post/redirect/gets back to the page with `?us_registered=invite`, where the now-logged-in student sees the "created and logged in" confirmation. (Processing the form inside `render()`, which runs during `the_content`, sent the cookie after headers and left the student logged out on the next view.) If the invite carries an `offering_id` (a group-class email invite), the new account is linked to the matching access grant so the invite-only class becomes enrollable for them — see `group-classes.md`.
+
+## Flow (self-approval mode)
+1. Studio admin enables **Studio Settings → Registration** and selects the registration page (shared with invites, `us_registration_page_id`).
+2. Anyone opens `[us_student_register]`; the form collects an editable email, display name, password, and the required signup policies.
+3. On submit a `us_student` user is created in the pending state (`RegistrationStatus::markPending()`), acceptances are recorded (`account` type), a confirmation email is sent, and the user is **not** logged in.
+4. The applicant opens the emailed `?us_confirm=<token>` link → email confirmed, studio admins notified.
+5. Studio admin approves under **Students → Pending Students** → pending flags cleared, student emailed; they can now log in and book. Rejection deletes the account.
+
+## Flow (group invite link)
+1. Studio admin opens **Invites** and generates a **group link**, choosing the expiry date (required; the link stops working at the end of that day). The link is shown **once**, like personal invite links.
+2. Anyone opens the link while it is pending and unexpired — in **any** registration mode — and the form collects an **editable email**, display name, password, and the signup policies.
+3. On submit the account is created pending with the auto-approve marker (`RegistrationStatus::markPending($userId, autoApprove: true)`, meta `us_auto_approve`) and a confirmation email is sent. The invite row is **not** marked accepted — the link remains usable by others.
+4. Opening the `?us_confirm=<token>` link confirms the email and **approves the account immediately** (`EmailConfirmationHandler`): no admin heads-up, no Pending Students entry; the student gets the "approved" email and the page shows a "ready to use" notice (`?us_confirmed=ready`) with a sign-in link.
+5. The link can be revoked at any time from the Invites page.
 
 ## Admin Interface
 **Invites** in wp-admin (`manage_students`, studio admin only):
 - Select the **registration page** (the page hosting `[us_student_register]`), stored in the `us_registration_page_id` option; invitation links point there (falling back to the home page if unset)
-- Invite an email (creates a pending invite + link)
-- List pending invites; revoke an invite
+- Invite an email (creates a pending invite; the link is displayed once, at creation only)
+- Generate a **group invite link** with a required expiry date (link displayed once)
+- List pending invites (email or "Group link", created + expiry dates); revoke an invite
+
+**Pending Students** — submenu under Students (`manage_students`), only relevant in `self_approval` mode:
+- "Awaiting approval" (email confirmed) — approve or reject
+- "Awaiting email confirmation" (not yet confirmed) — reject only
 
 ## Frontend Shortcode
-- `[us_student_register]` — the registration page. Shows the form for a valid pending invite; otherwise shows an "by invitation only" message (in `invite` mode).
+- `[us_student_register]` — the registration page. In `invite` mode: shows the form for a valid pending invite, else an "by invitation only" message. In `self_approval` mode: shows the form to anyone (editable email), and renders confirmation-result notices from `?us_confirmed=1|expired`.
+- The invitation-only message is customisable: block attribute `inviteOnlyMessage` (set under the block's **Invitation-only notice** panel) / shortcode attribute `invite_only_message`. Blank falls back to the default wording (`RegistrationPage::inviteOnlyMessage()`).
+
+## Where Students Go Next
+The block's **After registration** panel picks the page a student continues to once
+registration finishes, and whether they get there by hand or automatically.
+
+- **Sign-in page** (`loginPageId` / `login_page_id`) — the target of the "Sign in to your account" link shown after email confirmation (`?us_confirmed=1|ready`, falling back to the WordPress login screen) and of the **"Continue to _&lt;page title&gt;_"** link every **logged-in** visitor gets (`RegistrationPage::continueLink()`): an invited student who just finished signing up (`?us_registered=invite`), and anyone who simply arrives at the registration page already signed in. The link names the chosen page (via `get_the_title()`) so the visitor knows where it goes; an untitled page falls back to "Continue to your account" rather than reading "Continue to ". Neither gets the WordPress-login-screen fallback — with no page chosen there is no link at all, since sending someone already signed in to the login screen is the same dead end with extra steps.
+- **Redirect automatically** (`autoRedirect`, block only) — sends the student to that page instead of showing the link, via `BlockRegistrar::maybeAutoRedirect()` on `template_redirect`. It fires only on those two finished states (`RegistrationPage::isRegistrationComplete()`), so the "check your email" step, a validation error, and an `expired` confirmation link are always shown rather than redirected past. With no page chosen nothing happens — there is deliberately no login-screen fallback for the redirect. See `editor-blocks.md`.
 
 ## Token Redirect
 A `template_redirect` handler (`RegistrationPage::maybeRedirectToRegistrationPage()`)
@@ -56,16 +143,25 @@ covers invitation links generated/shared before a registration page was selected
 No-op when no registration page is set.
 
 ## Capabilities
-- `manage_students` — manage invites (studio admin; administrators inherit it via the `user_has_cap` filter). Added to `RoleManager::STUDIO_ADMIN_CAPS`.
+- `manage_students` — manage invites and approve/reject pending students (studio admin; administrators inherit it via the `user_has_cap` filter). Added to `RoleManager::STUDIO_ADMIN_CAPS`.
 
 ## Implementation
 - Models: `Unsupervised\Schedular\Auth\Invite`
 - Repository: `Unsupervised\Schedular\Auth\InviteRepository`
-- Admin controller: `Unsupervised\Schedular\Auth\RegistrationController`
+- Admin controllers: `Unsupervised\Schedular\Auth\RegistrationController` (invites), `Unsupervised\Schedular\Auth\RegistrationApprovalController` (pending students)
 - Frontend: `Unsupervised\Schedular\Auth\RegistrationPage`
+- Self-approval flow: `Auth\RegistrationStatus` (lifecycle meta), `Auth\RegistrationLoginGate` (login + booking-cap gate), `Auth\EmailConfirmationHandler` (confirm link + native-form block), `Auth\RegistrationMailer` (emails)
+- Settings toggle: `Payment\StudioSettings` (`us_registration_mode`, core-option mirror/restore)
 - Reuses `Policy\PolicyRepository`, `Policy\PolicyVersionRepository`, `Policy\AcceptanceRepository`
-- Schema: `us_invites`; `us_policies.acceptance_scope`
+- Schema: `us_invites`; `us_policies.acceptance_scope`. Self-approval adds no tables — state is WordPress user meta.
 
 ## Tests
 - `tests/Unit/Auth/InviteTest.php`
 - `tests/Unit/Auth/InviteRepositoryTest.php`
+- `tests/Unit/Auth/RegistrationStatusTest.php`
+- `tests/Unit/Auth/RegistrationLoginGateTest.php`
+- `tests/Unit/Auth/EmailConfirmationHandlerTest.php`
+- `tests/Unit/Auth/RegistrationPageTest.php`
+- `tests/Unit/Auth/RegistrationApprovalControllerTest.php`
+- `tests/Unit/Auth/RegistrationMailerTest.php`
+- `tests/Unit/Payment/StudioSettingsTest.php`

docs/features/availability-management.md

@@ -1,7 +1,7 @@
 # Feature: Availability Management
 
 ## Overview
-Instructors define date/time windows during which they are available for private lessons. Students book from these windows. Windows carry a lesson length and may be generated as a weekly-recurring series.
+Instructors define same-day date/time windows during which they are available for private lessons. On save, a window is split into consecutive lesson-length slots (09:00–16:00 with 60-minute lessons becomes seven rows), each independently bookable by students. Windows may be generated as a weekly-recurring series.
 
 ## Data Model — `{prefix}us_availability`
 
@@ -11,31 +11,68 @@ Instructors define date/time windows during which they are available for private
 | `instructor_id`    | BIGINT UNSIGNED  | WordPress user ID                                           |
 | `offering_id`      | BIGINT UNSIGNED  | Nullable FK → `us_offerings.id` (private-lesson type)       |
 | `start_dt`         | DATETIME         | Slot start — stored as `Y-m-d H:i:s`                        |
-| `end_dt`           | DATETIME         | Slot end — stored as `Y-m-d H:i:s`                          |
-| `duration_minutes` | SMALLINT         | Lesson length the window accommodates (e.g. 30, 60)         |
+| `end_dt`           | DATETIME         | Slot end — always `start_dt + duration_minutes`             |
+| `duration_minutes` | SMALLINT         | Lesson length (e.g. 30, 60)                                 |
 | `is_booked`        | TINYINT(1)       | 0 = available, 1 = booked                                  |
 | `recurrence_group` | BIGINT UNSIGNED  | Nullable — weekly-recurring windows share one group id     |
 | `created_at`       | DATETIME         | Insertion time                                             |
 
-A window's `duration_minutes` is matched against the offering a student picks: a
-30-minute private offering can only be booked into a window whose
+A slot's `duration_minutes` is matched against the offering a student picks: a
+30-minute private offering can only be booked into a slot whose
 `duration_minutes` accommodates it.
 
+## Window Splitting
+`AvailabilitySlot::splitByDuration()` chunks a submitted window into consecutive
+`duration_minutes` slots; `AvailabilityRepository::createFromWindow()` persists
+one row per chunk. A trailing remainder shorter than the lesson length is
+dropped. Windows must start and end on the same day and fit at least one lesson;
+both the REST endpoint and the admin form reject one that does not, with a
+message saying so (see **REST API** below).
+`AvailabilityRepository::splitOversizedWindows()` is a data migration (run by
+`Installer` on activation or version change) that rewrites pre-split rows.
+
 ## Weekly-Recurring Windows
-Instructors may generate a window weekly across a date range. Each occurrence is a
-separate row sharing one `recurrence_group` id, so a recurring set can be added or
-removed together while individual occurrences are still booked independently.
+Instructors may generate a window weekly across a date range. Each lesson-length
+chunk becomes its own weekly series: occurrences of the same time-of-day share
+one `recurrence_group` id, so a recurring set can be added or removed together
+while individual occurrences are still booked independently.
 
 ## Admin Interface
 Instructors access **My Availability** in wp-admin (`?page=us-availability`).
-- Add a slot: provide start/end datetime, duration, and (optionally) a linked private-lesson offering
-- Add a weekly series: provide the weekday/time plus a date range
+- Add availability: provide a same-day start/end window, lesson length, and (optionally) a linked private-lesson offering
+- Add a weekly series: tick weekly repeat and choose the number of weeks
 - Delete a slot: only allowed if `is_booked = 0`
+- Bulk delete: the list view has a checkbox per unbooked slot (with a select-all header checkbox) and a **Delete selected** button (`usc_action=bulk_delete`, `slot_ids[]`); each id is ownership-checked, and booked slots are refused at the repository level
+- Current slots can be shown as a **weekly calendar** (the default, navigated with `usc_week=Y-m-d`) or a **list** (`usc_view=list`); the grid honours the site's `start_of_week` option via `Availability\WeekCalendar`
+
+### Feedback
+Every submitted action reports its outcome as a wp-admin notice — a success
+notice naming the number of slots created or deleted, or an error explaining the
+refusal. `AvailabilityController::handleFormAction()` returns a
+`[$notice, $error]` pair that `templates/admin/availability.php` renders.
+
+This matters because the form used to fail **silently**: a window shorter than
+the chosen lesson length splits into no slots, so nothing was written, nothing
+was said, and the page simply reloaded. Submitting 5:30–6:00 PM with the length
+select on its 60-minute default was the reported case. Invalid datetimes, an end
+before the start, a window spanning two days, and an offering belonging to
+another instructor were all silent in the same way.
+
+### Lesson-length choices
+`assets/js/availability-admin.js` (enqueued by `AdminMenu::enqueueAssets()` on
+this screen only) hides any lesson length longer than the entered window, falls
+back to the longest one that still fits when the current pick is hidden, and
+disables the submit button when nothing fits. It is a convenience, not a
+guarantee — the server validates the same window regardless. The choices come
+from `AvailabilitySlot::DURATION_CHOICES`.
 
 ## Public Calendar
-The front-end booking shortcode renders a month/week calendar of open windows,
-populated from `GET /availability`. Students can filter by instructor and by
-offering/duration before selecting a slot to register for.
+The front-end booking shortcode renders open slots from `GET /availability`
+either as an agenda-style list grouped by day or as a **weekly calendar** with
+previous/next-week navigation (toggle rendered by `assets/js/booking.js`; the
+site's `start_of_week` option is passed through the `usScheduler` JS config).
+Both views can be narrowed to the slots bookable as chosen private-lesson types
+with the **Show Only** lesson-type filter — see `lesson-booking.md`.
 
 ## REST API
 | Method   | Endpoint                                      | Permission                         |
@@ -45,13 +82,48 @@ offering/duration before selecting a slot to register for.
 | `DELETE` | `/wp-json/us-scheduler/v1/availability/{id}`  | `manage_availability` + slot owner |
 
 `GET` supports query params: `instructor_id`, `offering_id`, `duration_minutes`, `from` (datetime), `to` (datetime).
+Slots whose start has already passed are never returned.
+
+`POST` runs every submitted window — admin form and REST alike — through
+`Availability\WindowValidator`, which returns either the window ready to persist
+or a `WP_Error`. The REST endpoint returns that error directly (its `status`
+data makes it a 400); the admin screen shows `get_error_message()` in a notice.
+Sharing one validator is deliberate: the two paths previously checked the same
+rules separately, and the admin copy was both laxer (no offering-ownership
+check) and mute (a bare `return` on every rejection).
+
+| Rejection | Code |
+|---|---|
+| Start or end not a real datetime | `invalid_datetime` |
+| End at or before the start | `invalid_datetime` |
+| Window spans two days | `invalid_window` |
+| Window shorter than the lesson length (so it holds no slots) | `invalid_window` |
+| Offering missing, or owned by another instructor | `invalid_offering` |
+
+`start_dt`/`end_dt` are normalised by `AvailabilitySlot::normalizeDateTime()`:
+the canonical `Y-m-d H:i[:s]` and HTML `datetime-local` (`Y-m-d\TH:i[:s]`) forms
+become `Y-m-d H:i:s`; anything else is rejected. A valid window is stored as
+lesson-length slots and `201` returns `{ "ids": [...] }` for every row created.
+`weeks` is clamped to `AvailabilitySlot::MAX_WEEKLY_OCCURRENCES` in the
+repository, so the form's `max` cannot be bypassed by posting directly. A write
+that fails entirely returns `500 not_saved` rather than a `201` listing no ids.
+
+Times are displayed in 12-hour AM/PM form in the booking calendar and wp-admin
+lists.
 
 ## Implementation
 - Repository: `Unsupervised\Schedular\Availability\AvailabilityRepository`
 - Model: `Unsupervised\Schedular\Availability\AvailabilitySlot`
+- Week bucketing: `Unsupervised\Schedular\Availability\WeekCalendar`
 - Admin controller: `Unsupervised\Schedular\Availability\AvailabilityController`
 - REST endpoint: `Unsupervised\Schedular\Availability\AvailabilityEndpoint`
+- Shared window validation: `Unsupervised\Schedular\Availability\WindowValidator`
+- Admin form script: `assets/js/availability-admin.js`, enqueued by `AdminMenu::enqueueAssets()`
 
 ## Tests
+- `tests/Unit/Availability/AvailabilityControllerTest.php`
 - `tests/Unit/Availability/AvailabilityRepositoryTest.php`
 - `tests/Unit/Availability/AvailabilitySlotTest.php`
+- `tests/Unit/Availability/AvailabilityEndpointTest.php`
+- `tests/Unit/Availability/WeekCalendarTest.php`
+- `tests/Unit/Availability/WindowValidatorTest.php`

docs/features/cancellation-cutoff.md

@@ -0,0 +1,69 @@
+# Feature: Cancellation Cutoff
+
+## Overview
+Students may cancel their own lessons online — but not indefinitely close to the
+start time. A **cancellation cutoff** closes student-initiated cancellation once
+a lesson begins within a configured window. Instructors and studio admins are
+never subject to the cutoff: they can cancel a lesson at any time through the
+lesson-status and student-management flows.
+
+The window is resolved per lesson:
+
+1. If the lesson's **offering** sets its own cutoff, that value is used.
+2. Otherwise the **studio default** applies.
+
+Both values are expressed and computed in **hours**. The studio default is
+entered and displayed to the admin in **days** for convenience; a per-offering
+override is entered directly in hours (a finer-grained "time").
+
+## Data Model
+
+### Option `us_cancellation_cutoff_hours`
+Studio-wide default cutoff, stored as an integer number of **hours**. Defaults to
+`24` (one day) when unset. `0` means students may cancel at any time.
+
+### Column `{prefix}us_offerings.cancellation_cutoff_hours`
+Nullable `SMALLINT UNSIGNED`. `NULL` means "inherit the studio default"; any set
+value (including `0` — cancel any time) overrides it for that offering.
+
+## Resolution & Enforcement
+`Booking\CancellationPolicy` owns the logic:
+
+- `cutoffHours(?int $offeringCutoffHours): int` — the offering's override when it
+  is a non-negative value, otherwise the studio default.
+- `studentMayCancel(string $slotStartDt, ?int $offeringCutoffHours, ?string $now): bool`
+  — false once `now` is within the effective cutoff of the slot start. A zero
+  cutoff always allows cancellation; unparseable datetimes fail open so a student
+  is never trapped by bad data. Comparisons use WordPress-local time
+  (`current_time('mysql')`), matching how upcoming lessons are computed.
+- `describeCutoff(int $hours): string` — humanises a cutoff for messages
+  (whole days as days, otherwise hours).
+
+`Booking\BookingEndpoint::cancel()` (the student endpoint,
+`POST /bookings/{id}/cancel`) consults the policy before cancelling and returns a
+`cancellation_closed` (HTTP 403) error explaining the window when it is too late.
+The instructor status endpoint (`PATCH /bookings/{id}/status`) and
+`Auth\StudentActions::cancelLesson()` (studio-admin student view) bypass the
+policy entirely.
+
+## Admin Interface
+- **Studio Settings → Cancellations**: "Cancellation cutoff (days)" — the studio
+  default, entered/displayed in days, stored in hours.
+- **Offerings** add/edit form: "Cancellation cutoff (hours)" — an optional
+  per-offering override; blank inherits the studio default, `0` allows anytime
+  cancellation.
+
+## Implementation
+- Service: `Unsupervised\Schedular\Booking\CancellationPolicy`
+- Studio default: `Unsupervised\Schedular\Payment\StudioSettings::cancellationCutoffHours()`
+  (option `us_cancellation_cutoff_hours`)
+- Per-offering value: `Unsupervised\Schedular\Offering\Offering::$cancellationCutoffHours`
+- Enforcement: `Unsupervised\Schedular\Booking\BookingEndpoint::cancel()`
+- Wiring: `RestRegistrar` constructs `new CancellationPolicy( new StudioSettings() )`
+
+## Tests
+- `tests/Unit/Booking/CancellationPolicyTest.php`
+- `tests/Unit/Booking/BookingEndpointTest.php` (cutoff cases in `cancel()`)
+- `tests/Unit/Payment/StudioSettingsTest.php` (default getter)
+- `tests/Unit/Offering/OfferingTest.php`, `tests/Unit/Offering/OfferingRepositoryTest.php`
+  (new column round-trips)

docs/features/credits.md

@@ -0,0 +1,123 @@
+# Feature: Student Credits (cancelled paid lessons)
+
+## Overview
+When a lesson that has **already been paid for** is cancelled, the student is
+credited the amount they paid for *that lesson*. The credit sits on their account
+and is automatically applied against their future scheduled-billing charges
+(weekly / monthly) before they are asked to pay — so a cancelled-and-paid lesson
+becomes money toward the next one rather than a manual refund.
+
+This complements — it does not replace — the existing cancellation behaviour: a
+still-**pending** payment is voided (`PaymentService::voidPending`), and only a
+**paid** payment produces a credit.
+
+## Credit amount — one lesson's share
+The credit is one lesson's share of the covering payment's **total (including
+tax)**:
+
+| Covering payment | Lessons it covers | Credit on cancelling one |
+|------------------|-------------------|--------------------------|
+| Single booking (one-time / full-term single) | 1 | the whole total |
+| Weekly **scheduled** lesson | 1 (one payment per lesson) | the whole total |
+| Monthly **scheduled** charge | N lessons that month | `total ÷ N` |
+| Weekly reservation **series** paid upfront (full-term) | the whole series | `total ÷ series size` |
+
+The divisor is resolved in `PaymentService::coveredLessonCount`: a weekly series
+paid upfront (an *unscheduled* payment on a lesson that has a `series_id`) divides
+by the series size (`BookingRepository::countBySeries`); every other case divides
+by how many lessons point at the payment (`BookingRepository::countByPaymentId`),
+which is 1 for a single or weekly-scheduled lesson and N for a monthly charge.
+
+The original payment is **left untouched** — the studio keeps the money it
+collected; the credit is a forward-looking liability offset against future
+billing, never a refund of past revenue.
+
+### Guards
+- Only a **paid** payment credits; an unpaid/pending one is voided instead.
+- A lesson is credited **once** — `CreditRepository::existsForLesson` blocks a
+  second credit if the same lesson is cancelled again after being reinstated.
+- A non-anchor lesson in a series (no `payment_id` of its own) is credited through
+  the series anchor's payment.
+
+## Applying credit at billing time
+The daily scan (`Payment\ScheduledBillingRunner`) generates each student's due
+payments, then — before sending the notice — applies their available credit
+across those charges oldest-first (`PaymentService::applyCredits`):
+
+- Each payment's `us_payments.credit_applied` is raised by the amount covered,
+  reducing what the student owes (`Payment::netDue()`).
+- A payment **fully** covered by credit is marked **paid-by-credit** (status
+  `paid`, registration confirmed) so it drops out of the admin confirmation queue.
+- A payment **partially** covered stays `pending` at its reduced net due, shown in
+  the admin Payments queue and on the notice.
+- The credit ledger is drawn down by the total applied
+  (`CreditRepository::consume`, FIFO), marking each spent credit `consumed`.
+
+The consolidated notice email (`Payment\PaymentDueMailer`) lists each charge at
+its full amount, then an **"Account credit applied: -X"** line and the reduced
+**Total due**. When the balance is zero the notice still goes out (so the student
+knows their credit covered it) but carries no e-transfer destination or reference.
+
+## Admin visibility
+The studio admin sees a student's credit on their **student detail** page (gated by
+`manage_billing`, like the payment history). An **Account credit** section shows the
+available balance and a table of every credit — date, reason, original amount,
+remaining, and status (`available` / `consumed`). Built by
+`Auth\StudentHistory::creditBalance` / `::credits`.
+
+## Data model — `{prefix}us_credits`
+
+| Column              | Type            | Notes                                             |
+|---------------------|-----------------|---------------------------------------------------|
+| `id`                | BIGINT UNSIGNED | Primary key                                       |
+| `student_id`        | BIGINT UNSIGNED | WordPress user ID                                 |
+| `amount`            | DECIMAL(10,2)   | Original credit amount                            |
+| `remaining`         | DECIMAL(10,2)   | Unused balance                                    |
+| `currency`          | VARCHAR(3)      | ISO 4217                                          |
+| `source_payment_id` | BIGINT UNSIGNED | Payment that paid for the cancelled lesson        |
+| `source_lesson_id`  | BIGINT UNSIGNED | The cancelled lesson (dedup key)                  |
+| `reason`            | VARCHAR(191)    | Human-readable note                               |
+| `status`            | VARCHAR(20)     | `available` / `consumed`                          |
+| `created_at`        | DATETIME        | Insertion time                                    |
+| `updated_at`        | DATETIME        | Last draw-down; NULL until first consumed         |
+
+A new column on `{prefix}us_payments`:
+
+| Column           | Type          | Notes                                                     |
+|------------------|---------------|-----------------------------------------------------------|
+| `credit_applied` | DECIMAL(10,2) | Account credit applied to this payment; `netDue = total − credit_applied` |
+
+> **Schema change:** `us_credits` and `us_payments.credit_applied` ship as part of
+> the (as-yet-unreleased) **1.2.0** — the same release as scheduled billing — so
+> `Installer`/`dbDelta` create them when a pre-1.2.0 site upgrades. If you are on a
+> 1.2.0 *dev* build that predates this feature, the stored `us_schedular_version`
+> already matches `USC_VERSION`, so `Plugin::boot()` will not re-run the installer;
+> reactivate the plugin (or bump the version) to pick the new table/column up.
+
+## Reporting caveat
+Credits never touch past revenue and a credit-covered future charge is still
+marked `paid`, so `PaymentReport` (which sums `status = paid`) counts the original
+paid lesson and the later credit-covered lesson as gross revenue. This mirrors the
+design choice to leave the original payment intact rather than represent a partial
+refund of a shared payment.
+
+## Implementation
+- Model: `Unsupervised\Schedular\Payment\Credit`
+- Repository: `Unsupervised\Schedular\Payment\CreditRepository`
+- Issue on cancel: `PaymentService::creditForCancelledLesson`
+  (called from `Booking\BookingEndpoint::cancel` and `::updateStatus`)
+- Apply at billing: `PaymentService::applyCredits`, driven by
+  `Payment\ScheduledBillingRunner::sendNotices`
+- Net due: `Payment::netDue()`, `PaymentRepository::addCreditApplied`
+- Lesson counts: `Booking\BookingRepository::countByPaymentId` / `countBySeries`
+- Admin view: `Auth\StudentHistory::creditBalance` / `::credits`, rendered in
+  `templates/admin/student-detail.php`
+
+## Tests
+- `tests/Unit/Payment/CreditRepositoryTest.php`
+- `tests/Unit/Payment/PaymentServiceTest.php` (`creditForCancelledLesson`, `applyCredits`)
+- `tests/Unit/Payment/ScheduledBillingRunnerTest.php` (credit applied to a run)
+- `tests/Unit/Payment/PaymentDueMailerTest.php` (credit line + reduced total)
+- `tests/Unit/Payment/PaymentTest.php` (`netDue`)
+- `tests/Unit/Booking/BookingEndpointTest.php` (credit issued on cancel)
+- `tests/Unit/Auth/StudentHistoryTest.php` (`creditBalance`, `credits`)

docs/features/editor-blocks.md

@@ -0,0 +1,122 @@
+# Editor Blocks
+
+Gutenberg dynamic-block wrappers for the plugin's four front-end shortcodes,
+so the pages can be previewed and styled inside the block editor instead of
+appearing as grey shortcode text.
+
+## Blocks
+
+| Block | Wraps shortcode | Front-end renderer |
+|---|---|---|
+| `us-scheduler/booking` | `[us_booking]` | `Booking\BookingPage::render()` |
+| `us-scheduler/student-login` | `[us_student_login]` | `Auth\LoginPage::render()` |
+| `us-scheduler/student-register` | `[us_student_register]` | `Auth\RegistrationPage::render()` |
+| `us-scheduler/group-classes` | `[us_group_classes]` | `GroupClass\GroupClassPage::render()` |
+
+The shortcodes remain registered for back-compat; blocks and shortcodes share
+the same page objects (constructed once in `Plugin::boot()`), so front-end
+output is identical either way. Pasting a shortcode into the block editor
+auto-converts it to the matching block via a `transforms.from` shortcode
+transform.
+
+## Block options
+
+Four blocks have sidebar (inspector) options:
+
+| Block | Attribute | Default | Effect |
+|---|---|---|---|
+| `us-scheduler/booking` | `loginPageId` (number) | `0` | Page the "log in to book a lesson" link points to for logged-out visitors. `0` = the WordPress login screen (with a redirect back to the current page). |
+| `us-scheduler/booking` | `autoRedirect` (boolean) | `false` | Send logged-out visitors straight to the login page instead of showing the link. |
+| `us-scheduler/booking` | `lessonTypeId` (number) | `0` | Pin the calendar to a single private-lesson type: only the times bookable as that type are listed, and it is the only type students can book here (auto-selected on the registration form). `0` = every type. Shortcode equivalent: `[us_booking lesson_type="…"]`. |
+| `us-scheduler/booking` | `showTypeFilter` (boolean) | `true` | Whether students get the **Show Only** button that narrows the calendar to chosen lesson types. Unused when a single type is pinned (there is nothing to choose). Shortcode equivalent: `[us_booking show_filter="no"]`. |
+| `us-scheduler/booking` | `displayMode` (string) | `both` | Which halves of the page to embed: `both`, `booking` (calendar only, no upcoming-lessons panel) or `upcoming` (the student's lessons only, nothing bookable) — so the two halves can live on different pages. Anything unrecognised falls back to `both`. Shortcode equivalent: `[us_booking show="booking"]`. |
+| `us-scheduler/student-login` | `bookingPageId` (number) | `0` | Page the "View available lessons" link points to for logged-in visitors, and the post-login redirect target. `0` = the current page. |
+| `us-scheduler/student-login` | `autoRedirect` (boolean) | `false` | Send logged-in visitors straight to the booking page instead of showing the link. Does nothing until a booking page is chosen. |
+| `us-scheduler/student-register` | `loginPageId` (number) | `0` | Page students continue to once registration finishes — the "Sign in to your account" link after they confirm their email, and the "Continue to your account" link an invited student gets on the spot. `0` = the WordPress login screen for the confirmation link, and no link at all for the (already signed-in) invited student. Shortcode equivalent: `[us_student_register login_page_id="…"]`. |
+| `us-scheduler/student-register` | `autoRedirect` (boolean) | `false` | Send students straight to that page instead of showing the link. Does nothing until a page is chosen — there is no login-screen fallback here. |
+| `us-scheduler/group-classes` | `offeringId` (number) | `0` | Restrict the page to a single group class, for embedding on a page dedicated to that class. The class description is then omitted — only the schedule, instructor, price and enrolment controls are shown, so the surrounding page's own copy is not repeated. `0` = browse all classes, descriptions included. Shortcode equivalent: `[us_group_classes offering="…"]`. |
+
+The page selects list all published pages; if a chosen page is later deleted,
+the blocks fall back to their defaults. The group-classes block's class
+select is a dropdown of active group classes fetched from
+`GET /us-scheduler/v1/offerings?kind=group_class`; a stored class that is no
+longer offered shows as "Unavailable class #N" rather than silently falling
+back to all classes. The booking block's lesson-type select works the same way
+against `?kind=private_lesson` ("Unavailable lesson type #N"), and the live
+page says so plainly when the pinned type has been withdrawn.
+
+The booking block's options reach the front end as data attributes on
+`#us-booking-app` (`data-lesson-type`, `data-type-filter`) or as omitted
+containers (`displayMode`), which `assets/js/booking.js` reads on load — see
+`lesson-booking.md`. Its editor preview follows `displayMode`, showing the
+calendar, the upcoming-lessons panel, or both. The link targets are also available
+to the shortcodes as `[us_booking login_page_id="…"]` and
+`[us_student_login booking_page_id="…"]`; auto-redirect is block-only.
+
+Auto-redirect cannot happen during block rendering (output has already
+started, so a `Location` header cannot be sent). Instead
+`BlockRegistrar::maybeAutoRedirect()` runs on `template_redirect`, parses the
+queried singular post's content for the block (including inside nested
+blocks), and redirects when the block opts in. A block whose target is its
+own page is ignored to avoid a redirect loop.
+
+The registration block's auto-redirect additionally only fires on a
+**finished** registration — `RegistrationPage::isRegistrationComplete()`: an
+invited student who is now logged in (`?us_registered=invite`), or a
+self-signup back from the emailed confirmation link (`?us_confirmed=ready|1`).
+The intermediate "check your email" step and every failure (a validation
+error, `?us_confirmed=expired`) stay on the page so the student reads the
+message. That check runs before the content is parsed, so an ordinary page
+view does not pay for the extra block scan.
+
+## How it works
+
+- **`BlockRegistrar`** (`src/BlockRegistrar.php`) hooks `init` and registers
+  each block with `register_block_type()`: a `render_callback` per block, the
+  shared editor script (`assets/js/blocks.js`, handle
+  `us-scheduler-blocks`), and the front-end stylesheet
+  (`assets/css/frontend.css`, handle `us-scheduler`) as the block `style` so
+  it also loads inside the editor and previews pick up theme styling.
+- **`assets/js/blocks.js`** (vanilla JS, no build step) registers the client
+  side of each block — title, icon, keywords, shortcode transform — and
+  renders the editor preview with `wp.serverSideRender`, which fetches the
+  server-rendered markup via the `/wp/v2/block-renderer` REST route.
+- **`BlockPreview`** (`src/BlockPreview.php`) supplies static, script-free
+  markup for editor previews. `BlockRegistrar::isEditorPreview()` detects the
+  block-renderer context via the `REST_REQUEST` constant (front-end template
+  rendering never happens inside a REST request) and renders the preview
+  instead of the live page.
+
+## Editor preview behaviour
+
+Live pages cannot run in the editor: booking and group classes are populated
+by JavaScript making authenticated REST calls (and may load Stripe.js),
+registration requires a valid invite token, and login short-circuits for
+logged-in users (the editing admin always is). Each preview therefore
+reproduces the live wrapper elements and CSS classes with representative
+placeholder content:
+
+- **Booking** — `#us-booking-app` with sample `.us-day` / `.us-slot` rows and
+  disabled Book buttons.
+- **Group classes** — `#us-group-app` with a sample `.us-class` card and a
+  disabled Enrol button. When `offeringId` pins a single class the preview
+  drops the sample description, matching what the live page renders in that
+  mode.
+- **Login** — the real `templates/frontend/login-page.php` template (it has
+  no request-state dependencies).
+- **Registration** — a disabled sample of the `.us-register-form` fields.
+
+Each preview starts with a `.us-editor-note` paragraph explaining what the
+published page shows instead. The note class only appears in editor previews.
+
+## Tests
+
+- `tests/Unit/BlockRegistrarTest.php` — hook registration, block/asset
+  registration, attribute schemas, front-end delegation to the page objects,
+  preview-mode routing, auto-redirect behaviour.
+- `tests/Unit/Booking/BookingPageTest.php` — logged-out login-link targets
+  and fallbacks.
+- `tests/Unit/Auth/LoginPageTest.php` — logged-in booking-link targets and
+  fallbacks.
+- `tests/Unit/BlockPreviewTest.php` — preview markup mirrors the live CSS
+  classes/ids and includes the editor note.

docs/features/group-classes.md

@@ -3,6 +3,8 @@
 ## Overview
 Students enrol in a group class — an offering of kind `group_class` — as a commitment for the year. Enrolment is capacity-enforced and billed full-term upfront. Registration reuses the same flow as private lessons (intake questions + policy acceptance + payment).
 
+A group class can be marked **invite-only** (`us_offerings.access_mode = invite_only`, see `offerings.md`). Invite-only classes are hidden from the public catalog — they never appear in the student booking/group-class list — and can only be enrolled in by students the instructor has let in. See **Invite-only access** below.
+
 ## Data Model — `{prefix}us_group_enrollments`
 
 | Column         | Type             | Notes                                                       |
@@ -15,47 +17,180 @@ Students enrol in a group class — an offering of kind `group_class` — as a c
 | `payment_id`   | BIGINT UNSIGNED  | Nullable FK → `us_payments.id`                             |
 | `enrolled_at`  | DATETIME         | Insertion time                                             |
 
+## Class Dates, Time, and Instructor
+A group class offering carries `term_start`/`term_end` plus a `class_time` and an
+owning `instructor_id` (see `offerings.md`): one-off classes end the day they
+start; weekly classes run a set number of sessions, all at `class_time`. The class
+card on the enrolment page shows **when** the class meets (the date or date range
+plus the start time) and **who** teaches it (the assigned instructor's name,
+surfaced as `instructor_name` on the `GET /offerings` response). Instructor names
+in the group-class views (front and back end) use the instructor's real name
+(first + last) or nickname, never their login — see `Auth\UserName::format()`.
+
+Assigning an instructor to a scheduled class removes that instructor's open
+booking slots at the class time and flags any already-booked lesson that clashes;
+see **Instructor assignment** in `offerings.md`.
+
 ## Enrolment Flow
-1. Student opens a group class from the offering catalog.
+The class list is loaded together with the student's own enrolments
+(`GET /enrollments`); a class the student already has an `active` enrolment in
+shows "You are enrolled in this class." instead of the Enrol button (the
+server would reject the duplicate with `409 already_enrolled` regardless — a
+cancelled enrolment does not block re-enrolling).
+
+1. Student opens a group class from the offering catalog. Each class card shows its price with the **cadence** it is billed on — `120.00 CAD up front`, `40.00 CAD monthly`, and so on.
 2. Student answers the offering's questions (`GET /offerings/{id}/questions`).
 3. Student accepts the current published policy versions (`GET /policies`) — required to continue.
-4. Full-term payment is taken per the student's billing method (card by default; `pending` for e-transfer; skipped for comp). See `payments.md`.
-5. `POST /enrollments` creates the enrolment (`status = active`), records answers and policy acceptances, and links the payment — but only if the offering's `capacity` has not been reached.
-6. On successful payment (or comp) a receipt is emailed.
+4. The enrolment form restates the price (with HST) and requires a second, separate agreement to pay that amount before it will submit. See **Price Display and the Pay Agreement** in `payments.md`.
+5. Full-term payment is taken per the student's billing method (card by default; `pending` for e-transfer; skipped for comp). See `payments.md`.
+6. `POST /enrollments` creates the enrolment (`status = active`), records answers and policy acceptances, and links the payment — but only if the offering's `capacity` has not been reached.
+7. On successful payment (or comp) a receipt is emailed.
 
 Capacity is enforced at enrolment time by counting `active` rows for the offering;
 a class at capacity rejects further enrolments.
 
+Enrolment also closes after the class's **enrolment deadline** (the instructor's
+`enrollment_deadline`, defaulting to `term_start` — the first class day; see
+`offerings.md`). Past the deadline `POST /enrollments` rejects the enrolment with
+`403 enrollment_closed`, and the class list shows "Enrolment has closed." in place
+of the Enrol button. While enrolment is still open the class card shows an
+"Enrol by" line with the effective deadline date.
+
+The deadline only bounds student **self**-enrolment. An instructor (or studio admin)
+can still enrol someone by hand from the class **details page** — the **Add students
+directly** control, available for every group class, deliberately bypasses the
+deadline (and capacity) so a **late enrolment** can be added after the class has
+closed. Past the deadline the details page labels these as late enrolments. See
+**Admin Interface** below.
+
+## Withdrawal Flow
+A student may withdraw themselves from a class they are enrolled in through the same
+group-class page: an active enrolment shows a **Withdraw** button.
+`POST /enrollments/{id}/withdraw` marks the enrolment `cancelled` (freeing its
+capacity seat) and voids any still-pending payment. It **never issues an account
+credit** — a timely withdrawal is a clean exit, not a refund (credits are reserved
+for cancelled lessons; see `credits.md`).
+
+Self-withdrawal is bounded by the class's **withdrawal deadline** (the instructor's
+`withdrawal_deadline`; see `offerings.md`). Unlike the enrolment deadline it has no
+implicit default — a class with no deadline set stays open to withdrawal for its
+whole life. Past the deadline `POST /enrollments/{id}/withdraw` rejects the request
+with `403 withdrawal_closed`, and the class card shows "Withdrawal has closed —
+contact the studio to withdraw." in place of the Withdraw button. The endpoint also
+returns `404 not_found` for an unknown enrolment and `403 forbidden` when the
+enrolment is not the caller's own; a withdrawal of an already-cancelled enrolment is
+idempotent.
+
+The deadline only bounds student **self**-withdrawal. A studio admin can withdraw a
+student at any time from the **student detail page** (`Auth\StudentActions::withdrawEnrollment`),
+which is never subject to the deadline.
+
 ## REST API
-| Method   | Endpoint                                     | Permission                       |
-|----------|----------------------------------------------|----------------------------------|
-| `GET`    | `/wp-json/us-scheduler/v1/enrollments`       | Any logged-in user               |
-| `POST`   | `/wp-json/us-scheduler/v1/enrollments`       | `book_lesson`                    |
+| Method   | Endpoint                                        | Permission                       |
+|----------|-------------------------------------------------|----------------------------------|
+| `GET`    | `/wp-json/us-scheduler/v1/enrollments`          | Any logged-in user               |
+| `POST`   | `/wp-json/us-scheduler/v1/enrollments`          | `book_lesson`                    |
+| `POST`   | `/wp-json/us-scheduler/v1/enrollments/{id}/withdraw` | Owner (the enrolled student) |
 
 `POST /enrollments` body: `offering_id`, `answers[]` (`question_id` → value),
-`accepted_policy_version_ids[]`, and payment data (see `payments.md`).
+`accepted_policy_version_ids[]`, and payment data (see `payments.md`). The
+response includes `id`, `status`, and `payment` — a `{id, method, status}`
+summary, or `null` when the class is free (the front end then skips the
+payment step).
 
 `GET /enrollments` returns the caller's own enrolments, or all enrolments for the
 instructor's group classes if the caller has `view_own_lessons` on those offerings.
 
+`GET /offerings` (the catalog that feeds the group-class list) returns public
+offerings **plus** any invite-only offerings the caller has an access grant for, so a
+granted student sees the private class alongside public ones. Ungranted students never
+receive it. Enrolling in an invite-only class requires a grant: `POST /enrollments`
+rejects an ungranted student with `403 invite_required`, and a successful enrolment
+flips their grant from `invited` to `enrolled`.
+
+## Invite-only access
+
+Access to an invite-only class is recorded in `{prefix}us_group_access` — a grant per
+person, separate from the enrolment itself. The instructor manages access from
+**My Lessons → My Group Classes**. **Add students directly** is available on every
+class's details page (see **Admin Interface**); invite-only classes add two more
+controls beneath it:
+
+1. **Add students directly** — the selected registered students are enrolled immediately
+   (`status = active`) with a **pending payment** at the class price (comp students are
+   settled at once by `PaymentService`). No access grant is needed — this writes straight
+   to `us_group_enrollments` + `us_payments`. It bypasses the enrolment deadline and
+   capacity, so it doubles as the **late-enrolment** path after a class has closed.
+2. **Make available** — the selected registered students get an `invited` grant so the
+   class appears in their own group-class list; they then self-enrol through the normal
+   paid flow. Each is emailed a "you've been added" notice.
+3. **Invite by email** — for an address with no account yet: a tokenised personal invite
+   (`us_invites`, carrying `offering_id`) is created and the registration link emailed,
+   alongside an `invited` grant keyed by `email` + `invite_id`. If the address already has
+   a **pending** invite, the grant is attached to that invite and **no second link is
+   sent**. An address that already has an account is treated as **Make available** instead.
+
+When an email-invited person completes registration, `RegistrationPage` links their new
+account to the grant (`GroupAccessRepository::linkStudentByEmail`), so the invite-only
+class becomes enrollable for them — they choose whether to enrol.
+
+### Data Model — `{prefix}us_group_access`
+
+| Column        | Type            | Notes                                                                 |
+|---------------|-----------------|-----------------------------------------------------------------------|
+| `id`          | BIGINT UNSIGNED | Primary key                                                           |
+| `offering_id` | BIGINT UNSIGNED | FK → `us_offerings.id` (an invite-only group class)                   |
+| `student_id`  | BIGINT UNSIGNED | WordPress user ID; NULL until an email invitee registers              |
+| `email`       | VARCHAR(191)    | Email-invite grants only; used to link the account once it registers |
+| `invite_id`   | BIGINT UNSIGNED | FK → `us_invites.id` for email-invite grants; NULL otherwise          |
+| `status`      | VARCHAR(20)     | `invited` / `enrolled` / `revoked`                                    |
+| `invited_by`  | BIGINT UNSIGNED | Instructor who granted access                                        |
+| `created_at`  | DATETIME        | Insertion time                                                       |
+
 ## Admin Interface
-- **Group Classes** (`manage_options` / studio admin): all enrolments across instructors
-- Instructors see enrolments for their own group classes under **My Lessons**
+- **Group Classes** (`view_all_lessons` / studio admin): a per-class summary across
+  instructors — each class with its instructor, when it meets, and its active-enrolment
+  count against capacity (not a flat list of individual student enrolments). Selecting a
+  class (`?class_id=<id>`) opens the same per-class **details page** described below, so a
+  studio admin — including an owner-operator who also teaches, for whom the instructor
+  **My Group Classes** menu is hidden — can view any class's roster and manage invite-only
+  membership from here. Invite actions are permitted for the class's own instructor or any
+  `view_all_lessons` studio admin.
+- **My Lessons → My Group Classes** (`view_own_lessons` / instructor): a summary of the
+  instructor's own group classes — each with when it meets and its active-enrolment count
+  against capacity, plus a **View details** link (**View & invite** for invite-only
+  classes). Selecting a class (`?class_id=<id>`, scoped to the owning instructor) opens its
+  **details page**: a class-details panel (when, instructor, enrolled/capacity, duration,
+  price, schedule note, enrolment deadline, status), the roster of enrolled students with
+  enrolment and payment status, and an **Add students** section. Every class — public or
+  invite-only — carries the **Add students directly** control there, which enrols the
+  selected students immediately (a late enrolment past the deadline; the section says so
+  when the deadline has passed). Invite-only classes additionally get the
+  **make-available** and **invite-by-email** controls plus the list of who has been invited
+  but not yet enrolled. These are nonce-checked `usc_action` POSTs, scoped to the owning
+  instructor. The summary (`templates/admin/my-group-classes.php`) and the details page
+  (`templates/admin/my-group-class-detail.php`) are separate templates.
 
 ## Implementation
 - Repository: `Unsupervised\Schedular\GroupClass\EnrollmentRepository` (`countActiveForOffering`/`hasActiveEnrollment` enforce capacity and prevent duplicates)
+- Access grants: `Unsupervised\Schedular\GroupClass\GroupAccess` + `GroupAccessRepository` (`hasGrant`, `findGrantedOfferingIds`, `markEnrolled`, `linkStudentByEmail`)
 - Model: `Unsupervised\Schedular\GroupClass\Enrollment`
-- Admin controller: `Unsupervised\Schedular\GroupClass\GroupClassController` (gated on `view_all_lessons`)
+- Admin controller: `Unsupervised\Schedular\GroupClass\GroupClassController` — `renderPage` (studio admin per-class summary, `view_all_lessons`) and `renderInstructorPage` (instructor summary + `?class_id` roster detail, `view_own_lessons`)
 - REST endpoint: `Unsupervised\Schedular\GroupClass\EnrollmentEndpoint`
-- Frontend: `Unsupervised\Schedular\GroupClass\GroupClassPage` (`[us_group_classes]` shortcode)
+- Frontend: `Unsupervised\Schedular\GroupClass\GroupClassPage` (`[us_group_classes]` shortcode; `offering="…"` restricts it to a single class for embedding on a dedicated page — the block equivalent is the `offeringId` attribute). In single-class mode `assets/js/group-classes.js` leaves the class description out of the card, since the page it is embedded on already describes the class; the schedule, instructor, schedule note, price and enrolment controls are still shown.
 - Reuses `Registration\RegistrationGate` (intake answers + booking-scoped policy acceptance, type `enrollment`)
 
-> **Payment seam:** payment is deferred to #7. An enrolment is created with
-> `status = active` and `payment_id = null`; the pay→confirm + receipt step plugs
-> in later. Instructor-specific enrolment views (the spec's "under My Lessons")
-> are a follow-up — this iteration ships the studio-admin **Group Classes** page
-> (`view_all_lessons`) plus per-student/per-instructor REST queries.
+> **Payment:** a priced enrolment creates a payment via `Payment\PaymentService`
+> (`registration_type = enrollment`) and links it as `payment_id`; unpriced
+> enrolments return `payment: null` and skip the payment step. See `payments.md`
+> for the card/e-transfer/comp flows.
 
 ## Tests
+- `tests/Unit/GroupClass/GroupClassControllerTest.php` (roster + add/make-available/invite actions)
 - `tests/Unit/GroupClass/EnrollmentTest.php`
 - `tests/Unit/GroupClass/EnrollmentRepositoryTest.php`
+- `tests/Unit/GroupClass/EnrollmentEndpointTest.php` (invite-only gating)
+- `tests/Unit/GroupClass/GroupAccessTest.php`
+- `tests/Unit/GroupClass/GroupAccessRepositoryTest.php`
+- `tests/Unit/GroupClass/GroupClassPageTest.php`
+- `tests/Unit/Offering/OfferingEndpointTest.php` (catalog merges granted invite-only classes)

docs/features/lesson-booking.md

@@ -20,44 +20,130 @@ Students register for a private lesson by choosing an offering, picking a time (
 | `created_at`   | DATETIME         | Insertion time                                             |
 
 ## Registration Flow
-1. Student opens the page with the `[us_booking]` shortcode and browses the calendar.
-2. Student picks an **offering** (a 30 or 60-minute private-lesson type) and a slot.
+1. Student opens the page with the `[us_booking]` shortcode and browses open slots as a weekly calendar (the default, anchored to the week of the earliest open slot) or an agenda list (view toggle with previous/next-week navigation; times shown in 12-hour AM/PM form). A **Show Only** button beside the view toggle opens a lesson-type filter that narrows the open times to those bookable as the chosen types (see **Lesson-Type Filter**).
+2. Student picks a slot and an **offering** (a 30 or 60-minute private-lesson type). When the slot is tied to an offering the form shows it locked (the student sees exactly what they are booking); otherwise the form presents the instructor's active private-lesson offerings whose duration fits the slot, narrowed to the filtered types. When exactly one type remains it is pre-selected (its intake questions load immediately). Every booking requires an offering — a generic slot with no fitting offering cannot be booked online.
 3. For a `weekly` reservation, the same weekday/time is held for the rest of the offering's term.
 4. Student answers the offering's questions (`GET /offerings/{id}/questions`).
 5. Student accepts the current published policy versions (`GET /policies`) — required to continue.
-6. Payment is taken per the student's billing method (card by default; `pending` for e-transfer; skipped for comp). See `payments.md`.
-7. `POST /bookings` creates the lesson row(s) (`status = pending`), records answers and policy acceptances, marks `us_availability.is_booked = 1`, and links the payment.
-8. On successful payment (or comp) the lesson is `confirmed` and a receipt is emailed.
-9. Instructor sees the booking under **My Lessons** and may update status via `PATCH /bookings/{id}/status`.
+6. Student is shown what the booking costs — the offering's price with its **cadence** (at booking / up front / weekly / monthly), plus HST — and must tick a second, separate agreement to pay that amount before the form will submit. A weekly reservation quotes the per-lesson fee and the ceiling on the total it can claim. A free offering shows no price block. See **Price Display and the Pay Agreement** in `payments.md`.
+7. Payment is taken per the student's billing method (card by default; `pending` for e-transfer; skipped for comp). See `payments.md`.
+8. `POST /bookings` creates the lesson row(s) (`status = pending`), records answers and policy acceptances, marks `us_availability.is_booked = 1`, and links the payment. A booking with nothing owed (a free offering) creates no payment and is `confirmed` immediately.
+9. On successful payment (or comp) the lesson is `confirmed` and a receipt is emailed.
+10. Instructor sees the booking under **My Lessons** and may update status via `PATCH /bookings/{id}/status`.
+11. The booking page also shows the student their upcoming lessons (`GET /bookings`) — each with the booked offering's name and length, when it happens, a per-lesson status badge (pending payment / confirmed), and a **Cancel** button. Only the soonest five are shown; a **Show all** control reveals the rest. `GET /bookings` includes `offering_title` and `duration_minutes` for each lesson so the list needs no extra request.
+
+## Lesson-Type Filter
+Not every open slot can be booked as every private-lesson type — a slot tied to
+an offering takes that offering only, and a generic slot only takes types whose
+length fits. The booking calendar therefore carries a lesson-type filter,
+collapsed behind a **Show Only** button that sits in the calendar's control row
+beside the List/Week toggle. Opening it reveals the type list between that row
+and the calendar: a checkbox per active private-lesson type (from
+`GET /offerings?kind=private_lesson`, fetched once per page load), showing the
+instructor's name alongside the title when the catalog spans more than one
+instructor. The button carries the number of ticked types and stays highlighted
+while the filter is on, so a collapsed filter is never invisible. Both button and
+list are hidden when there is only one bookable type.
+
+Ticking one or more types narrows the calendar to the slots bookable as one of
+them; no ticks means no filter, and collapsing the list leaves the filter
+applied. Picking a filtered slot narrows the registration form's **Lesson type**
+picker the same way, and when exactly one type remains it is pre-selected and its
+intake questions load immediately. Changing the filter re-anchors the week view
+on the earliest matching slot, so the student never lands on an empty week.
+**Show all types** clears the filter.
+
+Bookability is decided client-side by `offeringFitsSlot()` in
+`assets/js/booking.js` — the mirror of the rule `POST /bookings` enforces (same
+instructor, the tied offering when there is one, otherwise a matching
+`duration_minutes`). The filter is a browsing aid only: the server re-checks
+every booking regardless.
+
+Two block/shortcode options change what the filter has to work with (see
+`editor-blocks.md`), passed to the script as data attributes on
+`#us-booking-app`:
+
+- **A pinned lesson type** (`data-lesson-type`) narrows the catalog to that one
+  offering, so the page lists only the times bookable as it and books nothing
+  else — the filter control hides itself, there being one type left. A pinned
+  type that is no longer offered shows "This lesson type is not available for
+  booking right now" rather than an empty calendar.
+- **Filter off** (`data-type-filter="0"`) drops the **Show Only** button
+  entirely; every open time is listed, as before the filter existed.
+
+## Embedding Halves of the Page
+The page has two halves — the booking calendar and the student's upcoming
+lessons — and the block/shortcode can embed either on its own (`displayMode` /
+`show`: `both` (default), `booking`, `upcoming`). The template simply omits the
+containers of the half that is not wanted, and the script skips the work that
+belongs to a missing container: an upcoming-only embed never requests
+availability or the offering catalog, and a booking-only embed never requests
+`GET /bookings`. An unrecognised value renders the whole page, so a typo cannot
+silently hide half of it.
+
+## Cancellation
+Students cancel their own lessons via `POST /bookings/{id}/cancel` (idempotent).
+Cancelling marks the lesson `cancelled`, frees the availability slot for
+rebooking, and voids a still-pending payment (marked `failed` so it leaves the
+admin confirmation queue). A `paid` payment is never touched — refunds are a
+manual, admin-side decision. Instructors cancelling via
+`PATCH /bookings/{id}/status` get the same slot release and payment voiding;
+reinstating a cancelled lesson re-claims its slot and fails with `409
+slot_taken` if the freed time was booked by someone else in the meantime.
 
 ## Weekly Reservations
 A weekly reservation creates one `series_id` shared across N lesson rows (one per
 week in the term) and reserves the matching availability windows. It is billed
-**full-term upfront** as a single payment (`billing_mode = full_term` on the
-offering).
+**upfront as a single payment** linked to the series' first (anchor) lesson:
+- `billing_mode = full_term` — the offering's price already covers the term and is charged once.
+- `billing_mode = one_time` — the per-lesson price is charged **once per occurrence actually claimed** (price × N).
+
+Settling that payment (Stripe webhook, e-transfer confirmation, comp) confirms
+**every non-cancelled lesson in the series**
+(`BookingRepository::updateStatusForSeries()`), not just the anchor row.
 
 ## REST API
 | Method    | Endpoint                                        | Permission                     |
 |-----------|-------------------------------------------------|--------------------------------|
 | `GET`     | `/wp-json/us-scheduler/v1/bookings`             | Any logged-in user             |
 | `POST`    | `/wp-json/us-scheduler/v1/bookings`             | `book_lesson`                  |
+| `POST`    | `/wp-json/us-scheduler/v1/bookings/{id}/cancel` | Logged-in owner of the lesson  |
 | `PATCH`   | `/wp-json/us-scheduler/v1/bookings/{id}/status` | `manage_availability` or admin |
 
 `POST /bookings` body: `offering_id`, `slot_id`, `recurrence`, `answers[]`
 (`question_id` → value), `accepted_policy_version_ids[]`, and payment data
-(see `payments.md`).
+(see `payments.md`). The response includes `ids`, the resulting lesson
+`status`, and `payment` — a `{id, method, status}` summary, or `null` when
+nothing is owed (the front end then skips the payment step).
 
-`GET /bookings` returns the caller's own lessons (student view) or upcoming lessons for the instructor if the caller has `manage_availability`.
+An offering is always required (`400 offering_required` otherwise): a slot tied
+to an offering uses that offering regardless of the request, while a generic
+slot uses the student's `offering_id`, which must be one of the instructor's
+active `private_lesson` offerings whose `duration_minutes` matches the slot.
+
+`GET /bookings` returns the caller's upcoming, non-cancelled lessons (their own
+for students; the instructor's for callers with `manage_availability`), each
+with the slot's `start_dt`/`end_dt`.
 
 Group classes follow the same registration flow but enrol against an offering of
 kind `group_class`; see `group-classes.md`.
 
 ## Admin Interface
 - **Scheduler** (`view_all_lessons` — studio admin / administrators): all upcoming lessons across all instructors
-- **My Lessons** (`view_own_lessons`): upcoming lessons for the logged-in instructor
+- **My Lessons** (`view_own_lessons`): upcoming lessons for the logged-in instructor. Hidden for users who also hold `view_all_lessons` — Scheduler is a superset, so the menu item would only duplicate it.
+
+Both pages open in a **Week** calendar view by default (`usc_view`/`usc_week`
+query params, same pattern as the availability page, bucketed via
+`Availability\WeekCalendar`), with the original table available as the **List**
+view — the list is where the per-lesson HST and e-transfer edit forms live. Both
+views show the booked offering's name, and each lesson links through (`?lesson_id=`)
+to a **detail view** (`LessonController::maybeRenderDetail()`) that shows the
+offering, time, status, notes, the policy versions the student accepted (with
+acceptance time and IP), and their intake-question answers. On **My Lessons** an
+instructor may only open their own lessons; the studio **Scheduler** may open any.
 
 ## Frontend Shortcodes
-- `[us_booking]` — student calendar + registration flow; requires `book_lesson` capability
+- `[us_booking]` — student calendar + registration flow; requires `book_lesson` capability. Attributes: `login_page_id`, `lesson_type` (pin one private-lesson offering), `show_filter` (`no` hides the **Show Only** filter), `show` (`both` / `booking` / `upcoming`)
 - `[us_student_login]` — front-end login form for students
 
 ## Implementation
@@ -65,15 +151,29 @@ kind `group_class`; see `group-classes.md`.
 - Model: `Unsupervised\Schedular\Booking\Lesson`
 - Registration gate: `Unsupervised\Schedular\Registration\RegistrationGate` — validates and records intake answers + booking-scoped policy acceptances; shared with group enrolment
 - Admin controller: `Unsupervised\Schedular\Booking\LessonController`
+- Admin lesson detail presenter: `Unsupervised\Schedular\Booking\LessonDetail` (per-lesson intake answers + policy acceptances), template `templates/admin/lesson-detail.php`
 - REST endpoint: `Unsupervised\Schedular\Booking\BookingEndpoint`
 - Frontend: `Unsupervised\Schedular\Booking\BookingPage`, `Unsupervised\Schedular\Auth\LoginPage`
+- Upcoming-lessons panel: rendered client-side into `#us-my-lessons` by `assets/js/booking.js` (`lessonRowHtml`/`renderMyLessons`), mirrored for the editor by `BlockPreview::upcomingLessons()` — keep the two markup shapes in step.
 
-> **Payment seam:** payment is deferred to the Payments feature (#7). For now a
-> booking is created with `status = pending` and `payment_id = null`; the
-> instructor confirms via `PATCH /bookings/{id}/status`. When payments land, the
-> pay→confirm + receipt step plugs into this seam. `GET /policies?scope=booking`
-> returns just the booking-gate policies the form must collect.
+> **Payment seam:** a priced booking is created with `status = pending` and its
+> payment linked via `payment_id`; the lesson is confirmed when the payment is
+> settled (see `payments.md`) or manually via `PATCH /bookings/{id}/status`.
+> Unpriced bookings skip the seam entirely and are confirmed at creation.
+> `GET /policies?scope=booking` returns just the booking-gate policies the form
+> must collect.
+>
+> **Frontend CSS scoping:** every rule for the booking page's own markup is
+> written under `#us-booking-app` (`assets/css/frontend.css`). These panels sit
+> inside whatever layout the active theme provides, and bare class selectors lose
+> to theme rules on `div`/`span`/`strong` — which flattens the flex layout and
+> renders the lesson details on top of the actions. The row's two columns are
+> `div`s for the same reason: the layout must not depend on overriding the
+> inline default. New booking-page rules should follow both conventions.
 
 ## Tests
 - `tests/Unit/Booking/BookingRepositoryTest.php`
 - `tests/Unit/Booking/LessonTest.php`
+- `tests/Unit/Booking/LessonControllerTest.php`
+- `tests/Unit/Booking/LessonDetailTest.php`
+- `tests/Unit/Booking/BookingEndpointTest.php`

docs/features/offerings.md

@@ -15,29 +15,104 @@ An offering is anything a student can register for: a private-lesson type (30 or
 | `duration_minutes` | SMALLINT         | Private lessons only (e.g. 30, 60); NULL for group classes  |
 | `price`            | DECIMAL(10,2)    | Price in dollars                                            |
 | `currency`         | VARCHAR(3)       | ISO 4217, e.g. `CAD`                                        |
-| `billing_mode`     | VARCHAR(20)      | `one_time` (single booking) or `full_term` (weekly / group) |
+| `billing_mode`     | VARCHAR(20)      | `one_time`, `full_term`, `weekly`, or `monthly` (see Billing Mode below) |
 | `allow_weekly`     | TINYINT(1)       | Private only — may be reserved weekly for the term          |
 | `capacity`         | SMALLINT         | Group only — max enrolments; NULL for private               |
 | `term_start`       | DATE             | Group / term offerings — first day; NULL otherwise          |
 | `term_end`         | DATE             | Group / term offerings — last day; NULL otherwise           |
+| `class_time`       | TIME             | Group only — time of day each session starts; NULL otherwise |
+| `enrollment_deadline` | DATE          | Group only — last day students may enrol; NULL defaults to `term_start` (the first class day) |
+| `withdrawal_deadline` | DATE          | Group only — last day a student may withdraw themselves; NULL keeps self-withdrawal open indefinitely |
 | `schedule_note`    | VARCHAR(191)     | Group only — human-readable schedule, e.g. "Tuesdays 4:00pm"|
+| `cancellation_cutoff_hours` | SMALLINT UNSIGNED | Optional per-offering cancellation cutoff in hours; NULL inherits the studio default (see `cancellation-cutoff.md`) |
+| `access_mode`      | VARCHAR(20)      | `public` (listed in the catalog) or `invite_only` (group classes hidden from the catalog — see `group-classes.md`) |
 | `is_active`        | TINYINT(1)       | 0 = hidden from registration, 1 = bookable                  |
 | `created_at`       | DATETIME         | Insertion time                                              |
 
 ## Billing Mode
 - `one_time` — charged once at booking (a single private lesson).
 - `full_term` — charged in full upfront at registration (a weekly private reservation or a year-long group class). See `payments.md`.
+- `weekly` — **not** charged at registration; a pending payment for one lesson's fee is generated **24 hours before each lesson** by the daily billing scan.
+- `monthly` — **not** charged at registration; on the **1st of each month** a single pending payment is generated for that month. A **private lesson**'s price is a per-lesson fee, so the month is billed (#lessons in the month) × fee; a **group class**'s price is the monthly fee itself, billed once for the month however many times the class meets in it.
+
+Students see the mode as a **cadence** beside every price on the front end — *at
+booking*, *up front*, *weekly*, *monthly* — and confirm it explicitly before a
+booking or enrolment goes through. See **Price Display and the Pay Agreement** in
+`payments.md`.
+
+`weekly` and `monthly` are *scheduled* billing (`Offering::isScheduledBilling()`): the
+booking/enrolment succeeds with no payment step, and payments are created later by the
+daily `us_generate_due_payments` cron scan. See `scheduled-billing.md` and `payments.md`.
+
+## Term Dates
+Group classes carry a term: `term_start` is the date of the first class and
+`term_end` the last. The add-offering form takes a start date plus a sessions
+control — **one-off** (the term ends the day it starts) or **weekly for N
+sessions** (`term_end = term_start + (N−1) weeks`, computed by
+`Offering::weeklyTermEnd()`). Dates are validated by `Offering::normalizeDate()`
+(strict `Y-m-d`); an invalid start date leaves both term columns NULL. The
+student-facing class card shows the date (one-off) or the date range with the
+weekly session count.
+
+## Class Time and Sessions
+A group class also carries `class_time` — the time of day each session starts —
+validated by `Offering::normalizeTime()` (strict `H:i`/`H:i:s`; garbage leaves it
+NULL). `class_time` + `term_start`/`term_end` + `duration_minutes` together define
+the concrete session windows: `Offering::sessionWindows()` returns one
+`{start, end}` per session (weekly across the term, or a single window for a
+one-off), and returns an empty list unless date, time, and a positive duration are
+all set. These windows drive availability reconciliation (see **Instructor
+assignment** below and `group-classes.md`).
+
+## Enrolment deadline
+A group class carries an optional `enrollment_deadline` the instructor sets on the
+offering form (blank leaves it NULL). `Offering::effectiveEnrollmentDeadline()`
+resolves it to the stored date, or to `term_start` (the first class day) when unset,
+so a class with no explicit deadline still closes to new enrolments once the first
+class arrives. `Offering::isEnrollmentOpen($today)` compares a `Y-m-d` "today"
+against that effective deadline (inclusive — the deadline day is still open). The
+enrolment endpoint enforces it (`403 enrollment_closed`) and the front-end
+group-class list mirrors the same rule; see `group-classes.md`.
+
+## Withdrawal deadline
+A group class also carries an optional `withdrawal_deadline` — the last day a
+student may withdraw *themselves* from the class. Unlike the enrolment deadline it
+has **no implicit default**: `Offering::isWithdrawalOpen($today)` treats an unset
+(NULL) deadline as always open, so a class only closes to self-withdrawal once the
+instructor sets a date and it passes (comparison is inclusive — the deadline day is
+still open). A withdrawal made while open frees the seat and voids any still-pending
+payment but **never issues an account credit** (credits are reserved for cancelled
+lessons; see `credits.md`). Once the deadline passes the student must contact the
+studio, and an admin withdraws them by hand from the student detail page — the admin
+path is never subject to the deadline. The student endpoint enforces it
+(`403 withdrawal_closed`) and the front-end group-class list mirrors the rule; see
+`group-classes.md`.
+
+## Instructor assignment
+Every offering has an owning `instructor_id`. A studio admin
+(`manage_instructors`) sees an **Instructor** picker on the offering form and may
+assign a group class to any instructor; a plain instructor never sees the picker
+and always owns the classes they create (the posted value is ignored for them, and
+updates never reassign the owner otherwise). When a group class is saved with an
+assigned instructor and a full schedule, `Offering\ClassSlotReconciler` clears that
+instructor's **open** availability slots overlapping each session so students can't
+book them, and reports any **already-booked** lesson that clashes as a conflict for
+the studio to resolve by hand (a booked lesson is never deleted). The result is
+surfaced as an admin notice after saving.
 
 ## Admin Interface
 Studio admin and instructors manage offerings under **Offerings** in wp-admin.
 - Studio admin (`manage_offerings`) manages offerings for any instructor.
 - Instructor (`manage_offerings`) manages only their own.
 - Each offering's intake questions are edited from the offering screen (see `registration-questions.md`).
+- The offerings list shows each offering's ID (needed for `[us_group_classes offering="…"]`) and its term dates.
+- **Edit** on a row reloads the page (`?usc_edit=<id>`) with the form prefilled; saving posts `usc_action=update`. Owner and currency are always preserved on update, so a form submission can never reassign an offering. Non-admin instructors can only load and update their own offerings.
+- The form includes a **description** textarea and an **Active — open for registration** checkbox (unchecking hides the offering from students without deleting it — the admin-UI counterpart of the REST `is_active` flag).
 
 ## REST API
 | Method   | Endpoint                                    | Permission                       |
 |----------|---------------------------------------------|----------------------------------|
-| `GET`    | `/wp-json/us-scheduler/v1/offerings`        | Public (active offerings only)   |
+| `GET`    | `/wp-json/us-scheduler/v1/offerings`        | `book_lesson` or `manage_offerings` (active offerings only) |
 | `POST`   | `/wp-json/us-scheduler/v1/offerings`        | `manage_offerings`               |
 | `PATCH`  | `/wp-json/us-scheduler/v1/offerings/{id}`   | `manage_offerings` + owner       |
 | `DELETE` | `/wp-json/us-scheduler/v1/offerings/{id}`   | `manage_offerings` + owner       |
@@ -46,10 +121,14 @@ Studio admin and instructors manage offerings under **Offerings** in wp-admin.
 
 ## Implementation
 - Repository: `Unsupervised\Schedular\Offering\OfferingRepository`
-- Model: `Unsupervised\Schedular\Offering\Offering`
+- Model: `Unsupervised\Schedular\Offering\Offering` (`normalizeTime`, `sessionWindows`, `effectiveEnrollmentDeadline`, `isEnrollmentOpen`)
 - Admin controller: `Unsupervised\Schedular\Offering\OfferingController`
-- REST endpoint: `Unsupervised\Schedular\Offering\OfferingEndpoint`
+- REST endpoint: `Unsupervised\Schedular\Offering\OfferingEndpoint` (public listing includes `instructor_name`)
+- Availability reconciliation: `Unsupervised\Schedular\Offering\ClassSlotReconciler` (uses `Availability\AvailabilityRepository::findOverlapping`)
 
 ## Tests
+- `tests/Unit/Offering/OfferingControllerTest.php`
 - `tests/Unit/Offering/OfferingRepositoryTest.php`
 - `tests/Unit/Offering/OfferingTest.php`
+- `tests/Unit/Offering/OfferingEndpointTest.php`
+- `tests/Unit/Offering/ClassSlotReconcilerTest.php`

docs/features/payment-reporting.md

@@ -54,6 +54,11 @@ and `instructor_id` query params as the page and returns `text/csv` with a
 `Content-Disposition: attachment` header. Instructor requests are scoped to
 their own rows regardless of `instructor_id`.
 
+Fields that a spreadsheet would interpret as a formula (leading `=`, `+`, `-`,
+`@`, tab, or CR — e.g. a hostile student display name) are prefixed with an
+apostrophe so the export can never carry CSV formula injection into Excel or
+Google Sheets.
+
 ## Implementation
 
 - Report aggregator (pure totals + CSV): `Unsupervised\Schedular\Payment\PaymentReport`

docs/features/payments.md

@@ -6,7 +6,9 @@ falls back to **e-transfer** — a pending payment a studio admin marks received
 so everything works without any credentials. When Stripe **is** configured the
 default rail becomes the **credit card**. The studio admin can override any
 student's method (card / e-transfer / comp). Single bookings are charged once;
-weekly reservations and group classes are charged the full term upfront. A
+weekly reservations and group classes are charged the full term upfront (a
+`full_term` price once, or a per-lesson `one_time` price × the occurrences
+reserved — see `lesson-booking.md`). A
 numbered receipt is emailed automatically when a payment is marked paid.
 
 > **Implemented:** the payment ledger, studio settings, method resolution
@@ -86,6 +88,9 @@ After booking, the destination on a payment can be corrected per booking:
 | `status`                   | VARCHAR(20)      | `pending` / `paid` / `failed` / `refunded`            |
 | `tax_rate`                 | DECIMAL(5,2)     | HST rate % frozen at booking; editable until paid     |
 | `tax_amount`               | DECIMAL(10,2)    | Computed tax in dollars (`amount × tax_rate / 100`)   |
+| `due_date`                 | DATE             | When a *scheduled* payment is due; NULL = due at registration (`Payment::isScheduled()`) |
+| `period_key`               | VARCHAR(20)      | Scheduled-billing dedup key: session date (weekly) or `YYYY-MM` (monthly); NULL otherwise |
+| `notice_batch`             | VARCHAR(32)      | Shared reference for the payments one due-notice email covers, so a lump-sum e-transfer reconciles to them; NULL otherwise |
 | `etransfer_email`          | VARCHAR(191)     | Frozen e-transfer destination; editable until confirmed |
 | `stripe_payment_intent_id` | VARCHAR(255)     | Stripe PaymentIntent id; NULL for e-transfer / comp   |
 | `receipt_number`           | VARCHAR(50)      | Sequential receipt id; set when `paid`                |
@@ -93,13 +98,84 @@ After booking, the destination on a payment can be corrected per booking:
 | `created_at`               | DATETIME         | Insertion time                                        |
 | `paid_at`                  | DATETIME         | When marked `paid`; NULL otherwise                    |
 
+## Price Display and the Pay Agreement
+Every price a student is shown on the front end carries its **cadence** — the
+offering's `billing_mode` in the words the student needs:
+
+| `billing_mode` | Shown as                          | Explained beneath as                                       |
+|----------------|-----------------------------------|------------------------------------------------------------|
+| `one_time`     | `at booking`                      | Charged once, when you book.                               |
+| `full_term`    | `up front`                        | Charged once, up front, for the whole term.                |
+| `weekly`       | `weekly`                          | Charged for each lesson, 24 hours before it starts.        |
+| `monthly`      | `per lesson monthly` / `monthly`  | Charged on the 1st of each month, for that month's lessons.|
+
+So a lesson type reads `50.00 CAD at booking` in the booking form's type picker,
+and a group class card reads `120.00 CAD up front`. A free offering shows `Free`.
+
+**`monthly` reads differently per offering kind, because it *bills* differently.**
+A private lesson's price is a per-lesson fee and its monthly charge is that
+month's lessons × the fee, so the fee is quoted **per lesson**
+(`50.00 CAD per lesson monthly`). A monthly group class is priced **per month** —
+`ScheduledBillingRunner::billGroupMonthly()` charges the fee once for the month
+however many times the class meets in it — so its figure is quoted as it stands
+(`120.00 CAD monthly`). The display split is `isPerLessonMonthly()` in
+`assets/js/pricing.js`; the billing split is the one place the monthly rule
+differs between the two kinds.
+
+Before a booking or enrolment can be submitted, the form shows the price again as
+a summary block with a **required agreement checkbox** — the second confirmation,
+distinct from the policy acceptances above it:
+
+> ☐ I agree to pay 56.50 CAD at booking.
+
+The agreed figure is the amount actually billed, so the studio **HST rate** is
+added to it (`usScheduler.taxRate`, localized from `us_hst_rate`) and broken out
+above the checkbox — matching the total `Payment::total()` charges. A comped
+student is not taxed and is not charged at all, so for them the quoted figure is
+an upper bound. A free offering has nothing to agree to and shows no block.
+
+Cadence-specific wording:
+
+- **Weekly reservation of a `one_time` lesson type** — the fee is charged once per
+  week claimed, so the agreement states the per-lesson amount and the total as a
+  ceiling ("up to 12 lessons, 678.00 CAD in total"). The occurrence count mirrors
+  `BookingEndpoint::MAX_WEEKLY_OCCURRENCES`; a slot another student takes first is
+  simply not claimed, so the real charge can come in under it.
+- **`weekly` / `monthly`** — nothing is taken at registration, so the agreement is
+  to the recurring charge: "I agree to pay 56.50 CAD per lesson, billed monthly."
+  A monthly **group class** agrees to its monthly figure instead ("I agree to pay
+  138.00 CAD monthly."), matching how its price is quoted on the card.
+
+All of this lives in `assets/js/pricing.js` (`window.usPricing`), shared by the
+booking and group-class flows so a price reads the same wherever it is met. The
+script is registered as `us-scheduler-pricing` and is a dependency of both
+`us-scheduler` and `us-scheduler-group`.
+
 ## Payment Flow
-1. During registration the front-end calls `POST /payments/intent`, which creates a Stripe PaymentIntent for a `card` student and returns the client secret. (`etransfer` returns a `pending` payment; `comp` returns none.)
+1. During registration the front-end calls `POST /payments/intent` — but only when the registration response carried a `payment` summary (unpriced registrations return `payment: null` and skip the payment step). The intent call creates a Stripe PaymentIntent for a `card` student and returns the client secret. (`etransfer` returns a `pending` payment; `comp` returns none.)
 2. The browser confirms the card payment with Stripe.
 3. Stripe calls `POST /payments/webhook`; on `payment_intent.succeeded` the payment is marked `paid`, `paid_at` is stamped, and the linked lesson/enrolment is `confirmed`.
 4. On transition to `paid`, `ReceiptMailer` assigns a `receipt_number`, emails the student a receipt, and stamps `receipt_sent_at`.
 5. For an e-transfer, the studio admin later calls `PATCH /payments/{id}` to mark it `paid`, which triggers the same confirmation + receipt.
 
+## Scheduled Billing (weekly / monthly)
+`weekly` and `monthly` offerings are **not** charged at registration. The booking /
+enrolment succeeds with `payment: null`; the lesson is confirmed (or the enrolment stays
+active) immediately, and payments are generated later by the daily
+`us_generate_due_payments` cron scan (`Payment\ScheduledBillingRunner`). Each generated
+payment carries a `due_date` and `period_key`, flows through the same
+`PaymentService::createForRegistration` (so HST, method resolution, e-transfer freezing
+and comp auto-pay are identical), and the student is emailed one consolidated itemised
+notice per scan (`Payment\PaymentDueMailer`). Because these payments are scheduled,
+`PaymentService::voidPending` never voids them — cancelling one lesson leaves a shared
+monthly charge (and every other lesson it covers) untouched, and never rebills. Full
+model, dedup, and the four generation cases are documented in `scheduled-billing.md`.
+
+Cancelling a lesson that was **already paid** issues the student an account credit for
+that lesson's share of what they paid; the next daily scan applies any available credit
+against their due charges (reducing `us_payments.credit_applied` → `Payment::netDue()`)
+before emailing the notice. See `credits.md`.
+
 ## REST API
 | Method  | Endpoint                                    | Permission                  |
 |---------|---------------------------------------------|-----------------------------|
@@ -116,8 +192,10 @@ See `payment-reporting.md` for the monthly report and CSV export endpoints.
 - Receipts: `Unsupervised\Schedular\Payment\ReceiptMailer`
 - Settings page: `Unsupervised\Schedular\Payment\StudioSettings`
 - REST endpoint: `Unsupervised\Schedular\Payment\PaymentEndpoint`
+- Front-end price display + pay agreement: `assets/js/pricing.js` (`window.usPricing`), registered and localized with `taxRate` by `Unsupervised\Schedular\ShortcodeRegistrar`
 
 ## Tests
+- `tests/Unit/ShortcodeRegistrarTest.php` (pricing helper registration + localized `taxRate`)
 - `tests/Unit/Payment/PaymentRepositoryTest.php`
 - `tests/Unit/Payment/PaymentTest.php`
 - `tests/Unit/Payment/StripeGatewayTest.php`

docs/features/plugin-self-update.md

@@ -0,0 +1,80 @@
+# Feature: Plugin Self-Update from Gitea Releases
+
+## Overview
+WordPress sites running this plugin receive updates directly from the Gitea
+repository's releases — no wordpress.org listing and no manual zip uploads.
+Publishing a release is the whole deploy: bump the version, merge to `main`,
+tag `vX.Y.Z` in Gitea. Every site sees the update on its next check and can
+install it with one click, or unattended if the site admin enables
+auto-updates for the plugin.
+
+## How It Works
+
+### Release side (`.gitea/workflows/release.yml`)
+Pushing a `v*` tag (including tags created through Gitea's "New Release" UI)
+triggers the release workflow, which:
+
+1. Fails if the tag does not match the `Version:` plugin header — a mismatch
+   would make sites see a phantom update forever, or never see a real one.
+2. Runs the test suite.
+3. Builds the distributable zip via `composer build` (`bin/build-zip.sh`):
+   a single top-level `unsupervised-schedular/` folder with a production
+   (no-dev) Composer autoloader.
+4. Creates the release for the tag (or reuses one created via the UI) and
+   attaches the zip as a release asset. Versions containing a hyphen
+   (e.g. `1.2.3-rc.1`) are flagged as pre-releases.
+
+The attached asset — not Gitea's auto-generated source archive — is the
+update package. Source archives have the wrong top-level folder name and no
+`vendor/` directory, so WordPress could not install them.
+
+### Site side (`src/Update/UpdateChecker.php`)
+The plugin header declares:
+
+```
+Update URI: https://git.unsupervised.ca/Unsupervised/unsupervised-scheduler
+```
+
+Since WP 5.8 that header both blocks wordpress.org from ever serving an
+update for a same-slug plugin and makes core fire the
+`update_plugins_git.unsupervised.ca` filter during update checks.
+`UpdateChecker` (registered in `Plugin::boot()`) answers that filter:
+
+1. Fetches `GET /api/v1/repos/Unsupervised/unsupervised-scheduler/releases/latest`
+   (anonymous — the repo is public). The `/latest` endpoint excludes drafts
+   and pre-releases, so `-rc` builds are never offered to sites.
+2. Caches the result (including failures) in the
+   `us_schedular_latest_release` transient for 6 hours.
+3. Strips the leading `v` from the tag and compares against `USC_VERSION`
+   with `version_compare`; PHP orders `1.0.0-rc.2 < 1.0.0` correctly.
+4. When newer, returns the release's first `.zip` asset as the update
+   package. Core takes over from there: Plugins-screen notice, one-click
+   update, and WP-Cron auto-updates if enabled.
+5. When not newer — the site is current, or the lookup failed — returns a
+   `no_update` payload (installed version, empty package). This keeps the
+   plugin in core's `update_plugins` transient so core's `update-supported`
+   flag stays set and the **Enable auto-updates** toggle shows on the
+   Plugins screen. Without it, an off-directory plugin is absent from the
+   transient between releases and the toggle never appears.
+
+Any API failure, malformed response, or asset-less release degrades to
+"no update available" (the `no_update` payload) — never an error surfaced
+to the site, and never a lost auto-update toggle during a Gitea blip.
+
+## Cutting a Release
+1. Bump the version in `unsupervised-schedular.php` (both the `Version:`
+   header and the `USC_VERSION` constant) and merge to `main`.
+2. Tag the merge commit `vX.Y.Z` — via Gitea's New Release UI or
+   `git tag vX.Y.Z && git push origin vX.Y.Z`.
+3. The release workflow attaches the zip; sites pick the update up on their
+   next check (twice daily via cron, or immediately from
+   Dashboard → Updates → Check again).
+
+## Classes
+
+| Class | Responsibility |
+|---|---|
+| `Update\UpdateChecker` | Answers core's `update_plugins_{hostname}` filter from the Gitea releases API |
+
+## Tests
+- `tests/Unit/Update/UpdateCheckerTest.php`

docs/features/policies.md

@@ -40,14 +40,22 @@ The studio admin drafts, versions, and publishes policies (e.g. cancellation, pa
 
 ## Versioning & Acceptance Rules
 - Editing a published policy creates a new `draft` version; the old version stays `published` until the draft is published.
+- Editing a `draft` version rewrites it in place — nobody has accepted it yet, so there is nothing to preserve and no new version is created. `PATCH /policies/{id}/versions/{vid}` allows only this case; the admin page also accepts an edit to a `published` or `archived` version and branches a new draft from it.
 - Publishing a draft sets it `published`, stamps `published_at`, archives the prior version, and points `us_policies.current_version_id` at it.
 - The registration gate requires acceptance of the `current_version_id` of every policy. Because acceptance is tied to `policy_version_id`, a newly published version is unaccepted and must be re-accepted at the student's next booking.
 
 ## Admin Interface
 **Policies** in wp-admin (`manage_policies`, studio admin only):
-- Create a policy; draft and edit version bodies
+- Create a policy; draft version bodies
+- View the content of any version (`?page=us-policies&policy_id={id}&version_id={vid}`), whatever its status
+- Edit from the viewer: a draft is saved in place; editing a published or archived version instead saves the text as a **new draft version** (the viewer follows to it), so text students have already accepted is never rewritten
 - Publish a draft version; view acceptance history per version
 
+## Rendering a Policy Body
+Bodies are typed into a plain textarea, so most are written as blank-line-separated prose with no markup. `PolicyVersion::bodyHtml()` is the single render path — `wp_kses_post()` then `wpautop()`, the same treatment WordPress gives post content — so unmarked-up text arrives as real paragraphs and bodies that do carry markup are left alone. It feeds the booking/enrolment JSON (`GET /policies`), the signup form, and the admin version viewer, which therefore previews exactly what students see.
+
+The acceptance markup (`.us-policy` / `.us-policy-body`) is styled in `assets/css/frontend.css` as a bounded, vertically scrolling reading box with `overflow-wrap: break-word`, so a long policy or a pasted URL cannot force a horizontal scrollbar or push the accept checkbox out of view. `RegistrationPage` enqueues that stylesheet for the signup gate; `BookingPage` and `GroupClassPage` already did.
+
 ## REST API
 | Method   | Endpoint                                                        | Permission        |
 |----------|-----------------------------------------------------------------|-------------------|
@@ -74,3 +82,5 @@ cover every policy's current version or the registration is rejected.
 - `tests/Unit/Policy/PolicyVersionRepositoryTest.php`
 - `tests/Unit/Policy/AcceptanceRepositoryTest.php`
 - `tests/Unit/Policy/PolicyServiceTest.php`
+- `tests/Unit/Policy/PolicyControllerTest.php`
+- `tests/Unit/Policy/PolicyEndpointTest.php`

docs/features/registration-questions.md

@@ -1,19 +1,30 @@
 # Feature: Registration Questions
 
 ## Overview
-Each offering can carry a set of intake questions the registrant must answer when booking. Questions are authored per offering by the studio admin or the owning instructor, and answers are stored against the resulting lesson or group enrolment.
+Questions come in two **scopes**:
+
+- **Offering scope** (`scope = 'offering'`) — intake questions a registrant answers when
+  booking a specific offering; authored per offering by the studio admin or the owning
+  instructor, and stored against the resulting lesson or group enrolment.
+- **Account scope** (`scope = 'account'`) — studio-wide questions every new student answers
+  **once at account signup**, as a required second step after choosing their name and
+  password. Authored by the studio admin only, and stored against the new user account.
+
+Both scopes share the `us_questions` / `us_question_answers` tables, the same field types,
+and the same authoring page (**Offerings → Questions**).
 
 ## Data Model — `{prefix}us_questions`
 
 | Column        | Type             | Notes                                                       |
 |---------------|------------------|-------------------------------------------------------------|
 | `id`          | BIGINT UNSIGNED  | Primary key                                                 |
-| `offering_id` | BIGINT UNSIGNED  | FK → `us_offerings.id` — questions are scoped per offering   |
+| `offering_id` | BIGINT UNSIGNED  | FK → `us_offerings.id` for offering-scoped questions; NULL for account-scoped |
+| `scope`       | VARCHAR(20)      | `offering` (default) or `account`                           |
 | `label`       | VARCHAR(255)     | The question text shown to the registrant                   |
 | `field_type`  | VARCHAR(20)      | `text` / `textarea` / `select` / `checkbox`                 |
 | `options`     | TEXT             | JSON array of choices (for `select`); NULL otherwise        |
 | `is_required` | TINYINT(1)       | 1 = registrant must answer to continue                      |
-| `sort_order`  | INT              | Display order within the offering                           |
+| `sort_order`  | INT              | Display order within the scope                              |
 | `is_active`   | TINYINT(1)       | 0 = retired, 1 = shown on the form                          |
 | `created_at`  | DATETIME         | Insertion time                                             |
 
@@ -23,27 +34,37 @@ Each offering can carry a set of intake questions the registrant must answer whe
 |---------------------|------------------|--------------------------------------------------------|
 | `id`                | BIGINT UNSIGNED  | Primary key                                            |
 | `question_id`       | BIGINT UNSIGNED  | FK → `us_questions.id`                                 |
-| `registration_type` | VARCHAR(20)      | `lesson` or `enrollment`                               |
-| `registration_id`   | BIGINT UNSIGNED  | FK → `us_lessons.id` or `us_group_enrollments.id`      |
+| `registration_type` | VARCHAR(20)      | `lesson`, `enrollment`, or `account`                  |
+| `registration_id`   | BIGINT UNSIGNED  | FK → `us_lessons.id`, `us_group_enrollments.id`, or the user ID (account scope) |
 | `student_id`        | BIGINT UNSIGNED  | WordPress user ID (denormalised for fast lookup)       |
 | `answer_value`      | TEXT             | The submitted answer (checkbox stored as `0`/`1`)      |
 | `created_at`        | DATETIME         | Insertion time                                        |
 
 The `registration_type` + `registration_id` pair is a polymorphic reference shared
-with `us_policy_acceptances` (see `policies.md`), letting answers attach to either a
-private lesson or a group enrolment.
+with `us_policy_acceptances` (see `policies.md`), letting answers attach to a private
+lesson, a group enrolment, or an account signup (`account` + the user ID).
 
-## Flow
-1. On the registration form, the front-end calls `GET /offerings/{id}/questions`.
+## Offering-scope Flow
+1. On the booking form, the front-end calls `GET /offerings/{id}/questions`.
 2. Required questions block submission until answered.
 3. Answers are sent in the `answers[]` array on `POST /bookings` or `POST /enrollments` and written to `us_question_answers` alongside the new registration row.
 
+## Account-scope Flow (signup step two)
+1. The `[us_student_register]` page (`Auth\RegistrationPage`) loads active account-scope questions via `QuestionRepository::findByScope('account')`.
+2. The form renders as two steps: step one is email/name/password/policies, step two is the questions. `assets/js/register.js` reveals step two behind a "Next" button (progressive enhancement — without JS both steps show and the single submit still works). This applies to **every** signup path (invite, group link, self-approval).
+3. On submit, required answers are validated **before** the user is created (a missing answer returns an error and creates no account); after creation each answered question is written to `us_question_answers` with `registration_type = 'account'`, `registration_id = student_id = <new user ID>`.
+4. A studio admin reviews the answers on the student's admin screen under **Registration Information** (`Auth\StudentHistory::registrationInfo()` lists every account question paired with the student's answer, "—" when unanswered). These rows are excluded from the offering-scope "Intake answers" table.
+
 ## Admin Interface
-Questions are edited from each offering's screen (**Offerings → Questions**).
-- Studio admin (`manage_questions`) edits questions on any offering.
-- Instructor (`manage_questions`) edits questions only on their own offerings.
+Both scopes are edited from **Offerings → Questions** (`Registration\QuestionController`):
+- Pick an offering to edit its questions, or **"Account signup (all registrations)"** for the account-scope questions.
+- Studio admin (`manage_questions` + `manage_instructors`) edits any offering's questions and the account-scope questions.
+- Instructor (`manage_questions`) edits questions only on their own offerings; the account-scope option is hidden.
 
 ## REST API
+Only offering-scope questions are exposed over REST. Account-scope questions are managed
+through the server-rendered admin page and read directly by `RegistrationPage`.
+
 | Method   | Endpoint                                          | Permission           |
 |----------|---------------------------------------------------|----------------------|
 | `GET`    | `/wp-json/us-scheduler/v1/offerings/{id}/questions`| Public               |
@@ -52,12 +73,19 @@ Questions are edited from each offering's screen (**Offerings → Questions**).
 | `DELETE` | `/wp-json/us-scheduler/v1/questions/{id}`         | `manage_questions` + owner |
 
 ## Implementation
-- Repositories: `Unsupervised\Schedular\Registration\QuestionRepository`, `Unsupervised\Schedular\Registration\AnswerRepository`
-- Models: `Unsupervised\Schedular\Registration\Question`, `Unsupervised\Schedular\Registration\Answer`
+- Repositories: `Unsupervised\Schedular\Registration\QuestionRepository` (`findByOffering`, `findByScope`), `Unsupervised\Schedular\Registration\AnswerRepository`
+- Models: `Unsupervised\Schedular\Registration\Question` (`scope`, nullable `offeringId`), `Unsupervised\Schedular\Registration\Answer` (`REG_ACCOUNT`)
 - Admin controller: `Unsupervised\Schedular\Registration\QuestionController`
-- REST endpoint: `Unsupervised\Schedular\Registration\QuestionEndpoint`
+- REST endpoint: `Unsupervised\Schedular\Registration\QuestionEndpoint` (offering scope only)
+- Signup step two: `Unsupervised\Schedular\Auth\RegistrationPage`, `templates/frontend/register-page.php`, `assets/js/register.js`
+- Admin review: `Unsupervised\Schedular\Auth\StudentHistory::registrationInfo()`, `templates/admin/student-detail.php`
+- Schema: `us_questions.scope` + nullable `us_questions.offering_id` (requires a plugin version bump so `dbDelta` runs)
+- Nullability repair: `dbDelta` does **not** reliably relax a column from `NOT NULL` to `NULL`, so sites created before account-scope questions kept `offering_id NOT NULL` and rejected account inserts. `QuestionRepository::ensureOfferingNullable()` re-applies the nullable definition (idempotent `ALTER … MODIFY`); `Plugin::boot()` runs it once, guarded by the `us_questions_offering_nullable` option rather than the version gate (affected sites may already be on the current version)
 
 ## Tests
 - `tests/Unit/Registration/QuestionRepositoryTest.php`
 - `tests/Unit/Registration/AnswerRepositoryTest.php`
 - `tests/Unit/Registration/QuestionTest.php`
+- `tests/Unit/Registration/AnswerTest.php`
+- `tests/Unit/Auth/RegistrationPageTest.php`
+- `tests/Unit/Auth/StudentHistoryTest.php`

docs/features/scheduled-billing.md

@@ -0,0 +1,96 @@
+# Feature: Scheduled Billing (weekly / monthly)
+
+## Overview
+Two offering billing modes defer payment past registration and generate pending
+payments on a recurring schedule:
+
+- **`weekly`** — one payment per lesson, due **24 hours before** that lesson.
+- **`monthly`** — one payment per calendar month, due on the **1st**, covering every
+  lesson that falls in the month. A **private lesson**'s fee is per lesson, so the
+  month costs (#lessons) × fee. A **group class**'s fee is per month: the class is
+  billed that fee once for the month, however many times it meets in it.
+
+Both apply to **private lessons** and **group classes**. At registration the
+booking/enrolment succeeds with `payment: null` (no payment step); the lesson is
+confirmed / the enrolment stays active immediately. Payments are created later by a daily
+WP-Cron scan, and the student is emailed one consolidated notice per scan. Collection
+uses the existing rails (e-transfer confirmed by the studio admin, or card) — there is no
+automatic card charging.
+
+## The daily scan — `Payment\ScheduledBillingRunner`
+Hooked to the WP-Cron action **`us_generate_due_payments`** (scheduled `daily` by
+`Installer`, cleared on plugin deactivation). `run()` is self-healing: it re-derives
+everything due from current ledger state each run, so a missed day is simply picked up
+next time. Every payment is created through `PaymentService::createForRegistration` (HST,
+method resolution, e-transfer freezing, comp auto-pay reused) with a `due_date` and
+`period_key` set.
+
+### The four generation cases
+| Source | When it bills | Amount | Dedup |
+|--------|---------------|--------|-------|
+| **Private weekly** | lesson `start_dt` ≤ now + 24h | 1 × fee | `us_lessons.payment_id` set on the lesson |
+| **Private monthly** | the lesson's month's 1st ≤ today | (#lessons in month) × fee | `payment_id` set on every lesson in the month |
+| **Group weekly** | session (from `Offering::sessionWindows()`) − 1 day ≤ now | 1 × fee | `us_payments.period_key` = session date |
+| **Group monthly** | the month's 1st ≤ today | 1 × fee (a monthly class is priced per month, not per session) | `period_key` = `YYYY-MM` |
+
+- Private lessons dedup on `us_lessons.payment_id IS NULL` — a lesson with no payment is
+  unbilled. A monthly group links its earliest lesson via `createForRegistration` and the
+  runner points the remaining lessons at the same payment.
+- Group enrolments (one row per whole term) dedup on `period_key` via
+  `PaymentRepository::existsForPeriod()`, since one enrolment maps to many periodic
+  charges.
+- Only offerings with a positive price are billed; cancelled lessons are excluded, so a
+  lesson cancelled before its payment is generated is simply never billed.
+
+### Late bookings charge at booking time
+A single scheduled lesson booked **after** its due date has already passed is charged at
+booking instead of deferred (`BookingEndpoint::scheduledDueHasPassed`): an extra monthly
+lesson added to a month that was already billed (its 1st has arrived), or a weekly lesson
+booked within 24 hours of the session. These create a normal at-registration payment (no
+`due_date`), so the fee is collected once, at booking, and never billed late by the scan.
+This applies only to single bookings — a weekly reservation series always defers, each
+lesson billed by the scan on its own schedule.
+
+## Notification — `Payment\PaymentDueMailer`
+As the runner creates each **pending** payment it appends an itemised line to that
+student's notice bucket; after all cases run it sends **one** email per student with a
+line per item (label · due date · amount) and a grand total, plus the e-transfer
+destination(s). A student billed for several lessons on one day is emailed once, never
+per lesson. Comp payments (auto-paid) are not bucketed.
+
+### Notice batch (lump-sum reconciliation)
+All the payments in one student's notice are tagged with a shared **notice batch**
+reference (`us_payments.notice_batch`, `PaymentRepository::assignNoticeBatch`), which is
+printed on the email so the student can quote it. In the **Payments** admin queue those
+payments are shown grouped under that reference with a combined lump-sum total
+(`PaymentController::groupPending`), so when one e-transfer arrives for the whole notice
+the admin can see exactly which pending payments — and therefore which bookings — it
+covers. Each is still confirmed individually with **Mark received**. Legacy
+at-registration payments have no batch and appear on their own.
+
+## Cancellation
+Scheduled payments are never auto-voided. `PaymentService::voidPending` acts only on
+legacy at-registration payments (`! Payment::isScheduled()`), so cancelling one lesson
+never voids a shared monthly charge, never refunds, and never rebills.
+
+Cancelling a lesson that was **already paid** credits the student one lesson's share
+of what they paid (`PaymentService::creditForCancelledLesson`), and the next scan
+applies that credit against their due charges before emailing the notice
+(`PaymentService::applyCredits`). See `credits.md` for the full model.
+
+## Implementation
+- Runner: `Unsupervised\Schedular\Payment\ScheduledBillingRunner`
+- Notice email: `Unsupervised\Schedular\Payment\PaymentDueMailer`
+- Finders: `Booking\BookingRepository::findUnbilledScheduledLessons`,
+  `GroupClass\EnrollmentRepository::findActiveByBillingModes`
+- Dedup: `Payment\PaymentRepository::existsForPeriod`
+- Session windows: `Offering\Offering::sessionWindows`
+- Cron scheduling: `Installer::scheduleBilling`; cleared in `unsupervised-schedular.php`
+  deactivation hook.
+
+## Tests
+- `tests/Unit/Payment/ScheduledBillingRunnerTest.php`
+- `tests/Unit/Payment/PaymentDueMailerTest.php`
+- `tests/Unit/Payment/PaymentRepositoryTest.php` (`existsForPeriod`, `due_date`/`period_key`)
+- `tests/Unit/Payment/PaymentServiceTest.php` (`voidPending` skips scheduled)
+- `tests/Unit/Booking/BookingEndpointTest.php` / `tests/Unit/GroupClass/EnrollmentEndpointTest.php` (deferred payment)

docs/features/student-administration.md

@@ -1,15 +1,21 @@
 # Feature: Student Administration
 
 ## Overview
-A read-only studio-admin area to browse students and drill into one student's
-history and upcoming activity — lessons and group-class enrolments — without
-digging through individual records.
+A studio-admin area to browse students, drill into one student's history and
+upcoming activity — lessons and group-class enrolments — and act on their
+behalf: cancel a lesson, withdraw them from a group class, or fix their account
+details.
 
 ## Data Model
 No new tables. The views are composed from existing data:
 - Students are WordPress users with the `us_student` role (`get_users`, `get_userdata`).
 - Lessons come from `{prefix}us_lessons` (with `{prefix}us_availability` for slot times).
 - Group-class enrolments come from `{prefix}us_group_enrollments`.
+- Policy acceptances come from `{prefix}us_policy_acceptances` (with the policy
+  and version tables for titles/numbers).
+- Intake answers come from `{prefix}us_question_answers` (with `{prefix}us_questions`
+  for labels).
+- Payments come from `{prefix}us_payments`.
 
 ## Admin Interface
 **Students** in wp-admin (`manage_students`, studio admin only):
@@ -22,10 +28,30 @@ No new tables. The views are composed from existing data:
   - **Upcoming lessons** and **Past lessons** — split by the linked availability
     slot's `start_dt`; each shows date/time, offering, instructor, and status.
   - **Group-class enrolments** — active/past, with offering title and status.
-  - *(Later)* policy-acceptance history, intake answers, and payment history once
-    Payments lands.
+  - **Policy acceptances** — every acceptance the student has recorded, newest
+    first: policy title, version, context (account signup / lesson / enrolment),
+    and when it was accepted.
+  - **Intake answers** — every registration-question answer, newest first:
+    question label, answer, and the registration it was given for.
+  - **Account credit** (`manage_billing` only) — the student's available credit
+    balance plus every credit (date, reason, amount, remaining, status). Credit
+    comes from cancelled paid lessons and is applied automatically to upcoming
+    scheduled billing. See `credits.md`.
+  - **Payment history** (`manage_billing` only) — every payment, newest first:
+    date, context, method, status, subtotal, HST, total, and receipt number.
 
-Read-only in this iteration; cancel/edit actions are a possible follow-up.
+### Admin actions (detail view)
+All actions are nonce-protected POSTs handled on the detail page:
+
+- **Edit account** — display name and email. The email must be valid and not in
+  use by another account.
+- **Cancel lesson** — on any non-cancelled upcoming lesson. Uses the same path
+  as student-initiated cancellation: the lesson is marked `cancelled`, the
+  availability slot is freed for rebooking, and a still-pending payment is
+  voided. A paid lesson is credited back to the student's account (see
+  `credits.md`) rather than refunded.
+- **Withdraw** — on an active group-class enrolment: marked `cancelled` (freeing
+  its capacity seat), with the same pending-payment voiding.
 
 ## Capabilities
 - `manage_students` — studio admin (administrators inherit it via the
@@ -38,6 +64,15 @@ Read-only in this iteration; cancel/edit actions are a possible follow-up.
   `Availability\AvailabilityRepository::findById`,
   `Offering\OfferingRepository::findById`,
   `GroupClass\EnrollmentRepository::findByStudent` + `countActiveForStudent`
+- History sections: `Auth\StudentHistory` builds the display rows from
+  `Policy\AcceptanceRepository::findByStudent`,
+  `Registration\AnswerRepository::findByStudent`, and
+  `Payment\PaymentRepository::findByStudent`, resolving policy/version titles and
+  question labels (unit-tested with mocked repositories).
+- Actions: `Auth\StudentActions` — cancel lesson / withdraw enrolment (both
+  refuse records that don't belong to the student, and reuse
+  `Payment\PaymentService::voidPending`) and account updates via
+  `wp_update_user` (unit-tested with mocked repositories).
 - Upcoming/past split: `Auth\StudentSchedule::partition()` (pure, unit-tested)
 - The upcoming/past split is extracted into a small pure helper so it is
   unit-testable (the controller itself follows the repo convention of not being
@@ -45,3 +80,9 @@ Read-only in this iteration; cancel/edit actions are a possible follow-up.
 
 ## Tests
 - `tests/Unit/Auth/StudentScheduleTest.php` (the pure upcoming/past split helper)
+- `tests/Unit/Auth/StudentHistoryTest.php` (history display rows + fallbacks)
+- `tests/Unit/Auth/StudentActionsTest.php` (cancel/withdraw guards + side
+  effects, account validation)
+- `findByStudent` coverage in `tests/Unit/Policy/AcceptanceRepositoryTest.php`,
+  `tests/Unit/Registration/AnswerRepositoryTest.php`, and
+  `tests/Unit/Payment/PaymentRepositoryTest.php`

phpcs.xml.dist

@@ -44,7 +44,32 @@
         </properties>
     </rule>
 
+    <!--
+        Val::* type-narrowing helpers (src/Val.php) wrap superglobal reads so
+        PHPStan level 10 sees a typed value, e.g.
+        `absint( Val::int( $_GET['id'] ?? 0 ) )`. The sniff walks wrapping
+        calls innermost-out and aborts at the first unrecognised function
+        name, so the Val method names must be registered for it to look past
+        them. Because they are static calls (`::`), the sniff never credits
+        them as sanitizers themselves — it skips them and still requires a
+        real sanitizing function around the read.
+    -->
+    <rule ref="WordPress.Security.ValidatedSanitizedInput">
+        <properties>
+            <property name="customUnslashingSanitizingFunctions" type="array">
+                <element value="int"/>
+                <element value="intOrNull"/>
+                <element value="float"/>
+                <element value="bool"/>
+            </property>
+            <property name="customSanitizingFunctions" type="array">
+                <element value="string"/>
+                <element value="stringOrNull"/>
+            </property>
+        </properties>
+    </rule>
+
     <!-- PHP 8.1+ minimum — allow modern syntax. -->
-    <config name="minimum_supported_wp_version" value="6.0"/>
+    <config name="minimum_supported_wp_version" value="6.2"/>
     <config name="testVersion" value="8.1-"/>
 </ruleset>

phpstan.neon

@@ -2,7 +2,7 @@ includes:
     - vendor/szepeviktor/phpstan-wordpress/extension.neon
 
 parameters:
-    level: 6
+    level: 10
     paths:
         - src
     bootstrapFiles:

src/AdminMenu.php

@@ -5,39 +5,57 @@ namespace Unsupervised\Schedular;
 
 use Unsupervised\Schedular\Availability\AvailabilityController;
 use Unsupervised\Schedular\Availability\AvailabilityRepository;
+use Unsupervised\Schedular\Availability\WindowValidator;
 use Unsupervised\Schedular\Auth\AccessSettings;
 use Unsupervised\Schedular\Auth\InstructorController;
 use Unsupervised\Schedular\Auth\InviteRepository;
+use Unsupervised\Schedular\Auth\RegistrationApprovalController;
 use Unsupervised\Schedular\Auth\RegistrationController;
+use Unsupervised\Schedular\Auth\RegistrationMailer;
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Auth\StudentActions;
 use Unsupervised\Schedular\Auth\StudentController;
+use Unsupervised\Schedular\Auth\StudentHistory;
 use Unsupervised\Schedular\Booking\BookingRepository;
 use Unsupervised\Schedular\Booking\LessonController;
+use Unsupervised\Schedular\Booking\LessonDetail;
 use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
 use Unsupervised\Schedular\GroupClass\GroupClassController;
+use Unsupervised\Schedular\Offering\ClassSlotReconciler;
 use Unsupervised\Schedular\Offering\OfferingController;
 use Unsupervised\Schedular\Offering\OfferingRepository;
 use Unsupervised\Schedular\Payment\BillingMethodResolver;
+use Unsupervised\Schedular\Payment\CreditRepository;
 use Unsupervised\Schedular\Payment\PaymentController;
 use Unsupervised\Schedular\Payment\PaymentReportController;
 use Unsupervised\Schedular\Payment\PaymentRepository;
 use Unsupervised\Schedular\Payment\PaymentService;
 use Unsupervised\Schedular\Payment\StudioSettings;
+use Unsupervised\Schedular\Policy\AcceptanceRepository;
 use Unsupervised\Schedular\Policy\PolicyController;
 use Unsupervised\Schedular\Policy\PolicyRepository;
 use Unsupervised\Schedular\Policy\PolicyService;
 use Unsupervised\Schedular\Policy\PolicyVersionRepository;
+use Unsupervised\Schedular\Registration\AnswerRepository;
 use Unsupervised\Schedular\Registration\QuestionController;
 use Unsupervised\Schedular\Registration\QuestionRepository;
 
 class AdminMenu {
 
+	/**
+	 * Hook suffix of the availability screen, captured when the page is added so
+	 * its script loads on that screen only.
+	 */
+	private string $availabilityHook = '';
+
 	private AvailabilityController $availabilityController;
 	private LessonController $lessonController;
 	private OfferingController $offeringController;
 	private QuestionController $questionController;
 	private PolicyController $policyController;
 	private RegistrationController $registrationController;
+	private RegistrationApprovalController $registrationApprovalController;
 	private GroupClassController $groupClassController;
 	private StudentController $studentController;
 	private InstructorController $instructorController;
@@ -46,27 +64,48 @@ class AdminMenu {
 	private PaymentController $paymentController;
 	private PaymentReportController $paymentReportController;
 
-	public function __construct( AvailabilityRepository $availability, BookingRepository $bookings, OfferingRepository $offerings, QuestionRepository $questions, PolicyRepository $policies, PolicyVersionRepository $policyVersions, PolicyService $policyService, InviteRepository $invites, EnrollmentRepository $enrollments, StudioSettings $settings, PaymentRepository $payments, PaymentService $paymentService, BillingMethodResolver $resolver ) {
-		$this->availabilityController  = new AvailabilityController( $availability, $offerings );
-		$this->lessonController        = new LessonController( $bookings, $payments );
-		$this->offeringController      = new OfferingController( $offerings );
-		$this->questionController      = new QuestionController( $questions, $offerings );
-		$this->policyController        = new PolicyController( $policies, $policyVersions, $policyService );
-		$this->registrationController  = new RegistrationController( $invites );
-		$this->groupClassController    = new GroupClassController( $enrollments, $offerings );
-		$this->studentController       = new StudentController( $bookings, $availability, $offerings, $enrollments, $resolver );
-		$this->instructorController    = new InstructorController();
-		$this->settings                = $settings;
-		$this->accessSettings          = new AccessSettings();
-		$this->paymentController       = new PaymentController( $payments, $paymentService );
-		$this->paymentReportController = new PaymentReportController( $payments );
+	public function __construct( AvailabilityRepository $availability, BookingRepository $bookings, OfferingRepository $offerings, QuestionRepository $questions, AnswerRepository $answers, PolicyRepository $policies, PolicyVersionRepository $policyVersions, PolicyService $policyService, AcceptanceRepository $acceptances, InviteRepository $invites, EnrollmentRepository $enrollments, GroupAccessRepository $groupAccess, StudioSettings $settings, PaymentRepository $payments, PaymentService $paymentService, BillingMethodResolver $resolver, RegistrationMailer $registrationMailer, CreditRepository $credits ) {
+		$this->availabilityController         = new AvailabilityController( $availability, $offerings, new WindowValidator( $offerings ) );
+		$this->lessonController               = new LessonController( $bookings, $payments, $availability, $offerings, new LessonDetail( $answers, $questions, $acceptances, $policies, $policyVersions ) );
+		$this->offeringController             = new OfferingController( $offerings, new ClassSlotReconciler( $availability ) );
+		$this->questionController             = new QuestionController( $questions, $offerings );
+		$this->policyController               = new PolicyController( $policies, $policyVersions, $policyService );
+		$this->registrationController         = new RegistrationController( $invites );
+		$this->registrationApprovalController = new RegistrationApprovalController( $registrationMailer );
+		$this->groupClassController           = new GroupClassController( $enrollments, $offerings, $payments, $groupAccess, $paymentService, $invites, $registrationMailer );
+		$this->studentController              = new StudentController( $bookings, $availability, $offerings, $enrollments, $resolver, new StudentHistory( $acceptances, $policies, $policyVersions, $answers, $questions, $payments, $credits ), new StudentActions( $bookings, $availability, $enrollments, $paymentService ) );
+		$this->instructorController           = new InstructorController();
+		$this->settings                       = $settings;
+		$this->accessSettings                 = new AccessSettings();
+		$this->paymentController              = new PaymentController( $payments, $paymentService );
+		$this->paymentReportController        = new PaymentReportController( $payments );
 	}
 
 	public function register(): void {
 		add_action( 'admin_menu', [ $this, 'addPages' ] );
+		add_action( 'admin_enqueue_scripts', [ $this, 'enqueueAssets' ] );
 		add_action( 'admin_post_' . PaymentReportController::EXPORT_ACTION, [ $this->paymentReportController, 'export' ] );
 	}
 
+	/**
+	 * Load a screen's script on that screen only.
+	 *
+	 * @param string $hookSuffix Screen the enqueue is running for.
+	 */
+	public function enqueueAssets( string $hookSuffix ): void {
+		if ( '' === $this->availabilityHook || $hookSuffix !== $this->availabilityHook ) {
+			return;
+		}
+
+		wp_enqueue_script(
+			'us-scheduler-availability-admin',
+			USC_PLUGIN_URL . 'assets/js/availability-admin.js',
+			[],
+			USC_VERSION,
+			true
+		);
+	}
+
 	public function addPages(): void {
 		$this->addStudioSeparators();
 
@@ -82,7 +121,7 @@ class AdminMenu {
 		);
 
 		// Instructor: manage their own availability.
-		add_menu_page(
+		$this->availabilityHook = (string) add_menu_page(
 			__( 'My Availability', 'unsupervised-schedular' ),
 			__( 'My Availability', 'unsupervised-schedular' ),
 			RoleManager::CAP_MANAGE_AVAILABILITY,
@@ -168,6 +207,16 @@ class AdminMenu {
 			35
 		);
 
+		// Studio admin: approve or reject self-signup students (open registration).
+		add_submenu_page(
+			'us-students',
+			__( 'Pending Students', 'unsupervised-schedular' ),
+			__( 'Pending Students', 'unsupervised-schedular' ),
+			RoleManager::CAP_MANAGE_STUDENTS,
+			RegistrationApprovalController::PAGE_SLUG,
+			[ $this->registrationApprovalController, 'renderPage' ]
+		);
+
 		// Studio admin: confirm pending (e-transfer) payments.
 		add_menu_page(
 			__( 'Payments', 'unsupervised-schedular' ),
@@ -215,16 +264,31 @@ class AdminMenu {
 			30.5
 		);
 
-		// Instructor: view their upcoming lessons.
-		add_menu_page(
-			__( 'My Lessons', 'unsupervised-schedular' ),
-			__( 'My Lessons', 'unsupervised-schedular' ),
-			RoleManager::CAP_VIEW_LESSONS,
-			'us-my-lessons',
-			[ $this->lessonController, 'renderInstructorLessons' ],
-			'dashicons-welcome-learn-more',
-			42
-		);
+		// Instructor: view their upcoming lessons. Hidden for anyone who can
+		// already see the Scheduler — it shows every instructor's lessons
+		// (including their own, with the same payment edit forms), so the two
+		// menu items would just duplicate each other for an owner-operator.
+		if ( ! current_user_can( RoleManager::CAP_VIEW_ALL_LESSONS ) ) {
+			add_menu_page(
+				__( 'My Lessons', 'unsupervised-schedular' ),
+				__( 'My Lessons', 'unsupervised-schedular' ),
+				RoleManager::CAP_VIEW_LESSONS,
+				'us-my-lessons',
+				[ $this->lessonController, 'renderInstructorLessons' ],
+				'dashicons-welcome-learn-more',
+				42
+			);
+
+			// Instructor: their own group classes with per-class rosters.
+			add_submenu_page(
+				'us-my-lessons',
+				__( 'My Group Classes', 'unsupervised-schedular' ),
+				__( 'My Group Classes', 'unsupervised-schedular' ),
+				RoleManager::CAP_VIEW_LESSONS,
+				'us-my-group-classes',
+				[ $this->groupClassController, 'renderInstructorPage' ]
+			);
+		}
 	}
 
 	/**

src/Auth/AccessSettings.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Auth;
 
+use Unsupervised\Schedular\Val;
+
 /**
  * Site-owner toggles for whether WordPress administrators automatically receive
  * the studio-admin and/or instructor capabilities.
@@ -39,7 +41,7 @@ class AccessSettings {
 	 * single-account behaviour.
 	 */
 	private function flag( string $option ): bool {
-		return '0' !== (string) get_option( $option, '1' );
+		return '0' !== Val::string( get_option( $option, '1' ) );
 	}
 
 	public function renderPage(): void {

src/Auth/EmailConfirmationHandler.php

@@ -0,0 +1,143 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+use Unsupervised\Schedular\Payment\StudioSettings;
+use Unsupervised\Schedular\Val;
+
+/**
+ * Handles the self-signup email-confirmation link, and keeps WordPress's own
+ * registration form from being used to bypass the studio's policy-accepting
+ * registration page while open registration is enabled.
+ */
+class EmailConfirmationHandler {
+
+	public function __construct(
+		private StudioSettings $settings,
+		private RegistrationMailer $mailer,
+	) {}
+
+	public function register(): void {
+		add_action( 'template_redirect', [ $this, 'maybeConfirm' ] );
+		add_filter( 'register_url', [ $this, 'registerUrl' ] );
+		// login_init fires at the top of wp-login.php for every request (GET form
+		// display AND a direct POST) before any registration processing, so it is
+		// the reliable choke point; registration_errors is a fail-safe in case a
+		// POST ever reaches register_new_user().
+		add_action( 'login_init', [ $this, 'blockNativeRegistration' ] );
+		add_filter( 'registration_errors', [ $this, 'blockRegistrationErrors' ], 10, 1 );
+	}
+
+	/**
+	 * Confirm a self-signup's email when the emailed `?us_confirm=<token>` link
+	 * is opened, then redirect back to the registration page with a result flag.
+	 */
+	public function maybeConfirm(): void {
+		if ( is_admin() ) {
+			return;
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- the token is itself the capability-bearing secret (like a password-reset key); nonces do not apply to an emailed link.
+		$rawToken = sanitize_text_field( Val::string( wp_unslash( $_GET['us_confirm'] ?? '' ) ) );
+		if ( '' === $rawToken ) {
+			return;
+		}
+
+		$base   = $this->registrationPageUrl();
+		$userId = RegistrationStatus::userIdForToken( $rawToken );
+
+		if ( null === $userId || RegistrationStatus::isTokenExpired( $userId, gmdate( 'Y-m-d H:i:s' ) ) ) {
+			wp_safe_redirect( add_query_arg( 'us_confirmed', 'expired', $base ) );
+			exit;
+		}
+
+		RegistrationStatus::confirmEmail( $userId );
+
+		$user = get_user_by( 'id', $userId );
+
+		// Group invite link signups skip the admin review queue: confirming the
+		// email approves the account on the spot, so the student can sign in
+		// immediately instead of waiting for a studio admin.
+		if ( RegistrationStatus::isAutoApprove( $userId ) ) {
+			RegistrationStatus::approve( $userId );
+
+			if ( $user instanceof \WP_User ) {
+				$this->mailer->sendApproved( $user );
+			}
+
+			wp_safe_redirect( add_query_arg( 'us_confirmed', 'ready', $base ) );
+			exit;
+		}
+
+		if ( $user instanceof \WP_User ) {
+			$this->mailer->notifyAdminsPending( $user );
+		}
+
+		wp_safe_redirect( add_query_arg( 'us_confirmed', '1', $base ) );
+		exit;
+	}
+
+	/**
+	 * Point WordPress's own "Register" links at the studio registration page
+	 * while open registration is on and a page is configured.
+	 */
+	public function registerUrl( string $url ): string {
+		if ( ! $this->settings->openRegistrationEnabled() ) {
+			return $url;
+		}
+
+		$pageId = Val::int( get_option( RegistrationController::OPTION_PAGE, 0 ) );
+
+		return $pageId > 0 ? (string) get_permalink( $pageId ) : $url;
+	}
+
+	/**
+	 * Redirect any `wp-login.php?action=register` request (GET or POST) to the
+	 * studio registration page, so the bare native form — which cannot collect
+	 * required policy acceptances — is never used.
+	 */
+	public function blockNativeRegistration(): void {
+		if ( ! $this->settings->openRegistrationEnabled() ) {
+			return;
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only routing decision; no state is changed here.
+		$action = sanitize_key( Val::string( wp_unslash( $_REQUEST['action'] ?? '' ) ) );
+		if ( 'register' !== $action ) {
+			return;
+		}
+
+		$pageId = Val::int( get_option( RegistrationController::OPTION_PAGE, 0 ) );
+		if ( $pageId <= 0 ) {
+			return;
+		}
+
+		wp_safe_redirect( (string) get_permalink( $pageId ) );
+		exit;
+	}
+
+	/**
+	 * Fail-safe: reject any native registration attempt while open registration
+	 * is on, so `register_new_user()` can never create a policy-less account.
+	 *
+	 * @param \WP_Error $errors Accumulated registration errors.
+	 * @return \WP_Error
+	 */
+	public function blockRegistrationErrors( \WP_Error $errors ): \WP_Error {
+		if ( $this->settings->openRegistrationEnabled() ) {
+			$errors->add(
+				'us_registration_redirect',
+				esc_html__( 'Please register on the studio registration page.', 'unsupervised-schedular' )
+			);
+		}
+
+		return $errors;
+	}
+
+	private function registrationPageUrl(): string {
+		$pageId = Val::int( get_option( RegistrationController::OPTION_PAGE, 0 ) );
+
+		return $pageId > 0 ? (string) get_permalink( $pageId ) : home_url( '/' );
+	}
+}

src/Auth/InstructorController.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Auth;
 
+use Unsupervised\Schedular\Val;
+
 /**
  * Studio-admin **Instructors** page: create instructor accounts and toggle each
  * instructor's managed capabilities. Gated on `manage_instructors`. A studio
@@ -24,7 +26,7 @@ class InstructorController {
 		}
 
 		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only instructor selector.
-		$instructorId = absint( $_GET['instructor_id'] ?? 0 );
+		$instructorId = absint( Val::int( $_GET['instructor_id'] ?? 0 ) );
 		$instructor   = $instructorId > 0 ? get_userdata( $instructorId ) : false;
 
 		if ( $instructor && in_array( RoleManager::INSTRUCTOR, (array) $instructor->roles, true ) ) {
@@ -50,12 +52,15 @@ class InstructorController {
 				'email'      => $user->user_email,
 				'registered' => $user->user_registered,
 			],
-			get_users(
-				[
-					'role'    => RoleManager::INSTRUCTOR,
-					'orderby' => 'display_name',
-					'order'   => 'ASC',
-				]
+			array_filter(
+				get_users(
+					[
+						'role'    => RoleManager::INSTRUCTOR,
+						'orderby' => 'display_name',
+						'order'   => 'ASC',
+					]
+				),
+				static fn( mixed $user ): bool => $user instanceof \WP_User
 			)
 		);
 
@@ -66,7 +71,7 @@ class InstructorController {
 	private function handleFormAction(): string {
 		// Nonce is verified by the caller (renderPage) before this method runs.
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$action = sanitize_key( wp_unslash( $_POST['usc_action'] ?? '' ) );
+		$action = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ?? '' ) ) );
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
 
 		if ( 'create' === $action ) {
@@ -82,8 +87,8 @@ class InstructorController {
 
 	private function createInstructor(): string {
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$email = sanitize_email( wp_unslash( $_POST['email'] ?? '' ) );
-		$name  = sanitize_text_field( wp_unslash( $_POST['display_name'] ?? '' ) );
+		$email = sanitize_email( Val::string( wp_unslash( $_POST['email'] ?? '' ) ) );
+		$name  = sanitize_text_field( Val::string( wp_unslash( $_POST['display_name'] ?? '' ) ) );
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
 
 		if ( ! is_email( $email ) ) {
@@ -125,8 +130,9 @@ class InstructorController {
 
 	private function updateCaps(): string {
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$instructorId = absint( $_POST['instructor_id'] ?? 0 );
-		$submitted    = array_map( 'sanitize_key', (array) wp_unslash( $_POST['capabilities'] ?? [] ) );
+		$instructorId = absint( Val::int( $_POST['instructor_id'] ?? 0 ) );
+		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- each capability key is sanitized with sanitize_key() in the array_map callback.
+		$submitted = array_values( array_map( static fn( mixed $cap ): string => sanitize_key( Val::string( $cap ) ), (array) wp_unslash( $_POST['capabilities'] ?? [] ) ) );
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
 
 		$instructor = $instructorId > 0 ? get_userdata( $instructorId ) : false;

src/Auth/Invite.php

@@ -3,12 +3,20 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Auth;
 
+use Unsupervised\Schedular\Val;
+
 class Invite {
 
 	public const STATUS_PENDING  = 'pending';
 	public const STATUS_ACCEPTED = 'accepted';
 	public const STATUS_REVOKED  = 'revoked';
 
+	/** Single-use invite addressed to one email. */
+	public const KIND_PERSONAL = 'personal';
+
+	/** Multi-use shareable link (e.g. for a newsletter) with an explicit expiry. */
+	public const KIND_GROUP = 'group';
+
 	/**
 	 * All valid invite statuses.
 	 *
@@ -22,6 +30,16 @@ class Invite {
 	 */
 	public const EXPIRY_DAYS = 14;
 
+	/**
+	 * Hash a raw invitation token for storage and lookup. Only the hash is
+	 * persisted, so a database leak (backup, SQL injection elsewhere) cannot be
+	 * used to redeem pending invites; the raw token exists only in the emailed
+	 * link and is shown to the admin once, at creation.
+	 */
+	public static function hashToken( string $rawToken ): string {
+		return hash( 'sha256', $rawToken );
+	}
+
 	public function __construct(
 		public readonly string $email,
 		public readonly string $token,
@@ -31,40 +49,61 @@ class Invite {
 		public readonly ?int $acceptedUserId = null,
 		public readonly ?string $acceptedAt = null,
 		public readonly ?string $createdAt = null,
+		public readonly string $kind = self::KIND_PERSONAL,
+		public readonly ?string $expiresAt = null,
+		public readonly ?int $offeringId = null,
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			email:          $row->email,
-			token:          $row->token,
-			role:           $row->role,
-			status:         $row->status,
-			invitedBy:      null !== $row->invited_by ? (int) $row->invited_by : null,
-			acceptedUserId: null !== $row->accepted_user_id ? (int) $row->accepted_user_id : null,
-			acceptedAt:     $row->accepted_at,
-			createdAt:      $row->created_at ?? null,
-			id:             (int) $row->id,
+			email:          Val::string( $row->email ),
+			token:          Val::string( $row->token ),
+			role:           Val::string( $row->role ),
+			status:         Val::string( $row->status ),
+			invitedBy:      Val::intOrNull( $row->invited_by ),
+			acceptedUserId: Val::intOrNull( $row->accepted_user_id ),
+			acceptedAt:     Val::stringOrNull( $row->accepted_at ),
+			createdAt:      Val::stringOrNull( $row->created_at ?? null ),
+			kind:           '' !== Val::string( $row->kind ?? '' ) ? Val::string( $row->kind ) : self::KIND_PERSONAL,
+			expiresAt:      Val::stringOrNull( $row->expires_at ?? null ),
+			offeringId:     Val::intOrNull( $row->offering_id ?? null ),
+			id:             Val::int( $row->id ),
 		);
 	}
 
+	public function isGroup(): bool {
+		return self::KIND_GROUP === $this->kind;
+	}
+
 	public function isPending(): bool {
 		return self::STATUS_PENDING === $this->status;
 	}
 
 	/**
-	 * Whether the invite was created more than {@see EXPIRY_DAYS} ago, measured
-	 * against the supplied current `Y-m-d H:i:s` timestamp. An invite with no
-	 * known creation time is treated as not expired.
+	 * Whether the invite has expired, measured against the supplied current
+	 * `Y-m-d H:i:s` timestamp. An explicit `expires_at` (set on every group
+	 * link) wins; otherwise a personal invite expires {@see EXPIRY_DAYS} after
+	 * creation. An invite with neither timestamp is treated as not expired.
 	 */
 	public function isExpired( string $now ): bool {
+		$current = strtotime( $now );
+		if ( false === $current ) {
+			return false;
+		}
+
+		if ( null !== $this->expiresAt ) {
+			$expires = strtotime( $this->expiresAt );
+
+			return false !== $expires && $current > $expires;
+		}
+
 		if ( null === $this->createdAt ) {
 			return false;
 		}
 
 		$created = strtotime( $this->createdAt );
-		$current = strtotime( $now );
-		if ( false === $created || false === $current ) {
+		if ( false === $created ) {
 			return false;
 		}
 
@@ -89,10 +128,13 @@ class Invite {
 			'email'            => $this->email,
 			'token'            => $this->token,
 			'role'             => $this->role,
+			'kind'             => $this->kind,
 			'status'           => $this->status,
 			'invited_by'       => $this->invitedBy,
 			'accepted_user_id' => $this->acceptedUserId,
 			'accepted_at'      => $this->acceptedAt,
+			'expires_at'       => $this->expiresAt,
+			'offering_id'      => $this->offeringId,
 		];
 	}
 }

src/Auth/InviteRepository.php

@@ -11,28 +11,35 @@ class InviteRepository {
 		$this->table = $db->prefix . 'us_invites';
 	}
 
+	/**
+	 * Persist an invite. Returns the new row id, or 0 when the insert failed —
+	 * callers must not hand out a registration link for an unstored token.
+	 */
 	public function insert( Invite $invite ): int {
-		$this->db->insert(
+		$result = $this->db->insert(
 			$this->table,
 			[
 				'email'            => $invite->email,
 				'token'            => $invite->token,
 				'role'             => $invite->role,
+				'kind'             => $invite->kind,
+				'offering_id'      => $invite->offeringId,
 				'status'           => $invite->status,
 				'invited_by'       => $invite->invitedBy,
 				'accepted_user_id' => $invite->acceptedUserId,
 				'created_at'       => current_time( 'mysql' ),
 				'accepted_at'      => $invite->acceptedAt,
+				'expires_at'       => $invite->expiresAt,
 			],
-			[ '%s', '%s', '%s', '%s', '%d', '%d', '%s', '%s' ]
+			[ '%s', '%s', '%s', '%s', '%d', '%s', '%d', '%d', '%s', '%s', '%s' ]
 		);
 
-		return $this->db->insert_id;
+		return false === $result ? 0 : $this->db->insert_id;
 	}
 
 	public function findByToken( string $token ): ?Invite {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE token = %s", $token )
+			$this->db->prepare( 'SELECT * FROM %i WHERE token = %s', $this->table, $token )
 		);
 
 		return $row ? Invite::fromRow( $row ) : null;
@@ -40,7 +47,7 @@ class InviteRepository {
 
 	public function findById( int $id ): ?Invite {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE id = %d", $id )
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
 		);
 
 		return $row ? Invite::fromRow( $row ) : null;
@@ -52,7 +59,8 @@ class InviteRepository {
 	public function findPendingByEmail( string $email ): ?Invite {
 		$row = $this->db->get_row(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE email = %s AND status = %s ORDER BY id DESC LIMIT 1",
+				'SELECT * FROM %i WHERE email = %s AND status = %s ORDER BY id DESC LIMIT 1',
+				$this->table,
 				$email,
 				Invite::STATUS_PENDING
 			)
@@ -69,7 +77,8 @@ class InviteRepository {
 	public function findPending(): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE status = %s ORDER BY created_at DESC",
+				'SELECT * FROM %i WHERE status = %s ORDER BY created_at DESC',
+				$this->table,
 				Invite::STATUS_PENDING
 			)
 		);

src/Auth/LoginPage.php

@@ -3,32 +3,36 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Auth;
 
+use Unsupervised\Schedular\Val;
+
 class LoginPage {
 
 	/**
-	 * Renders the student login shortcode output.
+	 * Renders the student login shortcode/block output.
 	 *
-	 * @param array<string, string> $atts Shortcode attributes (unused — reserved for future options).
+	 * @param array<int|string, mixed> $atts Block attributes (`bookingPageId`) or
+	 *                                       shortcode attributes (`booking_page_id`).
 	 */
-	public function render( array $atts ): string { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.Found
+	public function render( array $atts ): string {
+		$bookingPageId = Val::int( $atts['bookingPageId'] ?? $atts['booking_page_id'] ?? 0 );
+
 		if ( is_user_logged_in() ) {
-			$redirect = esc_url( (string) get_permalink() );
 			return sprintf(
 				'<p>%s <a href="%s">%s</a>.</p>',
 				esc_html__( 'You are already logged in.', 'unsupervised-schedular' ),
-				$redirect,
+				esc_url( $this->bookingUrl( $bookingPageId ) ?? (string) get_permalink() ),
 				esc_html__( 'View available lessons', 'unsupervised-schedular' )
 			);
 		}
 
 		$error    = '';
-		$redirect = sanitize_url( (string) get_permalink() );
+		$redirect = sanitize_url( $this->bookingUrl( $bookingPageId ) ?? (string) get_permalink() );
 
 		if ( isset( $_POST['us_login'] ) && check_admin_referer( 'us_student_login' ) ) {
 			$credentials = [
-				'user_login'    => sanitize_user( wp_unslash( $_POST['log'] ?? '' ) ),
+				'user_login'    => sanitize_user( Val::string( wp_unslash( $_POST['log'] ?? '' ) ) ),
 				// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- passwords must not be sanitized.
-				'user_password' => wp_unslash( $_POST['pwd'] ?? '' ),
+				'user_password' => Val::string( wp_unslash( $_POST['pwd'] ?? '' ) ),
 				'remember'      => isset( $_POST['rememberme'] ),
 			];
 
@@ -46,4 +50,19 @@ class LoginPage {
 		include USC_PLUGIN_DIR . 'templates/frontend/login-page.php';
 		return (string) ob_get_clean();
 	}
+
+	/**
+	 * Permalink of the configured booking page, or null when no page is
+	 * chosen (or the chosen page no longer exists). Logged-in visitors are
+	 * linked (and redirected after login) there instead of the current page.
+	 */
+	public function bookingUrl( int $bookingPageId ): ?string {
+		if ( $bookingPageId <= 0 ) {
+			return null;
+		}
+
+		$url = get_permalink( $bookingPageId );
+
+		return is_string( $url ) ? $url : null;
+	}
 }

src/Auth/RegistrationApprovalController.php

@@ -0,0 +1,102 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+use Unsupervised\Schedular\Val;
+
+/**
+ * Admin page (Students → Pending Students) for reviewing self-signup accounts:
+ * approve a confirmed applicant into a full student, or reject (delete) them.
+ * Only relevant while open registration is enabled.
+ */
+class RegistrationApprovalController {
+
+	public const PAGE_SLUG    = 'us-pending-students';
+	public const NONCE_ACTION = 'usc_registration_approval';
+
+	public function __construct( private RegistrationMailer $mailer ) {}
+
+	public function renderPage(): void {
+		if ( ! current_user_can( RoleManager::CAP_MANAGE_STUDENTS ) ) {
+			wp_die( esc_html__( 'You do not have permission to manage student registrations.', 'unsupervised-schedular' ) );
+		}
+
+		if ( isset( $_POST['usc_action'] ) && check_admin_referer( self::NONCE_ACTION ) ) {
+			$this->handleAction();
+		}
+
+		$awaitingApproval     = [];
+		$awaitingConfirmation = [];
+		foreach ( $this->pendingUsers() as $user ) {
+			if ( RegistrationStatus::emailConfirmed( (int) $user->ID ) ) {
+				$awaitingApproval[] = $user;
+			} else {
+				$awaitingConfirmation[] = $user;
+			}
+		}
+
+		include USC_PLUGIN_DIR . 'templates/admin/registrations.php';
+	}
+
+	/**
+	 * Approve or reject the posted user. Approval clears the pending flags and
+	 * emails the student; rejection emails them, then hard-deletes the account so
+	 * the email is freed to re-apply.
+	 */
+	private function handleAction(): void {
+		// Nonce is verified by the caller (renderPage) before this method runs.
+		// phpcs:disable WordPress.Security.NonceVerification.Missing
+		$action = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ?? '' ) ) );
+		$userId = absint( Val::int( $_POST['user_id'] ?? 0 ) );
+		// phpcs:enable WordPress.Security.NonceVerification.Missing
+
+		if ( $userId <= 0 || ! RegistrationStatus::isAwaitingApproval( $userId ) ) {
+			return;
+		}
+
+		if ( 'approve' === $action ) {
+			RegistrationStatus::approve( $userId );
+			$user = get_user_by( 'id', $userId );
+			if ( $user instanceof \WP_User ) {
+				$this->mailer->sendApproved( $user );
+			}
+			return;
+		}
+
+		if ( 'reject' === $action ) {
+			$user  = get_user_by( 'id', $userId );
+			$email = $user instanceof \WP_User ? (string) $user->user_email : '';
+			if ( '' !== $email ) {
+				$this->mailer->sendRejected( $email );
+			}
+
+			if ( ! function_exists( 'wp_delete_user' ) ) {
+				require_once ABSPATH . 'wp-admin/includes/user.php';
+			}
+			wp_delete_user( $userId );
+		}
+	}
+
+	/**
+	 * Every account still awaiting approval (confirmed or not).
+	 *
+	 * @return list<\WP_User>
+	 */
+	private function pendingUsers(): array {
+		return array_values(
+			array_filter(
+				get_users(
+					[
+						'meta_key' => RegistrationStatus::META_AWAITING_APPROVAL, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
+					'meta_value'   => '1', // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
+					'number'       => 500,
+					'orderby'      => 'user_registered',
+					'order'        => 'ASC',
+					]
+				),
+				static fn( mixed $user ): bool => $user instanceof \WP_User
+			)
+		);
+	}
+}

src/Auth/RegistrationController.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Auth;
 
+use Unsupervised\Schedular\Val;
+
 class RegistrationController {
 
 	/**
@@ -17,50 +19,132 @@ class RegistrationController {
 			wp_die( esc_html__( 'You do not have permission to manage invites.', 'unsupervised-schedular' ) );
 		}
 
+		$newInviteUrl = '';
+		$inviteError  = '';
 		if ( isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_invite_action' ) ) {
-			$this->handleFormAction();
+			[ $newInviteUrl, $inviteError ] = $this->handleFormAction();
 		}
 
 		$pendingInvites      = $this->invites->findPending();
-		$registrationPageId  = (int) get_option( self::OPTION_PAGE, 0 );
+		$registrationPageId  = Val::int( get_option( self::OPTION_PAGE, 0 ) );
 		$registrationPageUrl = $registrationPageId > 0 ? (string) get_permalink( $registrationPageId ) : '';
 
 		include USC_PLUGIN_DIR . 'templates/admin/invites.php';
 	}
 
-	private function handleFormAction(): void {
+	/**
+	 * Handle a posted admin action. Returns `[link, error]`: the registration
+	 * link for a freshly created invite — the only time it can be shown, since
+	 * just the token's hash is stored — or an error message when creation
+	 * failed; both empty for every other action.
+	 *
+	 * @return array{string, string}
+	 */
+	private function handleFormAction(): array {
 		// Nonce is verified by the caller (renderPage) before this method runs.
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$action = sanitize_key( wp_unslash( $_POST['usc_action'] ?? '' ) );
+		$action = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ?? '' ) ) );
 
 		if ( 'set_page' === $action ) {
-			update_option( self::OPTION_PAGE, absint( $_POST['registration_page_id'] ?? 0 ) );
+			update_option( self::OPTION_PAGE, absint( Val::int( $_POST['registration_page_id'] ?? 0 ) ) );
 		}
 
 		if ( 'invite' === $action ) {
-			$email = sanitize_email( wp_unslash( $_POST['email'] ?? '' ) );
+			$email = sanitize_email( Val::string( wp_unslash( $_POST['email'] ?? '' ) ) );
 
 			if (
-				is_email( $email )
-				&& false === email_exists( $email )
-				&& null === $this->invites->findPendingByEmail( $email )
+				! is_email( $email )
+				|| false !== email_exists( $email )
+				|| null !== $this->invites->findPendingByEmail( $email )
 			) {
-				$this->invites->insert(
-					new Invite(
-						email:     $email,
-						token:     wp_generate_password( 32, false ),
-						invitedBy: get_current_user_id(),
-					)
-				);
+				return [ '', esc_html__( 'Could not create the invite: enter a valid email address that has no account and no pending invite.', 'unsupervised-schedular' ) ];
 			}
+
+			$rawToken = wp_generate_password( 32, false );
+
+			$id = $this->invites->insert(
+				new Invite(
+					email:     $email,
+					token:     Invite::hashToken( $rawToken ),
+					invitedBy: get_current_user_id(),
+				)
+			);
+
+			return $this->linkOrError( $id, $rawToken );
+		}
+
+		if ( 'group_invite' === $action ) {
+			$expiresAt = $this->normalizeExpiry( sanitize_text_field( Val::string( wp_unslash( $_POST['expires_at'] ?? '' ) ) ) );
+
+			if ( null === $expiresAt ) {
+				return [ '', esc_html__( 'Could not create the group link: choose an expiry date of today or later.', 'unsupervised-schedular' ) ];
+			}
+
+			$rawToken = wp_generate_password( 32, false );
+
+			$id = $this->invites->insert(
+				new Invite(
+					email:     '',
+					token:     Invite::hashToken( $rawToken ),
+					invitedBy: get_current_user_id(),
+					kind:      Invite::KIND_GROUP,
+					expiresAt: $expiresAt,
+				)
+			);
+
+			return $this->linkOrError( $id, $rawToken );
 		}
 
 		if ( 'revoke' === $action ) {
-			$inviteId = absint( $_POST['invite_id'] ?? 0 );
+			$inviteId = absint( Val::int( $_POST['invite_id'] ?? 0 ) );
 			if ( $inviteId > 0 ) {
 				$this->invites->revoke( $inviteId );
 			}
 		}
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
+
+		return [ '', '' ];
+	}
+
+	/**
+	 * The registration link for a stored invite, or an error when the insert
+	 * failed — a link must never be shown for a token that was not persisted,
+	 * since it could only ever dead-end as "invalid or expired".
+	 *
+	 * @return array{string, string}
+	 */
+	private function linkOrError( int $insertedId, string $rawToken ): array {
+		if ( $insertedId <= 0 ) {
+			return [ '', esc_html__( 'Could not save the invite. Deactivate and reactivate the plugin to update the database, then try again.', 'unsupervised-schedular' ) ];
+		}
+
+		return [ $this->registrationLink( $rawToken ), '' ];
+	}
+
+	/**
+	 * Validate a submitted group-link expiry date (strict `Y-m-d`, today or
+	 * later) and expand it to the end of that day; null when invalid or past.
+	 */
+	private function normalizeExpiry( string $date ): ?string {
+		$day = \DateTimeImmutable::createFromFormat( '!Y-m-d', $date );
+		if ( false === $day || $day->format( 'Y-m-d' ) !== $date ) {
+			return null;
+		}
+
+		if ( $date < Val::string( current_time( 'Y-m-d' ) ) ) {
+			return null;
+		}
+
+		return $date . ' 23:59:59';
+	}
+
+	/**
+	 * Build the registration URL for a raw invite token.
+	 */
+	private function registrationLink( string $rawToken ): string {
+		$pageId   = Val::int( get_option( self::OPTION_PAGE, 0 ) );
+		$linkBase = $pageId > 0 ? (string) get_permalink( $pageId ) : '';
+
+		return add_query_arg( 'us_invite', rawurlencode( $rawToken ), '' !== $linkBase ? $linkBase : home_url( '/' ) );
 	}
 }

src/Auth/RegistrationLoginGate.php

@@ -0,0 +1,61 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+/**
+ * Enforces the pending state of self-signup accounts:
+ * - an account whose email is not yet confirmed cannot log in at all;
+ * - a confirmed-but-unapproved account may log in, but its booking capability
+ *   is withheld so it only reaches the "awaiting approval" screen.
+ *
+ * Both checks key solely off the pending user meta, so invite- and
+ * admin-created students (which carry none of it) are unaffected.
+ */
+class RegistrationLoginGate {
+
+	public function register(): void {
+		add_filter( 'wp_authenticate_user', [ $this, 'blockUnconfirmed' ], 10, 1 );
+		add_filter( 'user_has_cap', [ $this, 'withholdBookingWhilePending' ], 10, 4 );
+	}
+
+	/**
+	 * Block authentication for a self-signup that has not yet confirmed its
+	 * email. Runs after password verification.
+	 *
+	 * @param \WP_User|\WP_Error $user Authenticating user, or an earlier error.
+	 * @return \WP_User|\WP_Error
+	 */
+	public function blockUnconfirmed( $user ) {
+		if (
+			$user instanceof \WP_User
+			&& RegistrationStatus::isAwaitingApproval( (int) $user->ID )
+			&& ! RegistrationStatus::emailConfirmed( (int) $user->ID )
+		) {
+			return new \WP_Error(
+				'us_email_unconfirmed',
+				esc_html__( 'Please confirm your email address before logging in — check your inbox for the confirmation link.', 'unsupervised-schedular' )
+			);
+		}
+
+		return $user;
+	}
+
+	/**
+	 * Strip the booking capability from any account still awaiting approval, so a
+	 * confirmed-but-unapproved student cannot book until a studio admin approves.
+	 *
+	 * @param array<string, bool> $allcaps All capabilities currently held.
+	 * @param array<int, string>  $caps    Required capabilities (unused).
+	 * @param array<int, mixed>   $args    Callback args (unused).
+	 * @param mixed               $user    The user being checked (a WP_User in practice).
+	 * @return array<string, bool>
+	 */
+	public function withholdBookingWhilePending( array $allcaps, array $caps, array $args, mixed $user ): array {
+		if ( $user instanceof \WP_User && RegistrationStatus::isAwaitingApproval( (int) $user->ID ) ) {
+			unset( $allcaps[ RoleManager::CAP_BOOK_LESSON ] );
+		}
+
+		return $allcaps;
+	}
+}

src/Auth/RegistrationMailer.php

@@ -0,0 +1,163 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+use Unsupervised\Schedular\Val;
+
+/**
+ * Transactional emails for the self-approval registration flow: the email
+ * confirmation link, the studio-admin heads-up that someone is ready to
+ * approve, and the approval / rejection notices to the student.
+ */
+class RegistrationMailer {
+
+	/**
+	 * Email the new student a link to confirm their address. Returns false when
+	 * there is no recipient.
+	 */
+	public function sendConfirmation( \WP_User $user, string $confirmUrl ): bool {
+		if ( '' === (string) $user->user_email ) {
+			return false;
+		}
+
+		$subject = sprintf(
+			/* translators: %s: site name */
+			__( 'Confirm your email for %s', 'unsupervised-schedular' ),
+			$this->siteName()
+		);
+
+		$body = sprintf(
+			/* translators: 1: site name, 2: confirmation URL */
+			__( "Thanks for signing up at %1\$s.\n\nPlease confirm your email address by opening this link:\n%2\$s\n\nOnce confirmed, a studio admin will review and approve your account. You'll get another email when it's ready.", 'unsupervised-schedular' ),
+			$this->siteName(),
+			$confirmUrl
+		);
+
+		return (bool) wp_mail( $user->user_email, $subject, $body );
+	}
+
+	/**
+	 * Tell the studio admins a self-signup has confirmed their email and is
+	 * waiting for approval. Sent to the site admin email.
+	 */
+	public function notifyAdminsPending( \WP_User $user ): bool {
+		$adminEmail = Val::string( get_option( 'admin_email', '' ) );
+		if ( '' === $adminEmail ) {
+			return false;
+		}
+
+		$subject = __( 'A new student is awaiting approval', 'unsupervised-schedular' );
+		$body    = sprintf(
+			/* translators: 1: student name, 2: student email */
+			__( "%1\$s (%2\$s) has confirmed their email and is awaiting approval.\n\nReview them under Students → Pending Students in wp-admin.", 'unsupervised-schedular' ),
+			(string) $user->display_name,
+			(string) $user->user_email
+		);
+
+		return (bool) wp_mail( $adminEmail, $subject, $body );
+	}
+
+	/**
+	 * Tell the student their account has been approved. Returns false when there
+	 * is no recipient.
+	 */
+	public function sendApproved( \WP_User $user ): bool {
+		if ( '' === (string) $user->user_email ) {
+			return false;
+		}
+
+		$subject = sprintf(
+			/* translators: %s: site name */
+			__( 'Your %s account is approved', 'unsupervised-schedular' ),
+			$this->siteName()
+		);
+		$body = sprintf(
+			/* translators: 1: site name, 2: login URL */
+			__( "Good news — your account at %1\$s has been approved. You can now log in and book:\n%2\$s", 'unsupervised-schedular' ),
+			$this->siteName(),
+			wp_login_url()
+		);
+
+		return (bool) wp_mail( $user->user_email, $subject, $body );
+	}
+
+	/**
+	 * Tell an applicant their registration was declined. Takes the email address
+	 * directly, since the account is deleted as part of rejection.
+	 */
+	public function sendRejected( string $email ): bool {
+		if ( '' === $email ) {
+			return false;
+		}
+
+		$subject = sprintf(
+			/* translators: %s: site name */
+			__( 'Your %s registration', 'unsupervised-schedular' ),
+			$this->siteName()
+		);
+		$body = sprintf(
+			/* translators: %s: site name */
+			__( 'Thank you for your interest in %s. We are unable to approve your registration at this time. Please contact the studio if you have any questions.', 'unsupervised-schedular' ),
+			$this->siteName()
+		);
+
+		return (bool) wp_mail( $email, $subject, $body );
+	}
+
+	/**
+	 * Tell a registered student they have been given access to an invite-only
+	 * group class and can now enrol. Returns false when there is no recipient.
+	 */
+	public function sendClassAccessGranted( \WP_User $user, string $className ): bool {
+		if ( '' === (string) $user->user_email ) {
+			return false;
+		}
+
+		$subject = sprintf(
+			/* translators: %s: class title */
+			__( 'You have been invited to %s', 'unsupervised-schedular' ),
+			$className
+		);
+		$body = sprintf(
+			/* translators: 1: class title, 2: site name, 3: login URL */
+			__( "You have been given access to the group class \"%1\$s\" at %2\$s.\n\nLog in and open the group classes page to enrol:\n%3\$s", 'unsupervised-schedular' ),
+			$className,
+			$this->siteName(),
+			wp_login_url()
+		);
+
+		return (bool) wp_mail( $user->user_email, $subject, $body );
+	}
+
+	/**
+	 * Email a tokenised registration link to someone invited to a group class who
+	 * does not yet have an account. Returns false when there is no recipient.
+	 */
+	public function sendClassInvite( string $email, string $link, string $className ): bool {
+		if ( '' === $email ) {
+			return false;
+		}
+
+		$subject = sprintf(
+			/* translators: %s: class title */
+			__( 'You are invited to join %s', 'unsupervised-schedular' ),
+			$className
+		);
+		$body = sprintf(
+			/* translators: 1: class title, 2: site name, 3: registration URL */
+			__( "You have been invited to the group class \"%1\$s\" at %2\$s.\n\nCreate your account using this link, then choose to enrol in the class:\n%3\$s", 'unsupervised-schedular' ),
+			$className,
+			$this->siteName(),
+			$link
+		);
+
+		return (bool) wp_mail( $email, $subject, $body );
+	}
+
+	private function siteName(): string {
+		$name = (string) get_bloginfo( 'name' );
+
+		return '' !== $name ? $name : __( 'the studio', 'unsupervised-schedular' );
+	}
+}

src/Auth/RegistrationPage.php

@@ -3,55 +3,201 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Auth;
 
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
+use Unsupervised\Schedular\Payment\StudioSettings;
 use Unsupervised\Schedular\Policy\AcceptanceRepository;
 use Unsupervised\Schedular\Policy\Policy;
 use Unsupervised\Schedular\Policy\PolicyAcceptance;
 use Unsupervised\Schedular\Policy\PolicyRepository;
 use Unsupervised\Schedular\Policy\PolicyVersionRepository;
+use Unsupervised\Schedular\Registration\Answer;
+use Unsupervised\Schedular\Registration\AnswerRepository;
+use Unsupervised\Schedular\Registration\Question;
+use Unsupervised\Schedular\Registration\QuestionRepository;
+use Unsupervised\Schedular\Val;
 
 class RegistrationPage {
 
+	/** Success signal: an invited student was created and logged in. */
+	private const RESULT_INVITE = 'invite';
+
+	/** Success signal: a self-signup was created and must confirm their email. */
+	private const RESULT_CONFIRM = 'confirm';
+
+	/**
+	 * Success signal: a group-link signup was created and must confirm their
+	 * email — confirming approves the account immediately (no admin review).
+	 */
+	private const RESULT_CONFIRM_GROUP = 'confirm_group';
+
+	/**
+	 * Validation error from the most recent submission processed on
+	 * `template_redirect`, carried over to {@see render()} so it can be shown
+	 * inline with the form. Empty when the last submit succeeded or none ran.
+	 */
+	private string $submitError = '';
+
 	public function __construct(
 		private InviteRepository $invites,
 		private PolicyRepository $policies,
 		private PolicyVersionRepository $versions,
 		private AcceptanceRepository $acceptances,
+		private StudioSettings $settings,
+		private RegistrationMailer $mailer,
+		private QuestionRepository $questions,
+		private AnswerRepository $answers,
+		private GroupAccessRepository $access,
 	) {}
 
 	/**
 	 * Renders the student registration shortcode output.
 	 *
-	 * @param array<string, string> $atts Shortcode attributes (unused — reserved for future options).
+	 * @param array<int|string, mixed> $atts Block attributes (`loginPageId`,
+	 *                                       `inviteOnlyMessage`) or shortcode
+	 *                                       attributes (`login_page_id`,
+	 *                                       `invite_only_message`).
 	 */
-	public function render( array $atts ): string { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.Found
+	public function render( array $atts ): string {
+		// A just-completed invite signup is redirected back here already logged
+		// in (see maybeHandleSubmit); its success flag distinguishes that from a
+		// visitor who simply happens to be signed in already.
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only display flag; the submit that set it was nonce-checked.
+		$registered = sanitize_key( Val::string( wp_unslash( $_GET['us_registered'] ?? '' ) ) );
+
 		if ( is_user_logged_in() ) {
-			return '<p>' . esc_html__( 'You already have an account and are logged in.', 'unsupervised-schedular' ) . '</p>';
-		}
+			// Both logged-in outcomes are dead ends without somewhere to go next,
+			// so both offer the same "continue" link to the configured page.
+			wp_enqueue_style( 'us-scheduler' );
+			$link = $this->continueLink( $atts );
 
-		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- token identifies the invite; the form submit is nonce-checked below.
-		$token  = sanitize_text_field( wp_unslash( $_REQUEST['us_invite'] ?? '' ) );
-		$invite = '' !== $token ? $this->invites->findByToken( $token ) : null;
-
-		$error   = '';
-		$success = false;
-
-		if ( isset( $_POST['us_register'] ) && check_admin_referer( 'us_student_register' ) ) {
-			$result = $this->handleSubmit( $invite );
-			if ( true === $result ) {
-				$success = true;
-			} else {
-				$error = $result;
+			if ( self::RESULT_INVITE === $registered ) {
+				// An invited student is done the moment they land here logged in.
+				return '<div class="us-register-form"><p class="us-success">'
+					. esc_html__( 'Your account has been created and you are now logged in.', 'unsupervised-schedular' )
+					. '</p>' . $link . '</div>';
 			}
+
+			return '<div class="us-register-form"><p>'
+				. esc_html__( 'You already have an account and are logged in.', 'unsupervised-schedular' )
+				. '</p>' . $link . '</div>';
 		}
 
-		$policyForms = $this->signupPolicies();
-		$canRegister = null !== $invite && $invite->isAcceptable( current_time( 'mysql' ) );
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- token identifies the invite; the form submit is nonce-checked in maybeHandleSubmit.
+		$token = sanitize_text_field( Val::string( wp_unslash( $_REQUEST['us_invite'] ?? '' ) ) );
+		// Only the token's hash is stored, so hash the submitted token for lookup.
+		$invite = '' !== $token ? $this->invites->findByToken( Invite::hashToken( $token ) ) : null;
+		$open   = $this->settings->openRegistrationEnabled();
+
+		// Only a redeemable invite fixes the form's email to the invited address.
+		// A stale token (expired / accepted / revoked) with open registration on
+		// must fall back to the normal editable email field, not show — and then
+		// fail to submit — the stale invite's address.
+		$inviteValid = null !== $invite && $invite->isAcceptable( current_time( 'mysql' ) );
+
+		// The submission itself is processed in maybeHandleSubmit on
+		// template_redirect (before any output), so the invite auto-login cookie
+		// is actually sent. Its success signal returns here as ?us_registered;
+		// only a validation error is carried on the instance to show inline.
+		$successType = in_array( $registered, [ self::RESULT_CONFIRM, self::RESULT_CONFIRM_GROUP ], true ) ? $registered : '';
+		$error       = $this->submitError;
+
+		// Result of an email-confirmation link (set by EmailConfirmationHandler's redirect).
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only display flag, not a state change.
+		$confirmResult = sanitize_key( Val::string( wp_unslash( $_GET['us_confirmed'] ?? '' ) ) );
+
+		// Where the post-confirmation prompt sends students to sign in.
+		$loginUrl = $this->loginUrl( $this->successPageId( $atts ) );
+
+		$policyForms       = $this->signupPolicies();
+		$accountQuestions  = $this->questions->findByScope( Question::SCOPE_ACCOUNT, activeOnly: true );
+		$canRegister       = $open || $inviteValid;
+		$inviteOnlyMessage = $this->inviteOnlyMessage( $atts );
+
+		// The signup form carries the same policy-acceptance markup as the booking
+		// gate, so it needs the plugin stylesheet that formats it.
+		wp_enqueue_style( 'us-scheduler' );
+
+		// The two-step script only matters when there is a second step to reveal.
+		if ( $canRegister && '' === $successType && [] !== $accountQuestions ) {
+			wp_enqueue_script( 'us-scheduler-register' );
+		}
 
 		ob_start();
 		include USC_PLUGIN_DIR . 'templates/frontend/register-page.php';
 		return (string) ob_get_clean();
 	}
 
+	/**
+	 * Process a submitted registration on `template_redirect`, before any page
+	 * output. Running here (rather than inside {@see render()}, which fires
+	 * during `the_content` after headers are sent) is what lets the invite
+	 * branch's `wp_set_auth_cookie()` actually persist — otherwise the student
+	 * appears logged in for a single render and is logged out on the next view.
+	 *
+	 * On success the request is redirected (post/redirect/get) with a
+	 * `?us_registered` flag so a refresh cannot resubmit; a validation error is
+	 * stashed for {@see render()} to show inline with the form.
+	 */
+	public function maybeHandleSubmit(): void {
+		if ( ! isset( $_POST['us_register'] ) || is_user_logged_in() ) {
+			return;
+		}
+
+		if ( ! check_admin_referer( 'us_student_register' ) ) {
+			return;
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Missing -- verified by check_admin_referer above.
+		$token  = sanitize_text_field( Val::string( wp_unslash( $_REQUEST['us_invite'] ?? '' ) ) );
+		$invite = '' !== $token ? $this->invites->findByToken( Invite::hashToken( $token ) ) : null;
+		$open   = $this->settings->openRegistrationEnabled();
+
+		$result = $this->handleSubmit( $invite, $open );
+
+		if ( in_array( $result, [ self::RESULT_INVITE, self::RESULT_CONFIRM, self::RESULT_CONFIRM_GROUP ], true ) ) {
+			$this->redirect( add_query_arg( 'us_registered', $result, $this->currentUrl() ) );
+			return;
+		}
+
+		$this->submitError = $result;
+	}
+
+	/**
+	 * The current page's clean permalink, used as the post/redirect/get target
+	 * so the invite token and any stale flags are dropped from the URL.
+	 */
+	private function currentUrl(): string {
+		$url = get_permalink();
+
+		return is_string( $url ) ? $url : home_url( '/' );
+	}
+
+	/**
+	 * Issues the post-submit redirect and stops the request. Split out so tests
+	 * can observe the target without the process exiting.
+	 */
+	protected function redirect( string $url ): void {
+		wp_safe_redirect( $url );
+		exit;
+	}
+
+	/**
+	 * The message shown when registration is closed and no valid invite is
+	 * present. Studios can override the default via the block
+	 * (`inviteOnlyMessage`) or shortcode (`invite_only_message`) attribute.
+	 *
+	 * @param array<int|string, mixed> $atts
+	 */
+	private function inviteOnlyMessage( array $atts ): string {
+		$custom = trim( Val::string( $atts['inviteOnlyMessage'] ?? $atts['invite_only_message'] ?? '' ) );
+
+		if ( '' !== $custom ) {
+			return $custom;
+		}
+
+		return esc_html__( 'Registration is by invitation only. Please use the link from your invitation email, or contact the studio.', 'unsupervised-schedular' );
+	}
+
 	/**
 	 * Redirect to the configured registration page when an invite token lands
 	 * elsewhere (e.g. a link generated before the page was selected). Hooked on
@@ -63,12 +209,12 @@ class RegistrationPage {
 		}
 
 		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only token used only to build the redirect target.
-		$token = sanitize_text_field( wp_unslash( $_GET['us_invite'] ?? '' ) );
+		$token = sanitize_text_field( Val::string( wp_unslash( $_GET['us_invite'] ?? '' ) ) );
 		if ( '' === $token ) {
 			return;
 		}
 
-		$pageId = (int) get_option( RegistrationController::OPTION_PAGE, 0 );
+		$pageId = Val::int( get_option( RegistrationController::OPTION_PAGE, 0 ) );
 		if ( $pageId <= 0 || is_page( $pageId ) ) {
 			return;
 		}
@@ -78,26 +224,44 @@ class RegistrationPage {
 	}
 
 	/**
-	 * Process the submitted registration. Returns true on success or an error
-	 * message string on failure.
+	 * Process the submitted registration. Returns a success signal
+	 * ({@see RESULT_INVITE} or {@see RESULT_CONFIRM}) or an error message string
+	 * on failure.
+	 *
+	 * The invite branch is tried first, so an invited student always completes
+	 * signup regardless of whether open registration is enabled.
 	 */
-	private function handleSubmit( ?Invite $invite ): string|bool {
-		if ( null === $invite || ! $invite->isAcceptable( current_time( 'mysql' ) ) ) {
+	private function handleSubmit( ?Invite $invite, bool $open ): string {
+		$inviteValid = null !== $invite && $invite->isAcceptable( current_time( 'mysql' ) );
+
+		if ( ! $inviteValid && ! $open ) {
 			return esc_html__( 'This invitation is invalid, expired, or has already been used.', 'unsupervised-schedular' );
 		}
 
 		// The submit nonce is verified by the caller (render) before this runs.
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
 		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- passwords must not be sanitized.
-		$password    = (string) wp_unslash( $_POST['password'] ?? '' );
-		$displayName = sanitize_text_field( wp_unslash( $_POST['display_name'] ?? '' ) );
+		$password    = Val::string( wp_unslash( $_POST['password'] ?? '' ) );
+		$displayName = sanitize_text_field( Val::string( wp_unslash( $_POST['display_name'] ?? '' ) ) );
 
 		if ( strlen( $password ) < 8 ) {
 			return esc_html__( 'Please choose a password of at least 8 characters.', 'unsupervised-schedular' );
 		}
 
+		// The email is fixed by a personal invite; group-link signups and
+		// self-signups supply their own.
+		if ( $inviteValid && ! $invite->isGroup() ) {
+			$email = $invite->email;
+		} else {
+			$email = sanitize_email( Val::string( wp_unslash( $_POST['email'] ?? '' ) ) );
+			if ( ! is_email( $email ) ) {
+				return esc_html__( 'Please enter a valid email address.', 'unsupervised-schedular' );
+			}
+		}
+
 		$policyForms = $this->signupPolicies();
-		$accepted    = array_map( 'absint', (array) ( $_POST['accept'] ?? [] ) );
+		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- each element is coerced to a positive int in the array_map callback; slashes cannot survive integer coercion.
+		$accepted = array_map( static fn( mixed $v ): int => absint( Val::int( $v ) ), (array) ( $_POST['accept'] ?? [] ) );
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
 
 		foreach ( $policyForms as $form ) {
@@ -106,17 +270,28 @@ class RegistrationPage {
 			}
 		}
 
-		if ( email_exists( $invite->email ) ) {
+		// Account-signup questions (step two) — validate before creating the user so
+		// a missing required answer never leaves a half-registered account behind.
+		$accountQuestions = $this->questions->findByScope( Question::SCOPE_ACCOUNT, activeOnly: true );
+		$answers          = $this->submittedAnswers();
+
+		foreach ( $accountQuestions as $question ) {
+			if ( $question->isRequired && '' === trim( (string) ( $answers[ (int) $question->id ] ?? '' ) ) ) {
+				return esc_html__( 'Please answer all required registration questions.', 'unsupervised-schedular' );
+			}
+		}
+
+		if ( email_exists( $email ) ) {
 			return esc_html__( 'An account already exists for this email.', 'unsupervised-schedular' );
 		}
 
 		$userId = wp_insert_user(
 			[
-				'user_login'   => $invite->email,
-				'user_email'   => $invite->email,
+				'user_login'   => $email,
+				'user_email'   => $email,
 				'user_pass'    => $password,
-				'display_name' => '' !== $displayName ? $displayName : $invite->email,
-				'role'         => $invite->role,
+				'display_name' => '' !== $displayName ? $displayName : $email,
+				'role'         => $inviteValid ? $invite->role : RoleManager::STUDENT,
 			]
 		);
 
@@ -125,12 +300,190 @@ class RegistrationPage {
 		}
 
 		$this->recordAcceptances( $policyForms, (int) $userId );
-		$this->invites->markAccepted( (int) $invite->id, (int) $userId );
+		$this->recordAnswers( $accountQuestions, $answers, (int) $userId );
 
-		wp_set_current_user( (int) $userId );
-		wp_set_auth_cookie( (int) $userId );
+		if ( $inviteValid && ! $invite->isGroup() ) {
+			$this->invites->markAccepted( (int) $invite->id, (int) $userId );
 
-		return true;
+			// A personal invite may carry a group-class grant (invited by email);
+			// point any grants for this address at the new account so the class
+			// becomes enrollable for them.
+			$this->access->linkStudentByEmail( $email, (int) $userId );
+
+			wp_set_current_user( (int) $userId );
+			wp_set_auth_cookie( (int) $userId );
+
+			return self::RESULT_INVITE;
+		}
+
+		// Group-link signups and self-signups both stay pending until they
+		// confirm their email; the group link is multi-use so it is never marked
+		// accepted. A group signup auto-approves on confirmation — no admin
+		// review — while a self-signup then waits for studio approval.
+		$autoApprove = $inviteValid && $invite->isGroup();
+
+		$rawToken = RegistrationStatus::markPending( (int) $userId, $autoApprove );
+		$user     = get_user_by( 'id', (int) $userId );
+		if ( $user instanceof \WP_User ) {
+			$this->mailer->sendConfirmation( $user, $this->confirmUrl( $rawToken ) );
+		}
+
+		return $autoApprove ? self::RESULT_CONFIRM_GROUP : self::RESULT_CONFIRM;
+	}
+
+	/**
+	 * The page id chosen for the post-registration destination, from either the
+	 * block (`loginPageId`) or shortcode (`login_page_id`) attribute.
+	 *
+	 * @param array<int|string, mixed> $atts
+	 */
+	private function successPageId( array $atts ): int {
+		return Val::int( $atts['loginPageId'] ?? $atts['login_page_id'] ?? 0 );
+	}
+
+	/**
+	 * URL the post-confirmation sign-in link points to: the chosen login page
+	 * when one is configured (and still exists), otherwise the WordPress login
+	 * screen.
+	 */
+	private function loginUrl( int $loginPageId ): string {
+		return $this->continueUrl( $loginPageId ) ?? wp_login_url();
+	}
+
+	/**
+	 * The "continue" paragraph shown to a logged-in visitor, or an empty string
+	 * when no destination page is configured. The link names the chosen page, so
+	 * the visitor knows where it goes before clicking; an untitled page falls
+	 * back to generic wording rather than reading "Continue to ".
+	 *
+	 * The sign-in-page fallback {@see loginUrl()} applies is deliberately not
+	 * used here: pointing someone who is already signed in at the login screen is
+	 * the same dead end with extra steps, so no link is better than that one.
+	 *
+	 * @param array<int|string, mixed> $atts
+	 */
+	private function continueLink( array $atts ): string {
+		$pageId   = $this->successPageId( $atts );
+		$continue = $this->continueUrl( $pageId );
+
+		if ( null === $continue ) {
+			return '';
+		}
+
+		$title = trim( Val::string( get_the_title( $pageId ) ) );
+		$label = '' === $title
+			? esc_html__( 'Continue to your account', 'unsupervised-schedular' )
+			: esc_html(
+				sprintf(
+					/* translators: %s: title of the page the student continues to. */
+					__( 'Continue to %s', 'unsupervised-schedular' ),
+					$title
+				)
+			);
+
+		return '<p><a href="' . esc_url( $continue ) . '">' . $label . '</a></p>';
+	}
+
+	/**
+	 * The chosen post-registration page's URL, or null when none is configured
+	 * (or it has since been deleted). Unlike {@see loginUrl()} this has no
+	 * WordPress-login-screen fallback, so callers that need a page the student
+	 * was actually sent to — the invited-student link and the block's
+	 * auto-redirect — can tell "not configured" from "configured".
+	 */
+	public function continueUrl( int $pageId ): ?string {
+		if ( $pageId <= 0 ) {
+			return null;
+		}
+
+		$url = get_permalink( $pageId );
+
+		return is_string( $url ) ? $url : null;
+	}
+
+	/**
+	 * Whether this request is a *finished* registration — the states the
+	 * block's auto-redirect may act on:
+	 *
+	 * - an invited student who just signed up and is now logged in, and
+	 * - a self-signup returning from the emailed confirmation link, whether
+	 *   their account is ready (`ready`) or awaiting studio approval (`1`).
+	 *
+	 * Deliberately excluded: the intermediate "check your email" step (the
+	 * student would never see the instruction) and every failure — a validation
+	 * error or an expired confirmation link (`expired`) — so the message always
+	 * gets shown. The `us_confirmed` values are set by
+	 * {@see EmailConfirmationHandler::maybeConfirm()}.
+	 */
+	public function isRegistrationComplete(): bool {
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only display flag; the submit that set it was nonce-checked.
+		$registered = sanitize_key( Val::string( wp_unslash( $_GET['us_registered'] ?? '' ) ) );
+
+		if ( self::RESULT_INVITE === $registered ) {
+			return is_user_logged_in();
+		}
+
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only display flag set by EmailConfirmationHandler's redirect.
+		$confirmed = sanitize_key( Val::string( wp_unslash( $_GET['us_confirmed'] ?? '' ) ) );
+
+		return in_array( $confirmed, [ '1', 'ready' ], true );
+	}
+
+	/**
+	 * Build the email-confirmation URL for a raw token: the configured
+	 * registration page (falling back to the home page) with `?us_confirm=`.
+	 */
+	private function confirmUrl( string $rawToken ): string {
+		$pageId = Val::int( get_option( RegistrationController::OPTION_PAGE, 0 ) );
+		$base   = $pageId > 0 ? (string) get_permalink( $pageId ) : home_url( '/' );
+
+		return add_query_arg( 'us_confirm', rawurlencode( $rawToken ), $base );
+	}
+
+	/**
+	 * The account-question answers submitted with the form, keyed by question id.
+	 *
+	 * @return array<int, string>
+	 */
+	private function submittedAnswers(): array {
+		// The submit nonce is verified by the caller (render) before this runs.
+		// phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash -- each value is unslashed and sanitized in the loop below.
+		$raw = $_POST['us_answers'] ?? [];
+		if ( ! is_array( $raw ) ) {
+			return [];
+		}
+
+		$out = [];
+		foreach ( $raw as $questionId => $value ) {
+			$out[ absint( Val::int( $questionId ) ) ] = sanitize_textarea_field( Val::string( wp_unslash( $value ) ) );
+		}
+
+		return $out;
+	}
+
+	/**
+	 * Persist the submitted answers for each active account-signup question.
+	 *
+	 * @param list<Question>     $questions
+	 * @param array<int, string> $answers   question_id => submitted value
+	 */
+	private function recordAnswers( array $questions, array $answers, int $userId ): void {
+		foreach ( $questions as $question ) {
+			$value = trim( (string) ( $answers[ (int) $question->id ] ?? '' ) );
+			if ( '' === $value ) {
+				continue;
+			}
+
+			$this->answers->insert(
+				new Answer(
+					questionId:       (int) $question->id,
+					registrationType: Answer::REG_ACCOUNT,
+					registrationId:   $userId,
+					studentId:        $userId,
+					answerValue:      $value,
+				)
+			);
+		}
 	}
 
 	/**
@@ -140,7 +493,7 @@ class RegistrationPage {
 	 */
 	private function recordAcceptances( array $policyForms, int $userId ): void {
 		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash -- IP is stored verbatim for audit.
-		$ip = sanitize_text_field( wp_unslash( $_SERVER['REMOTE_ADDR'] ?? '' ) );
+		$ip = sanitize_text_field( Val::string( wp_unslash( $_SERVER['REMOTE_ADDR'] ?? '' ) ) );
 
 		foreach ( $policyForms as $form ) {
 			$this->acceptances->insert(

src/Auth/RegistrationStatus.php

@@ -0,0 +1,156 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+use Unsupervised\Schedular\Val;
+
+/**
+ * The account lifecycle for a self-signup student, expressed entirely as user
+ * meta so it lives alongside the WordPress user and needs no extra table.
+ *
+ * States (see {@see docs/features/account-registration.md}):
+ * - Email unconfirmed — `us_awaiting_approval='1'`, no `us_email_confirmed`, a
+ *   hashed confirmation token + expiry set. Login is blocked.
+ * - Confirmed, awaiting approval — `us_awaiting_approval='1'`,
+ *   `us_email_confirmed='1'`, token/expiry cleared. Login allowed but the
+ *   booking capability is withheld.
+ * - Approved / active — `us_awaiting_approval` deleted; a normal student.
+ *
+ * Invite- and admin-created students carry none of these metas, so they behave
+ * exactly as before.
+ */
+class RegistrationStatus {
+
+	public const META_AWAITING_APPROVAL = 'us_awaiting_approval';
+	public const META_EMAIL_CONFIRMED   = 'us_email_confirmed';
+	public const META_CONFIRM_TOKEN     = 'us_email_confirm_token';
+	public const META_CONFIRM_EXPIRES   = 'us_email_confirm_expires';
+
+	/**
+	 * Set on accounts created via a group invite link: confirming the email
+	 * approves the account immediately instead of queueing it for admin review.
+	 */
+	public const META_AUTO_APPROVE = 'us_auto_approve';
+
+	/**
+	 * Hours a self-signup email-confirmation link stays valid after the account
+	 * is created. Limits the window in which a leaked link can be redeemed.
+	 */
+	public const EMAIL_CONFIRM_EXPIRY_HOURS = 48;
+
+	/**
+	 * Hash a raw confirmation token for storage and lookup. Only the hash is
+	 * persisted (mirrors {@see Invite::hashToken()}), so a database leak cannot
+	 * be used to confirm an account — the raw token exists only in the email.
+	 */
+	public static function hashToken( string $rawToken ): string {
+		return hash( 'sha256', $rawToken );
+	}
+
+	/**
+	 * Put a freshly created user into the pending state and issue an email
+	 * confirmation token. Returns the raw token to embed in the emailed link.
+	 * With `$autoApprove` (group invite links) confirming the email approves
+	 * the account immediately — no admin review step.
+	 */
+	public static function markPending( int $userId, bool $autoApprove = false ): string {
+		$rawToken = wp_generate_password( 32, false );
+
+		update_user_meta( $userId, self::META_AWAITING_APPROVAL, '1' );
+		update_user_meta( $userId, self::META_CONFIRM_TOKEN, self::hashToken( $rawToken ) );
+		update_user_meta(
+			$userId,
+			self::META_CONFIRM_EXPIRES,
+			gmdate( 'Y-m-d H:i:s', time() + self::EMAIL_CONFIRM_EXPIRY_HOURS * 3600 )
+		);
+
+		if ( $autoApprove ) {
+			update_user_meta( $userId, self::META_AUTO_APPROVE, '1' );
+		}
+
+		return $rawToken;
+	}
+
+	/**
+	 * Mark the account's email confirmed and discard the (now spent) token. The
+	 * account stays awaiting approval.
+	 */
+	public static function confirmEmail( int $userId ): void {
+		update_user_meta( $userId, self::META_EMAIL_CONFIRMED, '1' );
+		delete_user_meta( $userId, self::META_CONFIRM_TOKEN );
+		delete_user_meta( $userId, self::META_CONFIRM_EXPIRES );
+	}
+
+	/**
+	 * Approve the account: clear the pending flag and any leftover token so the
+	 * student becomes a normal, active student.
+	 */
+	public static function approve( int $userId ): void {
+		delete_user_meta( $userId, self::META_AWAITING_APPROVAL );
+		delete_user_meta( $userId, self::META_CONFIRM_TOKEN );
+		delete_user_meta( $userId, self::META_CONFIRM_EXPIRES );
+		delete_user_meta( $userId, self::META_AUTO_APPROVE );
+	}
+
+	public static function isAwaitingApproval( int $userId ): bool {
+		return '1' === Val::string( get_user_meta( $userId, self::META_AWAITING_APPROVAL, true ) );
+	}
+
+	/**
+	 * Whether confirming this account's email should approve it immediately
+	 * (group invite link signups).
+	 */
+	public static function isAutoApprove( int $userId ): bool {
+		return '1' === Val::string( get_user_meta( $userId, self::META_AUTO_APPROVE, true ) );
+	}
+
+	public static function emailConfirmed( int $userId ): bool {
+		return '1' === Val::string( get_user_meta( $userId, self::META_EMAIL_CONFIRMED, true ) );
+	}
+
+	/**
+	 * Find the user awaiting confirmation whose stored hash matches the supplied
+	 * raw token, or null when none matches.
+	 */
+	public static function userIdForToken( string $rawToken ): ?int {
+		if ( '' === $rawToken ) {
+			return null;
+		}
+
+		$users = get_users(
+			[
+				'meta_key'   => self::META_CONFIRM_TOKEN, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
+				'meta_value' => self::hashToken( $rawToken ), // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
+				'number'     => 1,
+				'fields'     => 'ID',
+			]
+		);
+
+		if ( [] === $users ) {
+			return null;
+		}
+
+		return Val::int( $users[0] );
+	}
+
+	/**
+	 * Whether the confirmation token for a user has passed its expiry, measured
+	 * against the supplied `Y-m-d H:i:s` (UTC) timestamp. A user with no stored
+	 * expiry is treated as expired (there is nothing valid to confirm).
+	 */
+	public static function isTokenExpired( int $userId, string $now ): bool {
+		$expires = Val::string( get_user_meta( $userId, self::META_CONFIRM_EXPIRES, true ) );
+		if ( '' === $expires ) {
+			return true;
+		}
+
+		$expiresTs = strtotime( $expires );
+		$nowTs     = strtotime( $now );
+		if ( false === $expiresTs || false === $nowTs ) {
+			return true;
+		}
+
+		return $nowTs > $expiresTs;
+	}
+}

src/Auth/StudentActions.php

@@ -0,0 +1,94 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+use Unsupervised\Schedular\Availability\AvailabilityRepository;
+use Unsupervised\Schedular\Booking\BookingRepository;
+use Unsupervised\Schedular\Booking\Lesson;
+use Unsupervised\Schedular\GroupClass\Enrollment;
+use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
+use Unsupervised\Schedular\Payment\PaymentService;
+
+/**
+ * Studio-admin actions on a single student from the student detail view:
+ * cancelling a lesson, withdrawing a group-class enrolment, and editing basic
+ * account details. Mutations go through the same paths as the student-facing
+ * flows so slot release and pending-payment voiding stay consistent.
+ */
+class StudentActions {
+
+	public function __construct(
+		private BookingRepository $bookings,
+		private AvailabilityRepository $availability,
+		private EnrollmentRepository $enrollments,
+		private PaymentService $payments,
+	) {}
+
+	/**
+	 * Cancel a lesson on the student's behalf: marks it cancelled, frees the
+	 * slot for rebooking, and voids a still-pending payment. A paid lesson is
+	 * credited back to the student's account (a per-lesson share of what they
+	 * paid) to offset their future scheduled billing.
+	 */
+	public function cancelLesson( int $lessonId, int $studentId ): bool {
+		$lesson = $this->bookings->findById( $lessonId );
+
+		if ( null === $lesson || $lesson->studentId !== $studentId || Lesson::STATUS_CANCELLED === $lesson->status ) {
+			return false;
+		}
+
+		$this->bookings->updateStatus( $lessonId, Lesson::STATUS_CANCELLED );
+		$this->availability->release( $lesson->slotId );
+		$this->payments->voidPending( $lesson->paymentId );
+		$this->payments->creditForCancelledLesson( $lesson );
+
+		return true;
+	}
+
+	/**
+	 * Withdraw the student from a group class: marks the active enrolment
+	 * cancelled (freeing its capacity seat) and voids a still-pending payment.
+	 */
+	public function withdrawEnrollment( int $enrollmentId, int $studentId ): bool {
+		$enrollment = $this->enrollments->findById( $enrollmentId );
+
+		if ( null === $enrollment || $enrollment->studentId !== $studentId || Enrollment::STATUS_ACTIVE !== $enrollment->status ) {
+			return false;
+		}
+
+		$this->enrollments->updateStatus( $enrollmentId, Enrollment::STATUS_CANCELLED );
+		$this->payments->voidPending( $enrollment->paymentId );
+
+		return true;
+	}
+
+	/**
+	 * Update the student's display name and email. The email must be valid and
+	 * not belong to another user.
+	 */
+	public function updateAccount( int $studentId, string $displayName, string $email ): bool|\WP_Error {
+		if ( '' === $displayName ) {
+			return new \WP_Error( 'empty_name', __( 'Display name cannot be empty.', 'unsupervised-schedular' ) );
+		}
+
+		if ( ! is_email( $email ) ) {
+			return new \WP_Error( 'invalid_email', __( 'Please enter a valid email address.', 'unsupervised-schedular' ) );
+		}
+
+		$existing = email_exists( $email );
+		if ( false !== $existing && (int) $existing !== $studentId ) {
+			return new \WP_Error( 'email_taken', __( 'Another account already uses this email address.', 'unsupervised-schedular' ) );
+		}
+
+		$result = wp_update_user(
+			[
+				'ID'           => $studentId,
+				'display_name' => $displayName,
+				'user_email'   => $email,
+			]
+		);
+
+		return $result instanceof \WP_Error ? $result : true;
+	}
+}

src/Auth/StudentAdminGuard.php

@@ -0,0 +1,103 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+/**
+ * Keeps front-end-only users (students) out of wp-admin entirely.
+ *
+ * Students authenticate through the front-end login shortcode and do all of
+ * their work — booking, viewing lessons, paying — on the site's public pages.
+ * They have no reason to see the WordPress dashboard, profile screen, or admin
+ * bar, so this guard redirects them to the front end if they reach wp-admin and
+ * hides the admin bar for them everywhere.
+ *
+ * Access is decided by capability, not role: anyone holding a back-office
+ * capability (a WordPress administrator, studio admin, or instructor) keeps full
+ * wp-admin access, while a user with none of them is treated as front-end only.
+ */
+class StudentAdminGuard {
+
+	/**
+	 * Capabilities that grant a genuine reason to be in wp-admin. A user holding
+	 * none of these is front-end only and is kept out of the dashboard.
+	 *
+	 * @var list<string>
+	 */
+	private const BACK_OFFICE_CAPS = [
+		'manage_options',
+		RoleManager::CAP_MANAGE_INSTRUCTORS,
+		RoleManager::CAP_MANAGE_STUDENTS,
+		RoleManager::CAP_MANAGE_OFFERINGS,
+		RoleManager::CAP_MANAGE_QUESTIONS,
+		RoleManager::CAP_MANAGE_POLICIES,
+		RoleManager::CAP_MANAGE_BILLING,
+		RoleManager::CAP_MANAGE_AVAILABILITY,
+		RoleManager::CAP_VIEW_ALL_LESSONS,
+		RoleManager::CAP_VIEW_ALL_PAYMENTS,
+		RoleManager::CAP_VIEW_OWN_PAYMENTS,
+		RoleManager::CAP_EXPORT_PAYMENTS,
+	];
+
+	public function register(): void {
+		add_action( 'admin_init', [ $this, 'redirectFromDashboard' ] );
+		add_filter( 'show_admin_bar', [ $this, 'hideAdminBar' ] );
+	}
+
+	/**
+	 * Redirect a front-end-only user away from any wp-admin page to the site
+	 * home, so the dashboard and profile screens are never reachable.
+	 */
+	public function redirectFromDashboard(): void {
+		if ( ! $this->shouldBlockAdminAccess() ) {
+			return;
+		}
+
+		wp_safe_redirect( home_url( '/' ) );
+		exit;
+	}
+
+	/**
+	 * Whether the current request into wp-admin should be bounced to the front
+	 * end. AJAX requests are always allowed through so front-end features that
+	 * call admin-ajax keep working.
+	 */
+	public function shouldBlockAdminAccess(): bool {
+		if ( wp_doing_ajax() ) {
+			return false;
+		}
+
+		if ( ! is_user_logged_in() ) {
+			return false;
+		}
+
+		return ! $this->hasBackOfficeAccess();
+	}
+
+	/**
+	 * Hide the admin bar for front-end-only users; leave it untouched for anyone
+	 * with back-office access.
+	 *
+	 * @param bool $show Whether WordPress would otherwise show the admin bar.
+	 */
+	public function hideAdminBar( bool $show ): bool {
+		if ( is_user_logged_in() && ! $this->hasBackOfficeAccess() ) {
+			return false;
+		}
+
+		return $show;
+	}
+
+	/**
+	 * Whether the current user holds any capability that warrants wp-admin access.
+	 */
+	private function hasBackOfficeAccess(): bool {
+		foreach ( self::BACK_OFFICE_CAPS as $cap ) {
+			if ( current_user_can( $cap ) ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+}

src/Auth/StudentController.php

@@ -11,6 +11,7 @@ use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
 use Unsupervised\Schedular\Offering\OfferingRepository;
 use Unsupervised\Schedular\Payment\BillingMethodResolver;
 use Unsupervised\Schedular\Payment\Payment;
+use Unsupervised\Schedular\Val;
 
 class StudentController {
 
@@ -20,6 +21,8 @@ class StudentController {
 		private OfferingRepository $offerings,
 		private EnrollmentRepository $enrollments,
 		private BillingMethodResolver $resolver,
+		private StudentHistory $history,
+		private StudentActions $actions,
 	) {}
 
 	public function renderPage(): void {
@@ -28,7 +31,7 @@ class StudentController {
 		}
 
 		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only student selector.
-		$studentId = absint( $_GET['student_id'] ?? 0 );
+		$studentId = absint( Val::int( $_GET['student_id'] ?? 0 ) );
 		$student   = $studentId > 0 ? get_userdata( $studentId ) : false;
 
 		if ( $student && in_array( RoleManager::STUDENT, (array) $student->roles, true ) ) {
@@ -45,12 +48,15 @@ class StudentController {
 				'upcoming'   => $this->bookings->countUpcomingForStudent( (int) $user->ID ),
 				'enrolments' => $this->enrollments->countActiveForStudent( (int) $user->ID ),
 			],
-			get_users(
-				[
-					'role'    => RoleManager::STUDENT,
-					'orderby' => 'display_name',
-					'order'   => 'ASC',
-				]
+			array_filter(
+				get_users(
+					[
+						'role'    => RoleManager::STUDENT,
+						'orderby' => 'display_name',
+						'order'   => 'ASC',
+					]
+				),
+				static fn( mixed $user ): bool => $user instanceof \WP_User
 			)
 		);
 
@@ -61,9 +67,15 @@ class StudentController {
 	private function renderDetail( \WP_User $student ): void {
 		$canBilling = current_user_can( RoleManager::CAP_MANAGE_BILLING );
 
-		if ( $canBilling && isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_student_billing' ) ) {
+		// phpcs:ignore WordPress.Security.NonceVerification.Missing -- routing only; each action below verifies its own nonce.
+		$action = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ?? '' ) ) );
+
+		$notice = '';
+		$error  = '';
+
+		if ( $canBilling && 'set_billing' === $action && check_admin_referer( 'usc_student_billing' ) ) {
 			// phpcs:ignore WordPress.Security.NonceVerification.Missing -- nonce checked above.
-			$method = sanitize_key( wp_unslash( $_POST['payment_method'] ?? '' ) );
+			$method = sanitize_key( Val::string( wp_unslash( $_POST['payment_method'] ?? '' ) ) );
 			if ( in_array( $method, Payment::VALID_METHODS, true ) ) {
 				update_user_meta( (int) $student->ID, BillingMethodResolver::META_METHOD, $method );
 			} else {
@@ -71,7 +83,43 @@ class StudentController {
 			}
 		}
 
-		$billingOverride = (string) get_user_meta( (int) $student->ID, BillingMethodResolver::META_METHOD, true );
+		if ( 'update_account' === $action && check_admin_referer( 'usc_student_actions' ) ) {
+			// phpcs:disable WordPress.Security.NonceVerification.Missing -- nonce checked above.
+			$displayName = sanitize_text_field( Val::string( wp_unslash( $_POST['display_name'] ?? '' ) ) );
+			$email       = sanitize_email( Val::string( wp_unslash( $_POST['user_email'] ?? '' ) ) );
+			// phpcs:enable WordPress.Security.NonceVerification.Missing
+
+			$result = $this->actions->updateAccount( (int) $student->ID, $displayName, $email );
+			if ( $result instanceof \WP_Error ) {
+				$error = $result->get_error_message();
+			} else {
+				$notice  = __( 'Account details updated.', 'unsupervised-schedular' );
+				$fresh   = get_userdata( (int) $student->ID );
+				$student = $fresh instanceof \WP_User ? $fresh : $student;
+			}
+		}
+
+		if ( 'cancel_lesson' === $action && check_admin_referer( 'usc_student_actions' ) ) {
+			// phpcs:ignore WordPress.Security.NonceVerification.Missing -- nonce checked above.
+			$lessonId = absint( Val::int( $_POST['lesson_id'] ?? 0 ) );
+			if ( $this->actions->cancelLesson( $lessonId, (int) $student->ID ) ) {
+				$notice = __( 'Lesson cancelled.', 'unsupervised-schedular' );
+			} else {
+				$error = __( 'This lesson could not be cancelled.', 'unsupervised-schedular' );
+			}
+		}
+
+		if ( 'withdraw_enrollment' === $action && check_admin_referer( 'usc_student_actions' ) ) {
+			// phpcs:ignore WordPress.Security.NonceVerification.Missing -- nonce checked above.
+			$enrollmentId = absint( Val::int( $_POST['enrollment_id'] ?? 0 ) );
+			if ( $this->actions->withdrawEnrollment( $enrollmentId, (int) $student->ID ) ) {
+				$notice = __( 'Enrolment withdrawn.', 'unsupervised-schedular' );
+			} else {
+				$error = __( 'This enrolment could not be withdrawn.', 'unsupervised-schedular' );
+			}
+		}
+
+		$billingOverride = Val::string( get_user_meta( (int) $student->ID, BillingMethodResolver::META_METHOD, true ) );
 		$billingDefault  = $this->resolver->defaultMethod();
 
 		$now  = current_time( 'mysql' );
@@ -89,6 +137,7 @@ class StudentController {
 				$offering = $this->offerings->findById( $enrollment->offeringId );
 
 				return [
+					'id'       => (int) $enrollment->id,
 					'offering' => $offering ? $offering->title : (string) $enrollment->offeringId,
 					'status'   => $enrollment->status,
 				];
@@ -96,10 +145,28 @@ class StudentController {
 			$this->enrollments->findByStudent( (int) $student->ID )
 		);
 
+		$acceptances      = $this->history->policyAcceptances( (int) $student->ID );
+		$registrationInfo = $this->history->registrationInfo( (int) $student->ID );
+		$intake           = $this->history->intakeAnswers( (int) $student->ID );
+		$payments         = $canBilling ? $this->history->payments( (int) $student->ID ) : [];
+		$credits          = $canBilling ? $this->history->credits( (int) $student->ID ) : [];
+		$creditBalance    = $canBilling ? $this->history->creditBalance( (int) $student->ID ) : 0.0;
+		$creditCurrency   = $this->creditCurrency( $credits );
+
 		$backUrl = admin_url( 'admin.php?page=us-students' );
 		include USC_PLUGIN_DIR . 'templates/admin/student-detail.php';
 	}
 
+	/**
+	 * Currency to label the credit balance with — taken from the student's credits
+	 * (they share a currency in practice), defaulting to CAD when they have none.
+	 *
+	 * @param list<array{created_at: string, amount: float, remaining: float, currency: string, reason: string, status: string}> $credits
+	 */
+	private function creditCurrency( array $credits ): string {
+		return [] !== $credits ? (string) $credits[0]['currency'] : 'CAD';
+	}
+
 	/**
 	 * Build a display row for a lesson (slot time, offering, instructor, status).
 	 *
@@ -111,6 +178,7 @@ class StudentController {
 		$instructor = get_userdata( $lesson->instructorId );
 
 		return [
+			'id'         => (int) $lesson->id,
 			'start_dt'   => $slot ? $slot->startDt : '',
 			'end_dt'     => $slot ? $slot->endDt : '',
 			'offering'   => $offering ? $offering->title : '—',

src/Auth/StudentHistory.php

@@ -0,0 +1,180 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+use Unsupervised\Schedular\Payment\Credit;
+use Unsupervised\Schedular\Payment\CreditRepository;
+use Unsupervised\Schedular\Payment\Payment;
+use Unsupervised\Schedular\Payment\PaymentRepository;
+use Unsupervised\Schedular\Policy\AcceptanceRepository;
+use Unsupervised\Schedular\Policy\PolicyAcceptance;
+use Unsupervised\Schedular\Policy\PolicyRepository;
+use Unsupervised\Schedular\Policy\PolicyVersionRepository;
+use Unsupervised\Schedular\Registration\Answer;
+use Unsupervised\Schedular\Registration\AnswerRepository;
+use Unsupervised\Schedular\Registration\Question;
+use Unsupervised\Schedular\Registration\QuestionRepository;
+
+/**
+ * Builds the display rows for the history sections of the admin student detail
+ * view: policy acceptances, intake answers, and payments.
+ */
+class StudentHistory {
+
+	public function __construct(
+		private AcceptanceRepository $acceptances,
+		private PolicyRepository $policies,
+		private PolicyVersionRepository $policyVersions,
+		private AnswerRepository $answers,
+		private QuestionRepository $questions,
+		private PaymentRepository $payments,
+		private CreditRepository $credits,
+	) {}
+
+	/**
+	 * Every policy acceptance the student has recorded, newest first.
+	 *
+	 * @return list<array{policy: string, version: string, context: string, accepted_at: string}>
+	 */
+	public function policyAcceptances( int $studentId ): array {
+		return array_map(
+			function ( PolicyAcceptance $acceptance ): array {
+				$version = $this->policyVersions->findById( $acceptance->policyVersionId );
+				$policy  = $version ? $this->policies->findById( $version->policyId ) : null;
+
+				return [
+					'policy'      => $policy ? $policy->title : sprintf( '#%d', $acceptance->policyVersionId ),
+					'version'     => $version ? sprintf( 'v%d', $version->versionNumber ) : '—',
+					'context'     => $this->contextLabel( $acceptance->registrationType, $acceptance->registrationId ),
+					'accepted_at' => $acceptance->acceptedAt ?? '',
+				];
+			},
+			$this->acceptances->findByStudent( $studentId )
+		);
+	}
+
+	/**
+	 * Booking/enrolment intake answers the student has submitted, newest first.
+	 * Account-signup answers are excluded — those are shown on their own under
+	 * {@see registrationInfo()}.
+	 *
+	 * @return list<array{question: string, answer: string, context: string}>
+	 */
+	public function intakeAnswers( int $studentId ): array {
+		$bookingAnswers = array_filter(
+			$this->answers->findByStudent( $studentId ),
+			static fn( Answer $answer ): bool => Answer::REG_ACCOUNT !== $answer->registrationType
+		);
+
+		return array_values(
+			array_map(
+				function ( Answer $answer ): array {
+					$question = $this->questions->findById( $answer->questionId );
+
+					return [
+						'question' => $question ? $question->label : sprintf( '#%d', $answer->questionId ),
+						'answer'   => $answer->answerValue ?? '—',
+						'context'  => $this->contextLabel( $answer->registrationType, $answer->registrationId ),
+					];
+				},
+				$bookingAnswers
+			)
+		);
+	}
+
+	/**
+	 * The student's answers to the studio-wide account-signup questions: every
+	 * configured account question paired with the student's answer ("—" when
+	 * unanswered, e.g. a question added after they registered).
+	 *
+	 * @return list<array{question: string, answer: string, required: bool}>
+	 */
+	public function registrationInfo( int $studentId ): array {
+		$byQuestion = [];
+		foreach ( $this->answers->findByRegistration( Answer::REG_ACCOUNT, $studentId ) as $answer ) {
+			$byQuestion[ $answer->questionId ] = $answer->answerValue ?? '';
+		}
+
+		return array_map(
+			static function ( Question $question ) use ( $byQuestion ): array {
+				$value = $byQuestion[ (int) $question->id ] ?? '';
+
+				return [
+					'question' => $question->label,
+					'answer'   => '' === $value ? '—' : $value,
+					'required' => $question->isRequired,
+				];
+			},
+			$this->questions->findByScope( Question::SCOPE_ACCOUNT )
+		);
+	}
+
+	/**
+	 * Every payment for the student, newest first.
+	 *
+	 * @return list<array{created_at: string, context: string, method: string, status: string, amount: float, tax_amount: float, total: float, currency: string, receipt: string}>
+	 */
+	public function payments( int $studentId ): array {
+		return array_map(
+			fn( Payment $payment ): array => [
+				'created_at' => $payment->createdAt ?? '',
+				'context'    => $this->contextLabel( $payment->registrationType, $payment->registrationId ),
+				'method'     => $payment->method,
+				'status'     => $payment->status,
+				'amount'     => $payment->amount,
+				'tax_amount' => $payment->taxAmount,
+				'total'      => $payment->total(),
+				'currency'   => $payment->currency,
+				'receipt'    => $payment->receiptNumber ?? '—',
+			],
+			$this->payments->findByStudent( $studentId )
+		);
+	}
+
+	/**
+	 * The student's total unused credit balance (from cancelled paid lessons),
+	 * applied automatically against future scheduled-billing charges.
+	 */
+	public function creditBalance( int $studentId ): float {
+		return $this->credits->availableBalance( $studentId );
+	}
+
+	/**
+	 * Every credit the student has been issued, newest first, with the amount, what
+	 * remains, and its state.
+	 *
+	 * @return list<array{created_at: string, amount: float, remaining: float, currency: string, reason: string, status: string}>
+	 */
+	public function credits( int $studentId ): array {
+		return array_map(
+			static fn( Credit $credit ): array => [
+				'created_at' => $credit->createdAt ?? '',
+				'amount'     => $credit->amount,
+				'remaining'  => $credit->remaining,
+				'currency'   => $credit->currency,
+				'reason'     => $credit->reason ?? '—',
+				'status'     => $credit->status,
+			],
+			$this->credits->findByStudent( $studentId )
+		);
+	}
+
+	/**
+	 * Human label for a polymorphic registration target.
+	 */
+	private function contextLabel( string $registrationType, int $registrationId ): string {
+		switch ( $registrationType ) {
+			case PolicyAcceptance::REG_ACCOUNT:
+				return __( 'Account signup', 'unsupervised-schedular' );
+			case PolicyAcceptance::REG_LESSON:
+				/* translators: %d: the lesson id */
+				return sprintf( __( 'Lesson #%d', 'unsupervised-schedular' ), $registrationId );
+			case PolicyAcceptance::REG_ENROLLMENT:
+				/* translators: %d: the group-class enrolment id */
+				return sprintf( __( 'Enrolment #%d', 'unsupervised-schedular' ), $registrationId );
+			default:
+				return sprintf( '%s #%d', $registrationType, $registrationId );
+		}
+	}
+}

src/Auth/StudentSchedule.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Auth;
 
+use Unsupervised\Schedular\Val;
+
 /**
  * Pure helper for splitting a student's dated rows into upcoming and past.
  */
@@ -21,7 +23,7 @@ class StudentSchedule {
 		$past     = [];
 
 		foreach ( $rows as $row ) {
-			$start = (string) ( $row['start_dt'] ?? '' );
+			$start = Val::string( $row['start_dt'] ?? '' );
 			if ( '' !== $start && $start >= $now ) {
 				$upcoming[] = $row;
 			} else {
@@ -29,12 +31,12 @@ class StudentSchedule {
 			}
 		}
 
-		usort( $upcoming, static fn( array $a, array $b ): int => strcmp( (string) ( $a['start_dt'] ?? '' ), (string) ( $b['start_dt'] ?? '' ) ) );
-		usort( $past, static fn( array $a, array $b ): int => strcmp( (string) ( $b['start_dt'] ?? '' ), (string) ( $a['start_dt'] ?? '' ) ) );
+		usort( $upcoming, static fn( array $a, array $b ): int => strcmp( Val::string( $a['start_dt'] ?? '' ), Val::string( $b['start_dt'] ?? '' ) ) );
+		usort( $past, static fn( array $a, array $b ): int => strcmp( Val::string( $b['start_dt'] ?? '' ), Val::string( $a['start_dt'] ?? '' ) ) );
 
 		return [
-			'upcoming' => array_values( $upcoming ),
-			'past'     => array_values( $past ),
+			'upcoming' => $upcoming,
+			'past'     => $past,
 		];
 	}
 }

src/Auth/UserName.php

@@ -0,0 +1,35 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Auth;
+
+/**
+ * Resolves a person's public-facing name for display. Prefers their real name
+ * (first + last), then their nickname — deliberately avoiding the account's
+ * login/username, which `display_name` can otherwise expose.
+ */
+class UserName {
+
+	/**
+	 * The display name for a user: "First Last" when a real name is set,
+	 * otherwise the WordPress nickname. Falls back to the numeric id (or an empty
+	 * string when none is given) when the user cannot be loaded or has no name.
+	 */
+	public static function format( ?\WP_User $user, int $fallbackId = 0 ): string {
+		if ( ! $user instanceof \WP_User ) {
+			return $fallbackId > 0 ? (string) $fallbackId : '';
+		}
+
+		$full = trim( $user->first_name . ' ' . $user->last_name );
+		if ( '' !== $full ) {
+			return $full;
+		}
+
+		$nickname = trim( $user->nickname );
+		if ( '' !== $nickname ) {
+			return $nickname;
+		}
+
+		return $fallbackId > 0 ? (string) $fallbackId : '';
+	}
+}

src/Availability/AvailabilityController.php

@@ -6,12 +6,14 @@ namespace Unsupervised\Schedular\Availability;
 use Unsupervised\Schedular\Auth\RoleManager;
 use Unsupervised\Schedular\Offering\Offering;
 use Unsupervised\Schedular\Offering\OfferingRepository;
+use Unsupervised\Schedular\Val;
 
 class AvailabilityController {
 
 	public function __construct(
 		private AvailabilityRepository $repository,
 		private OfferingRepository $offerings,
+		private WindowValidator $validator,
 	) {}
 
 	public function renderPage(): void {
@@ -20,64 +22,169 @@ class AvailabilityController {
 		}
 
 		$instructorId = get_current_user_id();
+		$notice       = '';
+		$error        = '';
 
 		if ( isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_availability_action' ) ) {
-			$this->handleFormAction( $instructorId );
+			[ $notice, $error ] = $this->handleFormAction( $instructorId );
 		}
 
 		$slots           = $this->repository->findByInstructor( $instructorId );
 		$offeringChoices = $this->offerings->findAll( $instructorId, Offering::KIND_PRIVATE_LESSON, true );
 
+		// View-state query params only (which view, which week) — nothing is
+		// mutated from them, so no nonce applies.
+		// phpcs:disable WordPress.Security.NonceVerification.Recommended
+		$view          = 'list' === sanitize_key( Val::string( wp_unslash( $_GET['usc_view'] ?? '' ) ) ) ? 'list' : 'week';
+		$requestedWeek = sanitize_text_field( Val::string( wp_unslash( $_GET['usc_week'] ?? '' ) ) );
+		// phpcs:enable WordPress.Security.NonceVerification.Recommended
+
+		$weekStart = WeekCalendar::weekStart( $requestedWeek, Val::int( get_option( 'start_of_week', 1 ) ), current_time( 'Y-m-d' ) );
+		$weekDays  = WeekCalendar::days( $weekStart, $slots );
+		$prevWeek  = ( new \DateTimeImmutable( $weekStart ) )->modify( '-7 days' )->format( 'Y-m-d' );
+		$nextWeek  = ( new \DateTimeImmutable( $weekStart ) )->modify( '+7 days' )->format( 'Y-m-d' );
+
 		include USC_PLUGIN_DIR . 'templates/admin/availability.php';
 	}
 
-	private function handleFormAction( int $instructorId ): void {
+	/**
+	 * Run the submitted action and report what happened. Every branch returns a
+	 * message: a form that silently reloads leaves the instructor unable to tell
+	 * "saved 41 slots" from "saved nothing".
+	 *
+	 * @return array{string, string} Success notice and error message; each is
+	 *                               empty when it does not apply.
+	 */
+	private function handleFormAction( int $instructorId ): array {
 		// Nonce is verified by the caller (renderPage) before this method runs.
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$action = sanitize_key( wp_unslash( $_POST['usc_action'] ?? '' ) );
+		$action = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ?? '' ) ) );
 
 		if ( 'add' === $action ) {
-			$this->addSlot( $instructorId );
+			return $this->addSlot( $instructorId );
 		}
 
 		if ( 'delete' === $action ) {
-			$slotId = absint( $_POST['slot_id'] ?? 0 );
-			if ( $slotId > 0 ) {
-				$slot = $this->repository->findById( $slotId );
-				if ( $slot && $slot->instructorId === $instructorId ) {
-					$this->repository->delete( $slotId );
+			return $this->deleteOwnSlot( absint( Val::int( $_POST['slot_id'] ?? 0 ) ), $instructorId )
+				? [ __( 'Availability slot deleted.', 'unsupervised-schedular' ), '' ]
+				: [ '', __( 'That slot could not be deleted. It may already be booked, or belong to someone else.', 'unsupervised-schedular' ) ];
+		}
+
+		if ( 'bulk_delete' === $action ) {
+			// The array itself carries no data; each element is coerced and
+			// absint-sanitized individually below.
+			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput
+			$rawIds  = $_POST['slot_ids'] ?? [];
+			$deleted = 0;
+			$failed  = 0;
+
+			foreach ( is_array( $rawIds ) ? $rawIds : [] as $rawId ) {
+				if ( $this->deleteOwnSlot( absint( Val::int( $rawId ) ), $instructorId ) ) {
+					++$deleted;
+					continue;
 				}
+
+				++$failed;
 			}
+
+			return $this->bulkDeleteResult( $deleted, $failed );
 		}
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
+
+		return [ '', '' ];
 	}
 
-	private function addSlot( int $instructorId ): void {
-		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$startDt = sanitize_text_field( wp_unslash( $_POST['start_dt'] ?? '' ) );
-		$endDt   = sanitize_text_field( wp_unslash( $_POST['end_dt'] ?? '' ) );
+	/**
+	 * Wording for a bulk delete, which can partly succeed.
+	 *
+	 * @return array{string, string}
+	 */
+	private function bulkDeleteResult( int $deleted, int $failed ): array {
+		$notice = $deleted > 0
+			? sprintf(
+				/* translators: %d: number of availability slots deleted. */
+				_n( '%d slot deleted.', '%d slots deleted.', $deleted, 'unsupervised-schedular' ),
+				$deleted
+			)
+			: '';
 
-		if ( '' === $startDt || '' === $endDt ) {
-			return;
+		$error = $failed > 0
+			? sprintf(
+				/* translators: %d: number of slots that could not be deleted. */
+				_n(
+					'%d slot could not be deleted — it may already be booked.',
+					'%d slots could not be deleted — they may already be booked.',
+					$failed,
+					'unsupervised-schedular'
+				),
+				$failed
+			)
+			: '';
+
+		if ( 0 === $deleted && 0 === $failed ) {
+			$error = __( 'No slots were selected.', 'unsupervised-schedular' );
 		}
 
-		$offeringId = absint( $_POST['offering_id'] ?? 0 );
-		$duration   = absint( $_POST['duration_minutes'] ?? 0 );
+		return [ $notice, $error ];
+	}
 
-		$slot = new AvailabilitySlot(
-			instructorId:    $instructorId,
-			startDt:         $startDt,
-			endDt:           $endDt,
-			durationMinutes: $duration > 0 ? $duration : 60,
-			offeringId:      $offeringId > 0 ? $offeringId : null,
+	/**
+	 * Delete a slot only when it exists and belongs to the given instructor.
+	 * The repository additionally refuses to delete booked slots. Returns whether
+	 * the row actually went away.
+	 */
+	private function deleteOwnSlot( int $slotId, int $instructorId ): bool {
+		if ( $slotId <= 0 ) {
+			return false;
+		}
+
+		$slot = $this->repository->findById( $slotId );
+
+		if ( null === $slot || $slot->instructorId !== $instructorId ) {
+			return false;
+		}
+
+		return $this->repository->delete( $slotId );
+	}
+
+	/**
+	 * Validate and persist a submitted window.
+	 *
+	 * @return array{string, string}
+	 */
+	private function addSlot( int $instructorId ): array {
+		// phpcs:disable WordPress.Security.NonceVerification.Missing
+		$window = $this->validator->validate(
+			$instructorId,
+			sanitize_text_field( Val::string( wp_unslash( $_POST['start_dt'] ?? '' ) ) ),
+			sanitize_text_field( Val::string( wp_unslash( $_POST['end_dt'] ?? '' ) ) ),
+			absint( Val::int( $_POST['duration_minutes'] ?? 0 ) ),
+			absint( Val::int( $_POST['offering_id'] ?? 0 ) ),
 		);
 
-		if ( 'weekly' === sanitize_key( wp_unslash( $_POST['recurrence'] ?? 'single' ) ) ) {
-			$this->repository->createWeeklySeries( $slot, absint( $_POST['weeks'] ?? 1 ) );
-			return;
+		if ( $window instanceof \WP_Error ) {
+			return [ '', $window->get_error_message() ];
 		}
 
-		$this->repository->insert( $slot );
+		$recurrence = sanitize_key( Val::string( wp_unslash( $_POST['recurrence'] ?? 'single' ) ) );
+		$weeks      = absint( Val::int( $_POST['weeks'] ?? 1 ) );
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
+
+		$ids = $this->repository->createFromWindow( $window, 'weekly' === $recurrence, $weeks );
+
+		// The window was valid, so it split into at least one slot — an empty
+		// result means every insert failed.
+		if ( [] === $ids ) {
+			return [ '', __( 'The availability could not be saved. Please try again.', 'unsupervised-schedular' ) ];
+		}
+
+		return [
+			sprintf(
+				/* translators: %d: number of bookable slots created. */
+				_n( 'Added %d bookable slot.', 'Added %d bookable slots.', count( $ids ), 'unsupervised-schedular' ),
+				count( $ids )
+			),
+			'',
+		];
 	}
 }

src/Availability/AvailabilityEndpoint.php

@@ -4,15 +4,20 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Availability;
 
 use Unsupervised\Schedular\Auth\RoleManager;
-use Unsupervised\Schedular\Offering\OfferingRepository;
+use Unsupervised\Schedular\Val;
 
 class AvailabilityEndpoint {
 
 	public function __construct(
 		private AvailabilityRepository $repository,
-		private OfferingRepository $offerings,
+		private WindowValidator $validator,
 	) {}
 
+	/**
+	 * Registers this endpoint's REST routes.
+	 *
+	 * @param non-falsy-string $route_namespace REST namespace the routes are registered under (e.g. `us-scheduler/v1`).
+	 */
 	public function registerRoutes( string $route_namespace ): void {
 		register_rest_route(
 			$route_namespace,
@@ -96,51 +101,48 @@ class AvailabilityEndpoint {
 
 	public function index( \WP_REST_Request $request ): \WP_REST_Response {
 		$slots = $this->repository->findAvailable(
-			(int) $request->get_param( 'instructor_id' ),
-			(int) $request->get_param( 'offering_id' ),
-			(int) $request->get_param( 'duration_minutes' ),
-			(string) $request->get_param( 'from' ),
-			(string) $request->get_param( 'to' ),
+			Val::int( $request->get_param( 'instructor_id' ) ),
+			Val::int( $request->get_param( 'offering_id' ) ),
+			Val::int( $request->get_param( 'duration_minutes' ) ),
+			Val::string( $request->get_param( 'from' ) ),
+			Val::string( $request->get_param( 'to' ) ),
 		);
 
 		return new \WP_REST_Response( array_map( fn( AvailabilitySlot $s ) => $s->toArray(), $slots ), 200 );
 	}
 
 	public function create( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$instructorId = get_current_user_id();
-		$offeringId   = absint( $request->get_param( 'offering_id' ) );
-		$duration     = absint( $request->get_param( 'duration_minutes' ) );
-
-		// A slot may only be tied to an offering the instructor owns, so it can
-		// never inherit another instructor's price or payment routing at booking.
-		if ( $offeringId > 0 ) {
-			$offering = $this->offerings->findById( $offeringId );
-			if ( null === $offering || $offering->instructorId !== $instructorId ) {
-				return new \WP_Error( 'invalid_offering', __( 'That offering is not available.', 'unsupervised-schedular' ), [ 'status' => 400 ] );
-			}
-		}
-
-		$slot = new AvailabilitySlot(
-			instructorId:    $instructorId,
-			startDt:         (string) $request->get_param( 'start_dt' ),
-			endDt:           (string) $request->get_param( 'end_dt' ),
-			durationMinutes: $duration > 0 ? $duration : 60,
-			offeringId:      $offeringId > 0 ? $offeringId : null,
+		// Validation lives in WindowValidator so this endpoint and the admin form
+		// enforce exactly the same rules.
+		$window = $this->validator->validate(
+			get_current_user_id(),
+			Val::string( $request->get_param( 'start_dt' ) ),
+			Val::string( $request->get_param( 'end_dt' ) ),
+			absint( Val::int( $request->get_param( 'duration_minutes' ) ) ),
+			absint( Val::int( $request->get_param( 'offering_id' ) ) ),
 		);
 
-		if ( 'weekly' === $request->get_param( 'recurrence' ) ) {
-			$ids = $this->repository->createWeeklySeries( $slot, absint( $request->get_param( 'weeks' ) ) );
-
-			return new \WP_REST_Response( [ 'ids' => $ids ], 201 );
+		if ( $window instanceof \WP_Error ) {
+			return $window;
 		}
 
-		$id = $this->repository->insert( $slot );
+		$ids = $this->repository->createFromWindow(
+			$window,
+			'weekly' === $request->get_param( 'recurrence' ),
+			absint( Val::int( $request->get_param( 'weeks' ) ) )
+		);
 
-		return new \WP_REST_Response( [ 'id' => $id ], 201 );
+		// A valid window splits into at least one slot, so nothing written means
+		// every insert failed.
+		if ( [] === $ids ) {
+			return new \WP_Error( 'not_saved', __( 'The availability could not be saved.', 'unsupervised-schedular' ), [ 'status' => 500 ] );
+		}
+
+		return new \WP_REST_Response( [ 'ids' => $ids ], 201 );
 	}
 
 	public function delete( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$id   = absint( $request->get_param( 'id' ) );
+		$id   = absint( Val::int( $request->get_param( 'id' ) ) );
 		$slot = $this->repository->findById( $id );
 
 		if ( null === $slot ) {

src/Availability/AvailabilityRepository.php

@@ -11,8 +11,14 @@ class AvailabilityRepository {
 		$this->table = $db->prefix . 'us_availability';
 	}
 
+	/**
+	 * Insert one slot row. Returns its id, or 0 when the write failed —
+	 * `insert_id` still holds the *previous* statement's id after a failed
+	 * insert, so returning it unconditionally made a failed write look like a
+	 * successful one.
+	 */
 	public function insert( AvailabilitySlot $slot ): int {
-		$this->db->insert(
+		$written = $this->db->insert(
 			$this->table,
 			[
 				'instructor_id'    => $slot->instructorId,
@@ -27,7 +33,35 @@ class AvailabilityRepository {
 			[ '%d', '%d', '%s', '%s', '%d', '%d', '%d', '%s' ]
 		);
 
-		return $this->db->insert_id;
+		return false === $written ? 0 : $this->db->insert_id;
+	}
+
+	/**
+	 * Persist an availability window as individually bookable lesson-length slots.
+	 * The window is split into consecutive `duration_minutes` chunks; each chunk
+	 * becomes its own row (and, when weekly, its own weekly series) so students can
+	 * book any open lesson-length block within the window.
+	 *
+	 * @return list<int> Inserted slot IDs.
+	 */
+	public function createFromWindow( AvailabilitySlot $window, bool $weekly = false, int $weeks = 1 ): array {
+		$ids = [];
+
+		foreach ( $window->splitByDuration() as $slot ) {
+			if ( $weekly ) {
+				$ids = array_merge( $ids, $this->createWeeklySeries( $slot, $weeks ) );
+				continue;
+			}
+
+			$id = $this->insert( $slot );
+
+			// A failed insert returns 0; it must not reach the caller as an id.
+			if ( $id > 0 ) {
+				$ids[] = $id;
+			}
+		}
+
+		return $ids;
 	}
 
 	/**
@@ -35,10 +69,14 @@ class AvailabilityRepository {
 	 * separate row one week apart, all sharing a `recurrence_group` (the id of the
 	 * first row).
 	 *
+	 * The count is clamped to `AvailabilitySlot::MAX_WEEKLY_OCCURRENCES`. The
+	 * form's `max` attribute says the same, but only this is binding — a
+	 * hand-crafted POST used to be able to ask for an unbounded number of rows.
+	 *
 	 * @return list<int> Inserted slot IDs.
 	 */
 	public function createWeeklySeries( AvailabilitySlot $first, int $occurrences ): array {
-		$occurrences = max( 1, $occurrences );
+		$occurrences = max( 1, min( AvailabilitySlot::MAX_WEEKLY_OCCURRENCES, $occurrences ) );
 		$start       = new \DateTimeImmutable( $first->startDt );
 		$end         = new \DateTimeImmutable( $first->endDt );
 
@@ -59,6 +97,13 @@ class AvailabilityRepository {
 				)
 			);
 
+			// A failed insert returns 0. Skipping it keeps a bogus id out of the
+			// returned list and, more importantly, stops 0 becoming the series'
+			// recurrence group — which would orphan every later occurrence.
+			if ( $id <= 0 ) {
+				continue;
+			}
+
 			if ( 0 === $groupId ) {
 				$groupId = $id;
 				$this->setRecurrenceGroup( $id, $groupId );
@@ -87,8 +132,10 @@ class AvailabilityRepository {
 	 * @return list<AvailabilitySlot>
 	 */
 	public function findAvailable( int $instructorId = 0, int $offeringId = 0, int $durationMinutes = 0, string $from = '', string $to = '' ): array {
-		$where  = [ 'is_booked = 0' ];
-		$params = [];
+		// A slot whose start has passed can no longer be booked, so it is never
+		// "available" regardless of the requested range.
+		$where  = [ 'is_booked = 0', 'start_dt >= %s' ];
+		$params = [ current_time( 'mysql' ) ];
 
 		if ( $instructorId > 0 ) {
 			$where[]  = 'instructor_id = %d';
@@ -116,11 +163,11 @@ class AvailabilityRepository {
 		}
 
 		$whereClause = implode( ' AND ', $where );
-		$sql         = "SELECT * FROM {$this->table} WHERE {$whereClause} ORDER BY start_dt ASC";
+		$sql         = "SELECT * FROM %i WHERE {$whereClause} ORDER BY start_dt ASC";
 
-		$rows = $params
-			? $this->db->get_results( $this->db->prepare( $sql, $params ) )
-			: $this->db->get_results( $sql );
+		$rows = $this->db->get_results(
+			$this->db->prepare( $sql, array_merge( [ $this->table ], $params ) )
+		);
 
 		return array_map( AvailabilitySlot::fromRow( ... ), $rows ?? [] );
 	}
@@ -133,7 +180,8 @@ class AvailabilityRepository {
 	public function findByInstructor( int $instructorId ): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE instructor_id = %d ORDER BY start_dt ASC",
+				'SELECT * FROM %i WHERE instructor_id = %d ORDER BY start_dt ASC',
+				$this->table,
 				$instructorId
 			)
 		);
@@ -149,7 +197,8 @@ class AvailabilityRepository {
 	public function findUnbookedInGroup( int $recurrenceGroup ): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE recurrence_group = %d AND is_booked = 0 ORDER BY start_dt ASC",
+				'SELECT * FROM %i WHERE recurrence_group = %d AND is_booked = 0 ORDER BY start_dt ASC',
+				$this->table,
 				$recurrenceGroup
 			)
 		);
@@ -157,9 +206,31 @@ class AvailabilityRepository {
 		return array_map( AvailabilitySlot::fromRow( ... ), $rows ?? [] );
 	}
 
+	/**
+	 * An instructor's slots (booked and unbooked) that overlap a time window —
+	 * they share any time with the half-open interval [$start, $end). Used when a
+	 * group class is scheduled to find the private-booking slots that collide with
+	 * it, so open ones can be cleared and booked ones flagged as conflicts.
+	 *
+	 * @return list<AvailabilitySlot>
+	 */
+	public function findOverlapping( int $instructorId, string $start, string $end ): array {
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT * FROM %i WHERE instructor_id = %d AND start_dt < %s AND end_dt > %s ORDER BY start_dt ASC',
+				$this->table,
+				$instructorId,
+				$end,
+				$start
+			)
+		);
+
+		return array_map( AvailabilitySlot::fromRow( ... ), $rows ?? [] );
+	}
+
 	public function findById( int $id ): ?AvailabilitySlot {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE id = %d", $id )
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
 		);
 
 		return $row ? AvailabilitySlot::fromRow( $row ) : null;
@@ -187,6 +258,60 @@ class AvailabilityRepository {
 		return 1 === $updated;
 	}
 
+	/**
+	 * Free a slot whose lesson was cancelled so the time can be booked again.
+	 */
+	public function release( int $id ): bool {
+		return false !== $this->db->update(
+			$this->table,
+			[ 'is_booked' => 0 ],
+			[ 'id' => $id ],
+			[ '%d' ],
+			[ '%d' ]
+		);
+	}
+
+	/**
+	 * One-time upgrade for rows created before windows were split on save: a
+	 * window stored as a single row (e.g. 09:00–16:00 with 60-minute lessons)
+	 * showed to students as one giant slot. Rewrites every unbooked same-day
+	 * window longer than its lesson length as lesson-length rows: the original
+	 * row is trimmed to the first chunk (keeping its id and any recurrence
+	 * group), and the remaining chunks are inserted as one-off rows.
+	 */
+	public function splitOversizedWindows(): void {
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT * FROM %i
+                 WHERE is_booked = 0
+                   AND DATE(start_dt) = DATE(end_dt)
+                   AND TIMESTAMPDIFF(MINUTE, start_dt, end_dt) > duration_minutes',
+				$this->table
+			)
+		);
+
+		foreach ( $rows ?? [] as $row ) {
+			$window = AvailabilitySlot::fromRow( $row );
+			$chunks = $window->splitByDuration();
+
+			if ( [] === $chunks ) {
+				continue;
+			}
+
+			$this->db->update(
+				$this->table,
+				[ 'end_dt' => $chunks[0]->endDt ],
+				[ 'id' => $window->id ],
+				[ '%s' ],
+				[ '%d' ]
+			);
+
+			foreach ( array_slice( $chunks, 1 ) as $chunk ) {
+				$this->insert( $chunk );
+			}
+		}
+	}
+
 	/**
 	 * Delete an unbooked slot. Returns false if the slot is already booked.
 	 */

src/Availability/AvailabilitySlot.php

@@ -3,8 +3,27 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Availability;
 
+use Unsupervised\Schedular\Val;
+
 class AvailabilitySlot {
 
+	/** Lesson length used when none was submitted. */
+	public const DEFAULT_DURATION_MINUTES = 60;
+
+	/**
+	 * Lesson lengths a window can be split into, offered by the availability
+	 * form. The form hides the ones a given window is too short for.
+	 *
+	 * @var list<int>
+	 */
+	public const DURATION_CHOICES = [ 30, 60 ];
+
+	/**
+	 * Ceiling on a weekly series, matching the form's `max`. Enforced in the
+	 * repository too, so a hand-crafted POST cannot ask for ten thousand rows.
+	 */
+	public const MAX_WEEKLY_OCCURRENCES = 52;
+
 	public function __construct(
 		public readonly int $instructorId,
 		public readonly string $startDt,
@@ -16,16 +35,71 @@ class AvailabilitySlot {
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	/**
+	 * Normalise a submitted slot datetime to canonical `Y-m-d H:i:s`, or null when
+	 * it is not a real datetime. Accepts the HTML `datetime-local` form
+	 * (`Y-m-d\TH:i`, optionally with seconds) and the canonical form (optionally
+	 * without seconds). Anything else — including strings PHP would "helpfully"
+	 * coerce — is rejected so garbage never reaches the DATETIME column or throws
+	 * inside the weekly-series date arithmetic.
+	 */
+	public static function normalizeDateTime( string $value ): ?string {
+		foreach ( [ 'Y-m-d H:i:s', 'Y-m-d H:i', 'Y-m-d\TH:i:s', 'Y-m-d\TH:i' ] as $format ) {
+			$dt = \DateTimeImmutable::createFromFormat( '!' . $format, $value );
+			if ( false !== $dt && $dt->format( $format ) === $value ) {
+				return $dt->format( 'Y-m-d H:i:s' );
+			}
+		}
+
+		return null;
+	}
+
+	/**
+	 * Split this window into consecutive lesson-length slots: 09:00–16:00 with
+	 * 60-minute lessons yields seven bookable slots. A trailing remainder shorter
+	 * than the lesson length is dropped, and an empty list is returned when the
+	 * window cannot fit a single lesson.
+	 *
+	 * @return list<self>
+	 */
+	public function splitByDuration(): array {
+		if ( $this->durationMinutes <= 0 ) {
+			return [];
+		}
+
+		$end  = new \DateTimeImmutable( $this->endDt );
+		$step = new \DateInterval( 'PT' . $this->durationMinutes . 'M' );
+
+		$cursor   = new \DateTimeImmutable( $this->startDt );
+		$chunkEnd = $cursor->add( $step );
+
+		$slots = [];
+		while ( $chunkEnd <= $end ) {
+			$slots[] = new self(
+				instructorId:    $this->instructorId,
+				startDt:         $cursor->format( 'Y-m-d H:i:s' ),
+				endDt:           $chunkEnd->format( 'Y-m-d H:i:s' ),
+				durationMinutes: $this->durationMinutes,
+				offeringId:      $this->offeringId,
+			);
+
+			$cursor   = $chunkEnd;
+			$chunkEnd = $cursor->add( $step );
+		}
+
+		return $slots;
+	}
+
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			instructorId:    (int) $row->instructor_id,
-			startDt:         $row->start_dt,
-			endDt:           $row->end_dt,
-			durationMinutes: (int) $row->duration_minutes,
-			offeringId:      null !== $row->offering_id ? (int) $row->offering_id : null,
-			isBooked:        (bool) $row->is_booked,
-			recurrenceGroup: null !== $row->recurrence_group ? (int) $row->recurrence_group : null,
-			id:              (int) $row->id,
+			instructorId:    Val::int( $row->instructor_id ),
+			startDt:         Val::string( $row->start_dt ),
+			endDt:           Val::string( $row->end_dt ),
+			durationMinutes: Val::int( $row->duration_minutes ),
+			offeringId:      Val::intOrNull( $row->offering_id ),
+			isBooked:        Val::bool( $row->is_booked ),
+			recurrenceGroup: Val::intOrNull( $row->recurrence_group ),
+			id:              Val::int( $row->id ),
 		);
 	}
 

src/Availability/WeekCalendar.php

@@ -0,0 +1,87 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Availability;
+
+/**
+ * Pure helpers for the weekly calendar views: resolving which week to show and
+ * bucketing slots into that week's seven days.
+ */
+class WeekCalendar {
+
+	/**
+	 * Resolve a requested week anchor to the date of the first day of its week.
+	 * `$requested` may be any date (`Y-m-d`) inside the wanted week; anything
+	 * unparseable falls back to `$today`. `$startOfWeek` follows WordPress's
+	 * `start_of_week` option (0 = Sunday … 6 = Saturday).
+	 */
+	public static function weekStart( string $requested, int $startOfWeek, string $today ): string {
+		$anchor = self::parseDay( $requested ) ?? self::parseDay( $today ) ?? new \DateTimeImmutable( 'today' );
+		$shift  = ( (int) $anchor->format( 'w' ) - $startOfWeek + 7 ) % 7;
+
+		return $anchor->modify( '-' . $shift . ' days' )->format( 'Y-m-d' );
+	}
+
+	/**
+	 * Bucket slots into the seven days of the week starting at `$weekStart`
+	 * (`Y-m-d`). Every day is present, empty or not, in calendar order.
+	 *
+	 * @param list<AvailabilitySlot> $slots
+	 * @return list<array{date: string, slots: list<AvailabilitySlot>}>
+	 */
+	public static function days( string $weekStart, array $slots ): array {
+		$start = self::parseDay( $weekStart ) ?? new \DateTimeImmutable( 'today' );
+
+		$byDay = [];
+		foreach ( $slots as $slot ) {
+			$byDay[ substr( $slot->startDt, 0, 10 ) ][] = $slot;
+		}
+
+		$days = [];
+		for ( $i = 0; $i < 7; $i++ ) {
+			$date   = $start->modify( '+' . $i . ' days' )->format( 'Y-m-d' );
+			$days[] = [
+				'date'  => $date,
+				'slots' => $byDay[ $date ] ?? [],
+			];
+		}
+
+		return $days;
+	}
+
+	/**
+	 * Bucket arbitrary items into the seven days of the week starting at
+	 * `$weekStart` (`Y-m-d`), using `$dayOf` to extract each item's `Y-m-d` day.
+	 * Every day is present, empty or not, in calendar order.
+	 *
+	 * @template T
+	 * @param list<T> $items
+	 * @param callable(T): string $dayOf
+	 * @return list<array{date: string, items: list<T>}>
+	 */
+	public static function bucket( string $weekStart, array $items, callable $dayOf ): array {
+		$start = self::parseDay( $weekStart ) ?? new \DateTimeImmutable( 'today' );
+
+		$byDay = [];
+		foreach ( $items as $item ) {
+			$byDay[ $dayOf( $item ) ][] = $item;
+		}
+
+		$days = [];
+		for ( $i = 0; $i < 7; $i++ ) {
+			$date   = $start->modify( '+' . $i . ' days' )->format( 'Y-m-d' );
+			$days[] = [
+				'date'  => $date,
+				'items' => $byDay[ $date ] ?? [],
+			];
+		}
+
+		return $days;
+	}
+
+	private static function parseDay( string $value ): ?\DateTimeImmutable {
+		$day = \DateTimeImmutable::createFromFormat( '!Y-m-d', $value );
+
+		return false !== $day && $day->format( 'Y-m-d' ) === $value ? $day : null;
+	}
+}

src/Availability/WindowValidator.php

@@ -0,0 +1,105 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Availability;
+
+use Unsupervised\Schedular\Offering\OfferingRepository;
+
+/**
+ * Validates a submitted availability window.
+ *
+ * The admin form and the REST endpoint both accept the same window, and used to
+ * check it independently — the endpoint returning a specific 400 for each
+ * failure while the form simply returned, saving nothing and saying nothing. A
+ * 30-minute window submitted with the default 60-minute lesson length was the
+ * visible symptom: no rows, no error, no clue. Both callers now come through
+ * here, so neither can drift from the other again.
+ *
+ * Every rejection is a `WP_Error` carrying a message written for the person who
+ * submitted the form: the endpoint returns it as-is (the `status` data makes it
+ * a 400), and the admin screen shows `get_error_message()` in a notice.
+ */
+class WindowValidator {
+
+	public function __construct( private OfferingRepository $offerings ) {}
+
+	/**
+	 * Check a submitted window and return it ready to persist.
+	 *
+	 * @param int    $instructorId    Instructor the window belongs to.
+	 * @param string $rawStart        Submitted start, in any form {@see AvailabilitySlot::normalizeDateTime()} accepts.
+	 * @param string $rawEnd          Submitted end, likewise.
+	 * @param int    $durationMinutes Lesson length the window is split into; 0 falls back to the 60-minute default.
+	 * @param int    $offeringId      Offering the slots are tied to, or 0 for any private lesson.
+	 *
+	 * @return AvailabilitySlot|\WP_Error The window, or why it was rejected.
+	 */
+	public function validate( int $instructorId, string $rawStart, string $rawEnd, int $durationMinutes, int $offeringId ): AvailabilitySlot|\WP_Error {
+		$startDt = AvailabilitySlot::normalizeDateTime( $rawStart );
+		$endDt   = AvailabilitySlot::normalizeDateTime( $rawEnd );
+
+		if ( null === $startDt || null === $endDt ) {
+			return new \WP_Error(
+				'invalid_datetime',
+				__( 'Enter a valid start and end date and time.', 'unsupervised-schedular' ),
+				[ 'status' => 400 ]
+			);
+		}
+
+		if ( $endDt <= $startDt ) {
+			return new \WP_Error(
+				'invalid_datetime',
+				__( 'The end time must be after the start time.', 'unsupervised-schedular' ),
+				[ 'status' => 400 ]
+			);
+		}
+
+		if ( substr( $startDt, 0, 10 ) !== substr( $endDt, 0, 10 ) ) {
+			return new \WP_Error(
+				'invalid_window',
+				__( 'Availability must start and end on the same day. Use the weekly repeat to cover multiple weeks.', 'unsupervised-schedular' ),
+				[ 'status' => 400 ]
+			);
+		}
+
+		// A slot may only be tied to an offering the instructor owns, so it can
+		// never inherit another instructor's price or payment routing at booking.
+		if ( $offeringId > 0 ) {
+			$offering = $this->offerings->findById( $offeringId );
+
+			if ( null === $offering || $offering->instructorId !== $instructorId ) {
+				return new \WP_Error(
+					'invalid_offering',
+					__( 'That offering is not available.', 'unsupervised-schedular' ),
+					[ 'status' => 400 ]
+				);
+			}
+		}
+
+		$duration = $durationMinutes > 0 ? $durationMinutes : AvailabilitySlot::DEFAULT_DURATION_MINUTES;
+
+		$window = new AvailabilitySlot(
+			instructorId:    $instructorId,
+			startDt:         $startDt,
+			endDt:           $endDt,
+			durationMinutes: $duration,
+			offeringId:      $offeringId > 0 ? $offeringId : null,
+		);
+
+		// The window is stored as lesson-length slots, so one that cannot fit a
+		// single lesson would persist nothing at all.
+		if ( [] === $window->splitByDuration() ) {
+			return new \WP_Error(
+				'invalid_window',
+				sprintf(
+					/* translators: %d: the selected lesson length, in minutes. */
+					__( 'This window is shorter than the %d-minute lesson length, so it holds no bookable slots. Choose a shorter lesson length or a longer window.', 'unsupervised-schedular' ),
+					$duration
+				),
+				[ 'status' => 400 ]
+			);
+		}
+
+		return $window;
+	}
+}

src/BlockPreview.php

@@ -0,0 +1,175 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular;
+
+/**
+ * Static, script-free markup for the editor previews of the front-end blocks.
+ *
+ * The booking and group-class pages are populated by JavaScript on the live
+ * site, and the registration page requires a valid invite token — none of
+ * which exist inside the block editor. These previews reproduce the same
+ * wrapper elements and CSS classes the live pages use, filled with
+ * representative placeholder content, so themes can be styled against
+ * realistic markup without firing REST calls, redirects, or Stripe.js.
+ */
+class BlockPreview {
+
+	/**
+	 * Sample booking page.
+	 *
+	 * @param string $mode Which halves the block embeds — one of
+	 *                     {@see Booking\BookingPage::MODE_BOTH},
+	 *                     `MODE_BOOKING` or `MODE_UPCOMING`. The preview shows
+	 *                     the same sections the published page would.
+	 */
+	public static function booking( string $mode = Booking\BookingPage::MODE_BOTH ): string {
+		if ( Booking\BookingPage::MODE_UPCOMING === $mode ) {
+			return sprintf(
+				'<div id="us-booking-app">%s<div id="us-my-lessons">%s</div></div>',
+				self::note( __( 'Editor preview — students see their own lessons on the published page.', 'unsupervised-schedular' ) ),
+				self::upcomingLessons()
+			);
+		}
+
+		$days = [
+			[
+				'label' => __( 'Monday', 'unsupervised-schedular' ),
+				'slots' => [
+					[ '4:00 PM–4:30 PM', 30 ],
+					[ '4:30 PM–5:00 PM', 30 ],
+				],
+			],
+			[
+				'label' => __( 'Wednesday', 'unsupervised-schedular' ),
+				'slots' => [
+					[ '5:00 PM–5:45 PM', 45 ],
+				],
+			],
+		];
+
+		$dayHtml = '';
+		foreach ( $days as $day ) {
+			$slotHtml = '';
+			foreach ( $day['slots'] as $slot ) {
+				$slotHtml .= sprintf(
+					'<div class="us-slot"><span>%s (%d min)</span><button type="button" class="us-book-btn" disabled>%s</button></div>',
+					esc_html( $slot[0] ),
+					(int) $slot[1],
+					esc_html__( 'Book', 'unsupervised-schedular' )
+				);
+			}
+
+			$dayHtml .= sprintf(
+				'<div class="us-day"><h3 class="us-day-heading">%s</h3>%s</div>',
+				esc_html( $day['label'] ),
+				$slotHtml
+			);
+		}
+
+		$lessons = Booking\BookingPage::MODE_BOOKING === $mode
+			? ''
+			: sprintf( '<div id="us-my-lessons">%s</div>', self::upcomingLessons() );
+
+		return sprintf(
+			'<div id="us-booking-app">%s%s<div id="us-slot-list">%s</div></div>',
+			self::note( __( 'Editor preview — students see live availability on the published page.', 'unsupervised-schedular' ) ),
+			$lessons,
+			$dayHtml
+		);
+	}
+
+	/**
+	 * Sample "your upcoming lessons" panel, shared by the booking preview's
+	 * full and upcoming-only modes.
+	 */
+	private static function upcomingLessons(): string {
+		return sprintf(
+			'<div class="us-my-lessons"><h3>%s</h3>'
+			. '<div class="us-my-lesson"><div class="us-my-lesson-info">'
+			. '<strong class="us-my-lesson-title">%s <span class="us-my-lesson-duration">(30 min)</span></strong>'
+			. '<span class="us-my-lesson-when">%s</span></div>'
+			. '<div class="us-my-lesson-actions">'
+			. '<span class="us-lesson-status us-lesson-status-confirmed">%s</span>'
+			. '<button type="button" class="us-cancel-lesson" disabled>%s</button>'
+			. '</div></div></div>',
+			esc_html__( 'Your upcoming lessons', 'unsupervised-schedular' ),
+			esc_html__( 'Piano Lesson', 'unsupervised-schedular' ),
+			esc_html__( 'Monday · 4:00 PM–4:30 PM', 'unsupervised-schedular' ),
+			esc_html__( 'Confirmed', 'unsupervised-schedular' ),
+			esc_html__( 'Cancel', 'unsupervised-schedular' )
+		);
+	}
+
+	/**
+	 * Sample group-class card.
+	 *
+	 * @param bool $singleClass Whether the block is pinned to one class, in
+	 *                          which case the live page omits the class
+	 *                          description and the preview does too.
+	 */
+	public static function groupClasses( bool $singleClass = false ): string {
+		$note = $singleClass
+			? __( 'Editor preview — the published page shows the chosen class with its live schedule and enrolment status.', 'unsupervised-schedular' )
+			: __( 'Editor preview — students see live group classes on the published page.', 'unsupervised-schedular' );
+
+		$description = $singleClass
+			? ''
+			: '<p>' . esc_html__( 'A sample class shown so the page can be styled.', 'unsupervised-schedular' ) . '</p>';
+
+		return sprintf(
+			'<div id="us-group-app">%s<div id="us-group-list"><div class="us-class"><h3>%s</h3><p class="us-class-when">%s</p>%s<p class="us-class-price">%s</p><p class="us-enrol-deadline">%s</p><button type="button" class="us-enrol-btn" disabled>%s</button></div></div></div>',
+			self::note( $note ),
+			esc_html__( 'Beginner Group Class', 'unsupervised-schedular' ),
+			esc_html__( 'Saturdays 10:00 AM–11:00 AM', 'unsupervised-schedular' ),
+			$description,
+			// Prices on the live page always carry their cadence, so the sample does too.
+			esc_html__( '25.00 CAD up front', 'unsupervised-schedular' ),
+			esc_html__( 'Enrol by Sep 6, 2026', 'unsupervised-schedular' ),
+			esc_html__( 'Enrol', 'unsupervised-schedular' )
+		);
+	}
+
+	/**
+	 * The live login form renders fine without any request state, so the
+	 * preview includes the real template (the editing user is logged in, which
+	 * would otherwise short-circuit to an "already logged in" message).
+	 */
+	public static function login(): string {
+		$error = '';
+
+		ob_start();
+		include USC_PLUGIN_DIR . 'templates/frontend/login-page.php';
+
+		return self::note( __( 'Editor preview — logged-in visitors are offered a link to the booking page instead.', 'unsupervised-schedular' ) ) . (string) ob_get_clean();
+	}
+
+	public static function registration(): string {
+		$fields  = sprintf(
+			'<p><label for="us-reg-email">%s</label><input type="email" id="us-reg-email" value="[email protected]" readonly></p>',
+			esc_html__( 'Email', 'unsupervised-schedular' )
+		);
+		$fields .= sprintf(
+			'<p><label for="us-reg-name">%s</label><input type="text" id="us-reg-name"></p>',
+			esc_html__( 'Your name', 'unsupervised-schedular' )
+		);
+		$fields .= sprintf(
+			'<p><label for="us-reg-pass">%s</label><input type="password" id="us-reg-pass"></p>',
+			esc_html__( 'Password', 'unsupervised-schedular' )
+		);
+		$fields .= sprintf(
+			'<p><input type="submit" value="%s" disabled></p>',
+			esc_attr__( 'Create Account', 'unsupervised-schedular' )
+		);
+
+		return sprintf(
+			'<div class="us-register-form">%s<form>%s</form></div>',
+			self::note( __( 'Editor preview — the live form requires a valid invite link and lists signup policies.', 'unsupervised-schedular' ) ),
+			$fields
+		);
+	}
+
+	private static function note( string $text ): string {
+		return '<p class="us-editor-note">' . esc_html( $text ) . '</p>';
+	}
+}

src/BlockRegistrar.php

@@ -0,0 +1,336 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular;
+
+use Unsupervised\Schedular\Auth\LoginPage;
+use Unsupervised\Schedular\Auth\RegistrationPage;
+use Unsupervised\Schedular\Booking\BookingPage;
+use Unsupervised\Schedular\GroupClass\GroupClassPage;
+
+/**
+ * Registers Gutenberg dynamic-block wrappers for the front-end shortcodes so
+ * the pages can be previewed and styled inside the block editor.
+ *
+ * On the front end each block delegates to the same page object its shortcode
+ * uses, so output is identical either way. Inside the editor (the
+ * block-renderer REST preview used by wp.serverSideRender) a static preview
+ * from BlockPreview is rendered instead — same markup and CSS classes, no
+ * live REST calls, redirects, or Stripe.js.
+ */
+class BlockRegistrar {
+
+	public const SCRIPT_HANDLE = 'us-scheduler-blocks';
+	public const STYLE_HANDLE  = 'us-scheduler';
+
+	public function __construct(
+		private BookingPage $bookingPage,
+		private LoginPage $loginPage,
+		private RegistrationPage $registrationPage,
+		private GroupClassPage $groupClassPage,
+	) {}
+
+	public function register(): void {
+		add_action( 'init', [ $this, 'registerBlocks' ] );
+		add_action( 'template_redirect', [ $this, 'maybeAutoRedirect' ] );
+	}
+
+	public function registerBlocks(): void {
+		// The editor script registers the client side of each block (title,
+		// icon, shortcode transform, inspector controls) and previews it via
+		// wp.serverSideRender.
+		wp_register_script(
+			self::SCRIPT_HANDLE,
+			USC_PLUGIN_URL . 'assets/js/blocks.js',
+			[ 'wp-blocks', 'wp-element', 'wp-block-editor', 'wp-components', 'wp-data', 'wp-core-data', 'wp-server-side-render', 'wp-i18n', 'wp-api-fetch' ],
+			USC_VERSION,
+			true
+		);
+
+		// The front-end stylesheet doubles as the block style so editor
+		// previews look like the published page. ShortcodeRegistrar registers
+		// the same handle on the front end, hence the guard.
+		if ( ! wp_style_is( self::STYLE_HANDLE, 'registered' ) ) {
+			wp_register_style( self::STYLE_HANDLE, USC_PLUGIN_URL . 'assets/css/frontend.css', [], USC_VERSION );
+		}
+
+		foreach ( $this->blocks() as $name => $config ) {
+			register_block_type(
+				$name,
+				[
+					'api_version'     => '3',
+					'editor_script'   => self::SCRIPT_HANDLE,
+					'style'           => self::STYLE_HANDLE,
+					'attributes'      => $config['attributes'],
+					'render_callback' => $config['render'],
+				]
+			);
+		}
+	}
+
+	/**
+	 * Block definitions: render callback plus the attribute schema. The
+	 * schema must be declared server-side too, or the block-renderer preview
+	 * endpoint rejects the attributes wp.serverSideRender sends.
+	 *
+	 * @return array<string, array{render: callable(array<string, mixed>=): string, attributes: array<string, array{type: string, default: mixed}>}>
+	 */
+	private function blocks(): array {
+		$redirectToggle = [
+			'type'    => 'boolean',
+			'default' => false,
+		];
+
+		return [
+			'us-scheduler/booking'          => [
+				'render'     => [ $this, 'renderBooking' ],
+				'attributes' => [
+					'loginPageId'    => [
+						'type'    => 'number',
+						'default' => 0,
+					],
+					'autoRedirect'   => $redirectToggle,
+					'lessonTypeId'   => [
+						'type'    => 'number',
+						'default' => 0,
+					],
+					'showTypeFilter' => [
+						'type'    => 'boolean',
+						'default' => true,
+					],
+					'displayMode'    => [
+						'type'    => 'string',
+						'default' => BookingPage::MODE_BOTH,
+					],
+				],
+			],
+			'us-scheduler/student-login'    => [
+				'render'     => [ $this, 'renderLogin' ],
+				'attributes' => [
+					'bookingPageId' => [
+						'type'    => 'number',
+						'default' => 0,
+					],
+					'autoRedirect'  => $redirectToggle,
+				],
+			],
+			'us-scheduler/student-register' => [
+				'render'     => [ $this, 'renderRegistration' ],
+				'attributes' => [
+					'loginPageId'       => [
+						'type'    => 'number',
+						'default' => 0,
+					],
+					'autoRedirect'      => $redirectToggle,
+					'inviteOnlyMessage' => [
+						'type'    => 'string',
+						'default' => '',
+					],
+				],
+			],
+			'us-scheduler/group-classes'    => [
+				'render'     => [ $this, 'renderGroupClasses' ],
+				'attributes' => [
+					'offeringId' => [
+						'type'    => 'number',
+						'default' => 0,
+					],
+				],
+			],
+		];
+	}
+
+	/**
+	 * Renders the booking block.
+	 *
+	 * @param array<string, mixed> $attributes Block attributes.
+	 */
+	public function renderBooking( array $attributes = [] ): string {
+		if ( ! $this->isEditorPreview() ) {
+			return $this->bookingPage->render( $attributes );
+		}
+
+		return BlockPreview::booking( Val::string( $attributes['displayMode'] ?? BookingPage::MODE_BOTH ) );
+	}
+
+	/**
+	 * Renders the student-login block.
+	 *
+	 * @param array<string, mixed> $attributes Block attributes.
+	 */
+	public function renderLogin( array $attributes = [] ): string {
+		return $this->isEditorPreview() ? BlockPreview::login() : $this->loginPage->render( $attributes );
+	}
+
+	/**
+	 * Renders the student-registration block.
+	 *
+	 * @param array<string, mixed> $attributes Block attributes.
+	 */
+	public function renderRegistration( array $attributes = [] ): string {
+		return $this->isEditorPreview() ? BlockPreview::registration() : $this->registrationPage->render( $attributes );
+	}
+
+	/**
+	 * Renders the group-classes block.
+	 *
+	 * @param array<string, mixed> $attributes Block attributes.
+	 */
+	public function renderGroupClasses( array $attributes = [] ): string {
+		if ( ! $this->isEditorPreview() ) {
+			return $this->groupClassPage->render( $attributes );
+		}
+
+		return BlockPreview::groupClasses( Val::int( $attributes['offeringId'] ?? 0 ) > 0 );
+	}
+
+	/**
+	 * Server-side auto-redirect for blocks that opt in via their autoRedirect
+	 * attribute: logged-out visitors on a page containing the booking block
+	 * are sent to its login page, logged-in visitors on a page containing the
+	 * student-login block are sent to its booking page, and a student who has
+	 * just finished registering is sent to the register block's chosen page.
+	 * Hooked on `template_redirect` because block rendering happens after
+	 * output has started, too late to send a Location header.
+	 */
+	public function maybeAutoRedirect(): void {
+		if ( is_admin() || ! is_singular() ) {
+			return;
+		}
+
+		$post = get_post();
+		if ( ! $post instanceof \WP_Post ) {
+			return;
+		}
+
+		if ( $this->maybeRedirectAfterRegistration( $post ) ) {
+			return;
+		}
+
+		if ( is_user_logged_in() ) {
+			$attrs = $this->firstBlockAttrs( $post->post_content, 'us-scheduler/student-login' );
+			if ( null === $attrs || ! Val::bool( $attrs['autoRedirect'] ?? false ) ) {
+				return;
+			}
+
+			$bookingPageId = Val::int( $attrs['bookingPageId'] ?? 0 );
+			if ( $bookingPageId === $post->ID ) {
+				return; // Redirecting the page to itself would loop.
+			}
+
+			$url = $this->loginPage->bookingUrl( $bookingPageId );
+			if ( null !== $url ) {
+				$this->redirect( $url );
+			}
+
+			return;
+		}
+
+		$attrs = $this->firstBlockAttrs( $post->post_content, 'us-scheduler/booking' );
+		if ( null === $attrs || ! Val::bool( $attrs['autoRedirect'] ?? false ) ) {
+			return;
+		}
+
+		$loginPageId = Val::int( $attrs['loginPageId'] ?? 0 );
+		if ( $loginPageId === $post->ID ) {
+			return; // Redirecting the page to itself would loop.
+		}
+
+		$this->redirect( $this->bookingPage->loginUrl( $loginPageId ) );
+	}
+
+	/**
+	 * Sends a student whose registration has just completed to the register
+	 * block's chosen page, when the block opts in. Only the finished states
+	 * qualify (see {@see RegistrationPage::isRegistrationComplete()}): a
+	 * failure or the "check your email" step stays put so its message is read.
+	 * Unlike the other blocks there is no login-screen fallback — with no page
+	 * chosen there is nowhere to send them, so the link is shown instead.
+	 *
+	 * Returns whether the redirect was issued (it only ever returns in tests;
+	 * {@see redirect()} exits in production).
+	 */
+	private function maybeRedirectAfterRegistration( \WP_Post $post ): bool {
+		// Checked before parsing the content because it is a couple of query
+		// args, whereas every front-end request would otherwise pay for a
+		// third block scan.
+		if ( ! $this->registrationPage->isRegistrationComplete() ) {
+			return false;
+		}
+
+		$attrs = $this->firstBlockAttrs( $post->post_content, 'us-scheduler/student-register' );
+		if ( null === $attrs || ! Val::bool( $attrs['autoRedirect'] ?? false ) ) {
+			return false;
+		}
+
+		$pageId = Val::int( $attrs['loginPageId'] ?? 0 );
+		if ( $pageId === $post->ID ) {
+			return false; // Redirecting the page to itself would loop.
+		}
+
+		$url = $this->registrationPage->continueUrl( $pageId );
+		if ( null === $url ) {
+			return false;
+		}
+
+		$this->redirect( $url );
+
+		return true;
+	}
+
+	/**
+	 * Attributes of the first occurrence of the named block in the content,
+	 * searching inner blocks so blocks nested inside groups or columns are
+	 * still found. Null when the block is absent. Attributes equal to their
+	 * schema default are omitted from the serialized block, so callers must
+	 * apply defaults themselves.
+	 *
+	 * @return array<mixed>|null
+	 */
+	private function firstBlockAttrs( string $content, string $blockName ): ?array {
+		if ( ! has_block( $blockName, $content ) ) {
+			return null;
+		}
+
+		$queue = parse_blocks( $content );
+
+		while ( [] !== $queue ) {
+			$block = array_shift( $queue );
+
+			if ( ! is_array( $block ) ) {
+				continue;
+			}
+
+			if ( ( $block['blockName'] ?? null ) === $blockName ) {
+				$attrs = $block['attrs'] ?? null;
+
+				return is_array( $attrs ) ? $attrs : [];
+			}
+
+			$inner = $block['innerBlocks'] ?? null;
+			if ( is_array( $inner ) && [] !== $inner ) {
+				$queue = array_merge( $queue, array_values( $inner ) );
+			}
+		}
+
+		return null;
+	}
+
+	/**
+	 * Issues the redirect and stops the request. Split out so tests can
+	 * observe redirects without the process exiting.
+	 */
+	protected function redirect( string $url ): void {
+		wp_safe_redirect( $url );
+		exit;
+	}
+
+	/**
+	 * Whether this render is the editor's block-renderer REST preview rather
+	 * than a real front-end page render. Front-end template rendering never
+	 * happens inside a REST request, so REST_REQUEST is a reliable signal.
+	 */
+	protected function isEditorPreview(): bool {
+		return defined( 'REST_REQUEST' ) && (bool) constant( 'REST_REQUEST' );
+	}
+}

src/Booking/BookingEndpoint.php

@@ -5,11 +5,13 @@ namespace Unsupervised\Schedular\Booking;
 
 use Unsupervised\Schedular\Availability\AvailabilityRepository;
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Offering\Offering;
 use Unsupervised\Schedular\Offering\OfferingRepository;
 use Unsupervised\Schedular\Payment\Payment;
 use Unsupervised\Schedular\Payment\PaymentService;
 use Unsupervised\Schedular\Policy\PolicyAcceptance;
 use Unsupervised\Schedular\Registration\RegistrationGate;
+use Unsupervised\Schedular\Val;
 
 class BookingEndpoint {
 
@@ -25,8 +27,14 @@ class BookingEndpoint {
 		private OfferingRepository $offerings,
 		private RegistrationGate $gate,
 		private PaymentService $payments,
+		private CancellationPolicy $cancellationPolicy,
 	) {}
 
+	/**
+	 * Registers this endpoint's REST routes.
+	 *
+	 * @param non-falsy-string $route_namespace REST namespace the routes are registered under (e.g. `us-scheduler/v1`).
+	 */
 	public function registerRoutes( string $route_namespace ): void {
 		register_rest_route(
 			$route_namespace,
@@ -73,6 +81,18 @@ class BookingEndpoint {
 			]
 		);
 
+		register_rest_route(
+			$route_namespace,
+			'/bookings/(?P<id>\d+)/cancel',
+			[
+				[
+					'methods'             => \WP_REST_Server::CREATABLE,
+					'callback'            => [ $this, 'cancel' ],
+					'permission_callback' => [ $this, 'isLoggedIn' ],
+				],
+			]
+		);
+
 		register_rest_route(
 			$route_namespace,
 			'/bookings/(?P<id>\d+)/status',
@@ -97,13 +117,38 @@ class BookingEndpoint {
 		$userId  = get_current_user_id();
 		$lessons = current_user_can( RoleManager::CAP_MANAGE_AVAILABILITY )
 			? $this->bookings->findUpcomingForInstructor( $userId )
-			: $this->bookings->findByStudent( $userId );
+			: $this->bookings->findUpcomingForStudent( $userId );
 
-		return new \WP_REST_Response( array_map( fn( Lesson $l ) => $l->toArray(), $lessons ), 200 );
+		return new \WP_REST_Response( array_map( fn( Lesson $l ): array => $this->lessonWithTimes( $l ), $lessons ), 200 );
+	}
+
+	/**
+	 * A lesson's array form plus its slot's start/end times and the booked
+	 * offering's name, so front-end lists can show what the session is and when
+	 * it happens without a second request.
+	 *
+	 * @return array<string, mixed>
+	 */
+	private function lessonWithTimes( Lesson $lesson ): array {
+		$slot     = $this->availability->findById( $lesson->slotId );
+		$offering = null !== $lesson->offeringId ? $this->offerings->findById( $lesson->offeringId ) : null;
+
+		// Prefer the offering's own length; fall back to the slot's when the
+		// offering has none (a generic, duration-less type).
+		$duration = null !== $offering && null !== $offering->durationMinutes
+			? $offering->durationMinutes
+			: $slot?->durationMinutes;
+
+		return $lesson->toArray() + [
+			'start_dt'         => $slot?->startDt,
+			'end_dt'           => $slot?->endDt,
+			'offering_title'   => $offering?->title,
+			'duration_minutes' => $duration,
+		];
 	}
 
 	public function book( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$slotId = (int) $request->get_param( 'slot_id' );
+		$slotId = Val::int( $request->get_param( 'slot_id' ) );
 		$slot   = $this->availability->findById( $slotId );
 
 		if ( null === $slot ) {
@@ -120,7 +165,7 @@ class BookingEndpoint {
 		// used must belong to the slot's instructor. This prevents substituting a
 		// cheaper/free offering to dodge payment, or another instructor's offering
 		// to misroute it.
-		$requestedOfferingId = absint( $request->get_param( 'offering_id' ) );
+		$requestedOfferingId = absint( Val::int( $request->get_param( 'offering_id' ) ) );
 		$slotOfferingId      = (int) ( $slot->offeringId ?? 0 );
 
 		if ( $slotOfferingId > 0 ) {
@@ -132,17 +177,37 @@ class BookingEndpoint {
 			$offeringId = $requestedOfferingId;
 		}
 
-		$offering = $offeringId > 0 ? $this->offerings->findById( $offeringId ) : null;
-		if ( $offeringId > 0 && null === $offering ) {
+		// Every lesson books against an offering: it carries the price, intake
+		// questions, and payment routing. Without one the booking would silently
+		// be free and unquestioned, so generic slots require the student's choice.
+		if ( $offeringId <= 0 ) {
+			return new \WP_Error( 'offering_required', __( 'Choose a lesson type to book this slot.', 'unsupervised-schedular' ), [ 'status' => 400 ] );
+		}
+
+		$offering = $this->offerings->findById( $offeringId );
+		if ( null === $offering ) {
 			return new \WP_Error( 'invalid_offering', __( 'Offering not found.', 'unsupervised-schedular' ), [ 'status' => 400 ] );
 		}
 
-		if ( null !== $offering && $offering->instructorId !== $slot->instructorId ) {
+		if ( $offering->instructorId !== $slot->instructorId ) {
 			return new \WP_Error( 'offering_mismatch', __( 'That offering is not available for this slot.', 'unsupervised-schedular' ), [ 'status' => 400 ] );
 		}
 
+		// A slot-tied offering was the instructor's explicit choice and is honoured
+		// as-is; a student-chosen one must be something the catalog actually offers
+		// for this slot: an active private-lesson type whose length fits the slot.
+		if ( 0 === $slotOfferingId ) {
+			if ( ! $offering->isActive || Offering::KIND_PRIVATE_LESSON !== $offering->kind ) {
+				return new \WP_Error( 'invalid_offering', __( 'That offering cannot be booked as a private lesson.', 'unsupervised-schedular' ), [ 'status' => 400 ] );
+			}
+
+			if ( null !== $offering->durationMinutes && $offering->durationMinutes !== $slot->durationMinutes ) {
+				return new \WP_Error( 'offering_mismatch', __( 'That offering does not match this slot\'s lesson length.', 'unsupervised-schedular' ), [ 'status' => 400 ] );
+			}
+		}
+
 		$answers            = $this->answers( $request );
-		$acceptedVersionIds = array_map( 'absint', (array) $request->get_param( 'accepted_policy_version_ids' ) );
+		$acceptedVersionIds = array_values( array_map( static fn( mixed $v ): int => absint( Val::int( $v ) ), (array) $request->get_param( 'accepted_policy_version_ids' ) ) );
 
 		$gateError = $this->gate->validate( $offeringId, $answers, $acceptedVersionIds );
 		if ( $gateError instanceof \WP_Error ) {
@@ -150,7 +215,7 @@ class BookingEndpoint {
 		}
 
 		$studentId  = get_current_user_id();
-		$notes      = (string) $request->get_param( 'notes' );
+		$notes      = Val::string( $request->get_param( 'notes' ) );
 		$recurrence = Lesson::RECURRENCE_WEEKLY === $request->get_param( 'recurrence' )
 			? Lesson::RECURRENCE_WEEKLY
 			: Lesson::RECURRENCE_SINGLE;
@@ -159,7 +224,7 @@ class BookingEndpoint {
 			slotId:       $slotId,
 			studentId:    $studentId,
 			instructorId: $slot->instructorId,
-			offeringId:   $offeringId > 0 ? $offeringId : null,
+			offeringId:   $offeringId,
 			recurrence:   $recurrence,
 			notes:        '' !== $notes ? $notes : null,
 		);
@@ -191,14 +256,48 @@ class BookingEndpoint {
 
 		$this->gate->record( PolicyAcceptance::REG_LESSON, $anchorId, $studentId, $offeringId, $answers, $acceptedVersionIds, $this->clientIp() );
 
-		if ( null !== $offering && $offering->price > 0.0 ) {
-			$this->payments->createForRegistration( Payment::REG_LESSON, $anchorId, $studentId, $slot->instructorId, $offering->price, $offering->currency, $offering->etransferEmail );
+		$payment = null;
+		$status  = Lesson::STATUS_PENDING;
+
+		// Scheduled billing (weekly / monthly) normally defers payment to the daily
+		// scan, but a single lesson booked once its scheduled due date has already
+		// passed — e.g. an extra lesson added to a month that was already billed — is
+		// charged at booking instead, so it is never missed or billed late.
+		$chargeAtBooking = $offering->price > 0.0 && (
+			! $offering->isScheduledBilling()
+			|| ( 1 === count( $ids ) && $this->scheduledDueHasPassed( $offering, $slot->startDt ) )
+		);
+
+		if ( $chargeAtBooking ) {
+			// A full-term price already covers the whole reservation; a per-lesson
+			// (one_time) price is owed once per occurrence actually claimed, so a
+			// weekly reservation cannot hold a term while paying for one week.
+			$amount = Offering::BILLING_FULL_TERM === $offering->billingMode
+				? $offering->price
+				: $offering->price * count( $ids );
+
+			$payment = $this->payments->createForRegistration( Payment::REG_LESSON, $anchorId, $studentId, $slot->instructorId, $amount, $offering->currency, $offering->etransferEmail );
+
+			if ( null !== $payment && $payment->isPaid() ) {
+				$status = Lesson::STATUS_CONFIRMED;
+			}
+		} else {
+			// Either a free offering, or scheduled billing (weekly / monthly) whose
+			// payment is deferred to the daily billing scan. Either way there is no
+			// payment step now to confirm the lessons, so the reserved slots are
+			// confirmed at booking time; the billing scan bills them when they come due.
+			foreach ( $ids as $lessonId ) {
+				$this->bookings->updateStatus( $lessonId, Lesson::STATUS_CONFIRMED );
+			}
+			$status = Lesson::STATUS_CONFIRMED;
 		}
 
+		// `payment: null` tells the front end to skip the payment step entirely.
 		return new \WP_REST_Response(
 			[
-				'ids'    => $ids,
-				'status' => Lesson::STATUS_PENDING,
+				'ids'     => $ids,
+				'status'  => $status,
+				'payment' => $payment?->toSummaryArray(),
 			],
 			201
 		);
@@ -212,21 +311,89 @@ class BookingEndpoint {
 	private function answers( \WP_REST_Request $request ): array {
 		$out = [];
 		foreach ( (array) $request->get_param( 'answers' ) as $questionId => $value ) {
-			$out[ (int) $questionId ] = sanitize_text_field( (string) $value );
+			$out[ (int) $questionId ] = sanitize_text_field( Val::string( $value ) );
 		}
 
 		return $out;
 	}
 
+	/**
+	 * Whether a scheduled-billing offering's due date for a given session has
+	 * already passed at booking time. Weekly bills 24 hours before the lesson;
+	 * monthly bills on the 1st, so its due moment has passed once "now" is in the
+	 * lesson's month or later. Only meaningful for weekly / monthly offerings.
+	 */
+	private function scheduledDueHasPassed( Offering $offering, string $slotStart ): bool {
+		$now   = new \DateTimeImmutable( Val::string( current_time( 'mysql' ) ) );
+		$start = new \DateTimeImmutable( $slotStart );
+
+		if ( Offering::BILLING_MONTHLY === $offering->billingMode ) {
+			return $now->format( 'Y-m-d' ) >= $start->format( 'Y-m-01' );
+		}
+
+		return $now >= $start->modify( '-1 day' );
+	}
+
 	private function clientIp(): ?string {
 		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash -- IP stored verbatim for audit.
-		$ip = sanitize_text_field( wp_unslash( $_SERVER['REMOTE_ADDR'] ?? '' ) );
+		$ip = sanitize_text_field( Val::string( wp_unslash( $_SERVER['REMOTE_ADDR'] ?? '' ) ) );
 
 		return '' !== $ip ? $ip : null;
 	}
 
+	/**
+	 * Student-initiated cancellation of their own lesson: marks it cancelled,
+	 * frees the slot for rebooking, and voids any still-pending payment. A lesson
+	 * already paid for is credited back to the student's account (a per-lesson
+	 * share of the covering payment) to offset their future scheduled billing.
+	 */
+	public function cancel( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
+		$id     = absint( Val::int( $request->get_param( 'id' ) ) );
+		$lesson = $this->bookings->findById( $id );
+
+		if ( null === $lesson ) {
+			return new \WP_Error( 'not_found', __( 'Booking not found.', 'unsupervised-schedular' ), [ 'status' => 404 ] );
+		}
+
+		if ( get_current_user_id() !== $lesson->studentId ) {
+			return new \WP_Error( 'forbidden', __( 'You cannot cancel this booking.', 'unsupervised-schedular' ), [ 'status' => 403 ] );
+		}
+
+		if ( Lesson::STATUS_CANCELLED !== $lesson->status ) {
+			$slot = $this->availability->findById( $lesson->slotId );
+			if ( null !== $slot ) {
+				$offering      = null !== $lesson->offeringId ? $this->offerings->findById( $lesson->offeringId ) : null;
+				$overrideHours = $offering?->cancellationCutoffHours;
+				if ( ! $this->cancellationPolicy->studentMayCancel( $slot->startDt, $overrideHours ) ) {
+					return new \WP_Error(
+						'cancellation_closed',
+						sprintf(
+							/* translators: %s: humanised cutoff window, e.g. "2 days" or "12 hours". */
+							__( 'This lesson can no longer be cancelled online — cancellations close %s before the lesson starts. Please contact the studio.', 'unsupervised-schedular' ),
+							$this->cancellationPolicy->describeCutoff( $this->cancellationPolicy->cutoffHours( $overrideHours ) )
+						),
+						[ 'status' => 403 ]
+					);
+				}
+			}
+
+			$this->bookings->updateStatus( $id, Lesson::STATUS_CANCELLED );
+			$this->availability->release( $lesson->slotId );
+			$this->payments->voidPending( $lesson->paymentId );
+			$this->payments->creditForCancelledLesson( $lesson );
+		}
+
+		return new \WP_REST_Response(
+			[
+				'id'     => $id,
+				'status' => Lesson::STATUS_CANCELLED,
+			],
+			200
+		);
+	}
+
 	public function updateStatus( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$id     = absint( $request->get_param( 'id' ) );
+		$id     = absint( Val::int( $request->get_param( 'id' ) ) );
 		$lesson = $this->bookings->findById( $id );
 
 		if ( null === $lesson ) {
@@ -237,12 +404,24 @@ class BookingEndpoint {
 			return new \WP_Error( 'forbidden', __( 'You cannot update this booking.', 'unsupervised-schedular' ), [ 'status' => 403 ] );
 		}
 
-		$this->bookings->updateStatus( $id, (string) $request->get_param( 'status' ) );
+		$status = Val::string( $request->get_param( 'status' ) );
+
+		if ( Lesson::STATUS_CANCELLED === $status && Lesson::STATUS_CANCELLED !== $lesson->status ) {
+			$this->availability->release( $lesson->slotId );
+			$this->payments->voidPending( $lesson->paymentId );
+			$this->payments->creditForCancelledLesson( $lesson );
+		} elseif ( Lesson::STATUS_CANCELLED === $lesson->status && Lesson::STATUS_CANCELLED !== $status && ! $this->availability->claim( $lesson->slotId ) ) {
+			// Reinstating a cancelled lesson must re-reserve its slot, and
+			// someone else may have booked the freed time in the meantime.
+			return new \WP_Error( 'slot_taken', __( 'This slot is already booked.', 'unsupervised-schedular' ), [ 'status' => 409 ] );
+		}
+
+		$this->bookings->updateStatus( $id, $status );
 
 		return new \WP_REST_Response(
 			[
 				'id'     => $id,
-				'status' => $request->get_param( 'status' ),
+				'status' => $status,
 			],
 			200
 		);

src/Booking/BookingPage.php

@@ -3,25 +3,53 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Booking;
 
+use Unsupervised\Schedular\Auth\RegistrationStatus;
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class BookingPage {
 
+	/** Booking calendar and the student's upcoming lessons (the default). */
+	public const MODE_BOTH = 'both';
+
+	/** Booking calendar only — no upcoming-lessons panel. */
+	public const MODE_BOOKING = 'booking';
+
+	/** The student's upcoming lessons only — nothing bookable. */
+	public const MODE_UPCOMING = 'upcoming';
+
 	/**
-	 * Renders the booking shortcode output.
+	 * Renders the booking shortcode/block output.
 	 *
-	 * @param array<string, string> $atts Shortcode attributes (unused — reserved for future options).
+	 * Supported attributes (block / shortcode form):
+	 * - `loginPageId` / `login_page_id` — where logged-out visitors are sent.
+	 * - `lessonTypeId` / `lesson_type` — a private-lesson offering id that pins
+	 *   the calendar to one lesson type: only the times bookable as that type
+	 *   are listed, and only it can be booked. 0 or absent shows every type.
+	 * - `showTypeFilter` / `show_filter` — whether the "Show Only" lesson-type
+	 *   filter is offered (default true; irrelevant when a type is pinned).
+	 * - `displayMode` / `show` — which halves of the page to embed:
+	 *   {@see self::MODE_BOTH} (default), {@see self::MODE_BOOKING} (calendar
+	 *   only) or {@see self::MODE_UPCOMING} (the student's lessons only).
+	 *
+	 * @param array<int|string, mixed> $atts Block or shortcode attributes.
 	 */
-	public function render( array $atts ): string { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.Found
+	public function render( array $atts ): string {
 		if ( ! is_user_logged_in() ) {
+			$loginPageId = Val::int( $atts['loginPageId'] ?? $atts['login_page_id'] ?? 0 );
+
 			return sprintf(
 				'<p>%s <a href="%s">%s</a>.</p>',
 				esc_html__( 'Please', 'unsupervised-schedular' ),
-				esc_url( wp_login_url( get_permalink() ) ),
+				esc_url( $this->loginUrl( $loginPageId ) ),
 				esc_html__( 'log in to book a lesson', 'unsupervised-schedular' )
 			);
 		}
 
+		if ( RegistrationStatus::isAwaitingApproval( get_current_user_id() ) ) {
+			return '<p>' . esc_html__( 'Your account is awaiting studio approval. You will be able to book once a studio admin approves it.', 'unsupervised-schedular' ) . '</p>';
+		}
+
 		if ( ! current_user_can( RoleManager::CAP_BOOK_LESSON ) ) {
 			return '<p>' . esc_html__( 'This page is for students only.', 'unsupervised-schedular' ) . '</p>';
 		}
@@ -29,8 +57,58 @@ class BookingPage {
 		wp_enqueue_style( 'us-scheduler' );
 		wp_enqueue_script( 'us-scheduler' );
 
+		$lessonTypeId   = absint( Val::int( $atts['lessonTypeId'] ?? $atts['lesson_type'] ?? 0 ) );
+		$showTypeFilter = self::toBool( $atts['showTypeFilter'] ?? $atts['show_filter'] ?? true );
+
+		$mode         = self::mode( $atts['displayMode'] ?? $atts['show'] ?? self::MODE_BOTH );
+		$showBooking  = self::MODE_UPCOMING !== $mode;
+		$showUpcoming = self::MODE_BOOKING !== $mode;
+
 		ob_start();
 		include USC_PLUGIN_DIR . 'templates/frontend/booking-page.php';
 		return (string) ob_get_clean();
 	}
+
+	/**
+	 * Normalises the display-mode attribute; anything unrecognised embeds the
+	 * whole page, so a typo never silently hides half of it.
+	 */
+	private static function mode( mixed $value ): string {
+		$mode = strtolower( trim( Val::string( $value ) ) );
+
+		return in_array( $mode, [ self::MODE_BOOKING, self::MODE_UPCOMING ], true ) ? $mode : self::MODE_BOTH;
+	}
+
+	/**
+	 * Reads a boolean attribute. Block attributes arrive as real booleans,
+	 * shortcode attributes as strings — where the words people actually write
+	 * for "off" ("no", "false", "off") are all truthy to PHP, so they are
+	 * matched explicitly rather than cast.
+	 */
+	private static function toBool( mixed $value ): bool {
+		if ( is_string( $value ) ) {
+			return ! in_array( strtolower( trim( $value ) ), [ '', '0', 'no', 'false', 'off' ], true );
+		}
+
+		return Val::bool( $value );
+	}
+
+	/**
+	 * URL the logged-out prompt sends visitors to: the chosen login page when
+	 * one is configured (and still exists), otherwise the WordPress login
+	 * screen with a redirect back to the current page.
+	 */
+	public function loginUrl( int $loginPageId ): string {
+		if ( $loginPageId > 0 ) {
+			$url = get_permalink( $loginPageId );
+
+			if ( is_string( $url ) ) {
+				return $url;
+			}
+		}
+
+		$permalink = get_permalink();
+
+		return wp_login_url( false === $permalink ? '' : $permalink );
+	}
 }

src/Booking/BookingRepository.php

@@ -80,7 +80,7 @@ class BookingRepository {
 
 	public function findById( int $id ): ?Lesson {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE id = %d", $id )
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
 		);
 
 		return $row ? Lesson::fromRow( $row ) : null;
@@ -96,12 +96,14 @@ class BookingRepository {
 
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT l.* FROM {$this->table} l
-                 JOIN {$avTable} a ON a.id = l.slot_id
+				'SELECT l.* FROM %i l
+                 JOIN %i a ON a.id = l.slot_id
                  WHERE l.instructor_id = %d
                    AND l.status != %s
                    AND a.start_dt >= %s
-                 ORDER BY a.start_dt ASC",
+                 ORDER BY a.start_dt ASC',
+				$this->table,
+				$avTable,
 				$instructorId,
 				Lesson::STATUS_CANCELLED,
 				current_time( 'mysql' )
@@ -111,6 +113,33 @@ class BookingRepository {
 		return array_map( Lesson::fromRow( ... ), $rows ?? [] );
 	}
 
+	/**
+	 * Upcoming lessons for a student (status != cancelled, slot in the future).
+	 *
+	 * @return list<Lesson>
+	 */
+	public function findUpcomingForStudent( int $studentId ): array {
+		$avTable = str_replace( 'us_lessons', 'us_availability', $this->table );
+
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT l.* FROM %i l
+                 JOIN %i a ON a.id = l.slot_id
+                 WHERE l.student_id = %d
+                   AND l.status != %s
+                   AND a.start_dt >= %s
+                 ORDER BY a.start_dt ASC',
+				$this->table,
+				$avTable,
+				$studentId,
+				Lesson::STATUS_CANCELLED,
+				current_time( 'mysql' )
+			)
+		);
+
+		return array_map( Lesson::fromRow( ... ), $rows ?? [] );
+	}
+
 	/**
 	 * Count a student's upcoming, non-cancelled lessons (slot in the future).
 	 */
@@ -119,11 +148,13 @@ class BookingRepository {
 
 		return (int) $this->db->get_var(
 			$this->db->prepare(
-				"SELECT COUNT(*) FROM {$this->table} l
-                 JOIN {$avTable} a ON a.id = l.slot_id
+				'SELECT COUNT(*) FROM %i l
+                 JOIN %i a ON a.id = l.slot_id
                  WHERE l.student_id = %d
                    AND l.status != %s
-                   AND a.start_dt >= %s",
+                   AND a.start_dt >= %s',
+				$this->table,
+				$avTable,
 				$studentId,
 				Lesson::STATUS_CANCELLED,
 				current_time( 'mysql' )
@@ -139,7 +170,8 @@ class BookingRepository {
 	public function findByStudent( int $studentId ): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE student_id = %d ORDER BY created_at DESC",
+				'SELECT * FROM %i WHERE student_id = %d ORDER BY created_at DESC',
+				$this->table,
 				$studentId
 			)
 		);
@@ -157,11 +189,13 @@ class BookingRepository {
 
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT l.* FROM {$this->table} l
-                 JOIN {$avTable} a ON a.id = l.slot_id
+				'SELECT l.* FROM %i l
+                 JOIN %i a ON a.id = l.slot_id
                  WHERE l.status != %s
                    AND a.start_dt >= %s
-                 ORDER BY a.start_dt ASC",
+                 ORDER BY a.start_dt ASC',
+				$this->table,
+				$avTable,
 				Lesson::STATUS_CANCELLED,
 				current_time( 'mysql' )
 			)
@@ -170,6 +204,76 @@ class BookingRepository {
 		return array_map( Lesson::fromRow( ... ), $rows ?? [] );
 	}
 
+	/**
+	 * Not-yet-billed lessons on a scheduled-billing (weekly / monthly) offering:
+	 * status not cancelled and no payment attached yet. Each row carries the slot
+	 * start time and the offering's billing fields so the daily billing scan can
+	 * decide what is due without a second query per lesson. Ordered by student,
+	 * offering and time so the scan can group a student's monthly lessons cheaply.
+	 *
+	 * @return list<\stdClass> Rows: id, student_id, instructor_id, offering_id,
+	 *                         start_dt, billing_mode, title, price, currency,
+	 *                         etransfer_email.
+	 */
+	public function findUnbilledScheduledLessons(): array {
+		$avTable  = str_replace( 'us_lessons', 'us_availability', $this->table );
+		$offTable = str_replace( 'us_lessons', 'us_offerings', $this->table );
+
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT l.id, l.student_id, l.instructor_id, l.offering_id,
+				        a.start_dt,
+				        o.billing_mode, o.title, o.price, o.currency, o.etransfer_email
+				 FROM %i l
+				 JOIN %i a ON a.id = l.slot_id
+				 JOIN %i o ON o.id = l.offering_id
+				 WHERE l.status != %s
+				   AND l.payment_id IS NULL
+				   AND o.billing_mode IN ( %s, %s )
+				 ORDER BY l.student_id ASC, l.offering_id ASC, a.start_dt ASC',
+				$this->table,
+				$avTable,
+				$offTable,
+				Lesson::STATUS_CANCELLED,
+				\Unsupervised\Schedular\Offering\Offering::BILLING_WEEKLY,
+				\Unsupervised\Schedular\Offering\Offering::BILLING_MONTHLY
+			)
+		);
+
+		return $rows ?? [];
+	}
+
+	/**
+	 * How many lessons a payment covers — every lesson pointed at it, cancelled or
+	 * not, since the payment was billed for all of them. Used to split a paid
+	 * payment's total into a per-lesson share when one covered lesson is cancelled
+	 * and credited. Never below zero.
+	 */
+	public function countByPaymentId( int $paymentId ): int {
+		return (int) $this->db->get_var(
+			$this->db->prepare(
+				'SELECT COUNT(*) FROM %i WHERE payment_id = %d',
+				$this->table,
+				$paymentId
+			)
+		);
+	}
+
+	/**
+	 * How many lessons belong to a weekly series — the whole reservation an upfront
+	 * (full-term) payment covers, so cancelling one lesson credits its per-lesson
+	 * share. Counts every lesson in the series, cancelled or not.
+	 */
+	public function countBySeries( int $seriesId ): int {
+		return (int) $this->db->get_var(
+			$this->db->prepare(
+				'SELECT COUNT(*) FROM %i WHERE series_id = %d',
+				$this->table,
+				$seriesId
+			)
+		);
+	}
+
 	public function setPaymentId( int $id, int $paymentId ): bool {
 		return false !== $this->db->update(
 			$this->table,
@@ -180,6 +284,26 @@ class BookingRepository {
 		);
 	}
 
+	/**
+	 * Update every non-cancelled lesson in a weekly series at once — e.g.
+	 * confirming the whole reservation when its single upfront payment settles.
+	 */
+	public function updateStatusForSeries( int $seriesId, string $status ): bool {
+		if ( ! in_array( $status, Lesson::VALID_STATUSES, true ) ) {
+			return false;
+		}
+
+		$sql = $this->db->prepare(
+			'UPDATE %i SET status = %s WHERE series_id = %d AND status != %s',
+			$this->table,
+			$status,
+			$seriesId,
+			Lesson::STATUS_CANCELLED
+		);
+
+		return null !== $sql && false !== $this->db->query( $sql );
+	}
+
 	public function updateStatus( int $id, string $status ): bool {
 		if ( ! in_array( $status, Lesson::VALID_STATUSES, true ) ) {
 			return false;

src/Booking/CancellationPolicy.php

@@ -0,0 +1,69 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Booking;
+
+use Unsupervised\Schedular\Payment\StudioSettings;
+
+/**
+ * Decides whether a student may still cancel a lesson. Cancellation closes once
+ * the lesson starts within the effective cutoff window; instructors and studio
+ * admins bypass this entirely and cancel through other paths.
+ *
+ * The window is resolved per lesson: the offering's own cutoff when it sets one,
+ * otherwise the studio default. Both are expressed in hours.
+ */
+class CancellationPolicy {
+
+	public function __construct( private StudioSettings $settings ) {}
+
+	/**
+	 * The effective cutoff in hours for a lesson: the offering's override when
+	 * set (a non-negative value), otherwise the studio default.
+	 */
+	public function cutoffHours( ?int $offeringCutoffHours ): int {
+		if ( null !== $offeringCutoffHours && $offeringCutoffHours >= 0 ) {
+			return $offeringCutoffHours;
+		}
+
+		return $this->settings->cancellationCutoffHours();
+	}
+
+	/**
+	 * Whether a student may still cancel a lesson starting at $slotStartDt
+	 * (WordPress-local `Y-m-d H:i:s`), given the offering's optional cutoff
+	 * override. A zero cutoff always allows cancellation; unparseable input
+	 * fails open so a student is never trapped by bad data. Pass $now to make
+	 * the comparison deterministic in tests.
+	 */
+	public function studentMayCancel( string $slotStartDt, ?int $offeringCutoffHours, ?string $now = null ): bool {
+		$hours = $this->cutoffHours( $offeringCutoffHours );
+		if ( $hours <= 0 ) {
+			return true;
+		}
+
+		$start   = strtotime( $slotStartDt );
+		$current = strtotime( $now ?? current_time( 'mysql' ) );
+		if ( false === $start || false === $current ) {
+			return true;
+		}
+
+		return ( $start - $current ) >= $hours * 3600;
+	}
+
+	/**
+	 * A human-readable description of a cutoff for student-facing messages:
+	 * whole days as days, anything else as hours.
+	 */
+	public function describeCutoff( int $hours ): string {
+		if ( $hours > 0 && 0 === $hours % 24 ) {
+			$days = $hours / 24;
+
+			/* translators: %d: number of days. */
+			return sprintf( _n( '%d day', '%d days', $days, 'unsupervised-schedular' ), $days );
+		}
+
+		/* translators: %d: number of hours. */
+		return sprintf( _n( '%d hour', '%d hours', $hours, 'unsupervised-schedular' ), $hours );
+	}
+}

src/Booking/Lesson.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Booking;
 
+use Unsupervised\Schedular\Val;
+
 class Lesson {
 
 	public const STATUS_PENDING   = 'pending';
@@ -39,18 +41,18 @@ class Lesson {
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			slotId:       (int) $row->slot_id,
-			studentId:    (int) $row->student_id,
-			instructorId: (int) $row->instructor_id,
-			offeringId:   null !== $row->offering_id ? (int) $row->offering_id : null,
-			recurrence:   $row->recurrence,
-			seriesId:     null !== $row->series_id ? (int) $row->series_id : null,
-			status:       $row->status,
-			paymentId:    null !== $row->payment_id ? (int) $row->payment_id : null,
-			notes:        $row->notes,
-			id:           (int) $row->id,
+			slotId:       Val::int( $row->slot_id ),
+			studentId:    Val::int( $row->student_id ),
+			instructorId: Val::int( $row->instructor_id ),
+			offeringId:   Val::intOrNull( $row->offering_id ),
+			recurrence:   Val::string( $row->recurrence ),
+			seriesId:     Val::intOrNull( $row->series_id ),
+			status:       Val::string( $row->status ),
+			paymentId:    Val::intOrNull( $row->payment_id ),
+			notes:        Val::stringOrNull( $row->notes ),
+			id:           Val::int( $row->id ),
 		);
 	}
 

src/Booking/LessonController.php

@@ -4,14 +4,22 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Booking;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Availability\AvailabilityRepository;
+use Unsupervised\Schedular\Availability\AvailabilitySlot;
+use Unsupervised\Schedular\Availability\WeekCalendar;
+use Unsupervised\Schedular\Offering\OfferingRepository;
 use Unsupervised\Schedular\Payment\Payment;
 use Unsupervised\Schedular\Payment\PaymentRepository;
+use Unsupervised\Schedular\Val;
 
 class LessonController {
 
 	public function __construct(
 		private BookingRepository $repository,
 		private PaymentRepository $payments,
+		private AvailabilityRepository $availability,
+		private OfferingRepository $offerings,
+		private LessonDetail $detail,
 	) {}
 
 	public function renderAdminDashboard(): void {
@@ -19,11 +27,15 @@ class LessonController {
 			wp_die( esc_html__( 'You do not have permission to view this page.', 'unsupervised-schedular' ) );
 		}
 
+		if ( $this->maybeRenderDetail( 'us-scheduler', false ) ) {
+			return;
+		}
+
 		$this->handleEtransferUpdate( false );
 
 		$rows = array_map( fn( Lesson $lesson ): array => $this->row( $lesson ), $this->repository->findAllUpcoming() );
 
-		include USC_PLUGIN_DIR . 'templates/admin/lessons.php';
+		$this->renderLessonsPage( $rows, 'us-scheduler' );
 	}
 
 	public function renderInstructorLessons(): void {
@@ -31,10 +43,67 @@ class LessonController {
 			wp_die( esc_html__( 'You do not have permission to view lessons.', 'unsupervised-schedular' ) );
 		}
 
+		if ( $this->maybeRenderDetail( 'us-my-lessons', true ) ) {
+			return;
+		}
+
 		$this->handleEtransferUpdate( true );
 
 		$rows = array_map( fn( Lesson $lesson ): array => $this->row( $lesson ), $this->repository->findUpcomingForInstructor( get_current_user_id() ) );
 
+		$this->renderLessonsPage( $rows, 'us-my-lessons' );
+	}
+
+	/**
+	 * When the request targets a single lesson (`?lesson_id=`), render its detail
+	 * view and report that the page has been handled. Instructors may only open
+	 * their own lessons; the studio dashboard ($onlyOwn = false) may open any.
+	 */
+	private function maybeRenderDetail( string $pageSlug, bool $onlyOwn ): bool {
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only lesson selector.
+		$lessonId = absint( Val::int( $_GET['lesson_id'] ?? 0 ) );
+		if ( $lessonId <= 0 ) {
+			return false;
+		}
+
+		$lesson  = $this->repository->findById( $lessonId );
+		$backUrl = admin_url( 'admin.php?page=' . $pageSlug );
+
+		if ( null === $lesson || ( $onlyOwn && get_current_user_id() !== $lesson->instructorId ) ) {
+			$row     = null;
+			$answers = [];
+			$accepts = [];
+		} else {
+			$row     = $this->row( $lesson );
+			$answers = $this->detail->answers( $lessonId );
+			$accepts = $this->detail->acceptances( $lessonId );
+		}
+
+		include USC_PLUGIN_DIR . 'templates/admin/lesson-detail.php';
+
+		return true;
+	}
+
+	/**
+	 * Render the lessons template with its calendar view state: week (default)
+	 * or list, plus which week the week view shows.
+	 *
+	 * @param list<array<string, mixed>> $rows
+	 */
+	private function renderLessonsPage( array $rows, string $pageSlug ): void {
+		// View-state query params only (which view, which week) — nothing is
+		// mutated from them, so no nonce applies.
+		// phpcs:disable WordPress.Security.NonceVerification.Recommended
+		$view          = 'list' === sanitize_key( Val::string( wp_unslash( $_GET['usc_view'] ?? '' ) ) ) ? 'list' : 'week';
+		$requestedWeek = sanitize_text_field( Val::string( wp_unslash( $_GET['usc_week'] ?? '' ) ) );
+		// phpcs:enable WordPress.Security.NonceVerification.Recommended
+
+		$weekStart = WeekCalendar::weekStart( $requestedWeek, Val::int( get_option( 'start_of_week', 1 ) ), current_time( 'Y-m-d' ) );
+		$weekDays  = WeekCalendar::bucket( $weekStart, $rows, static fn( array $row ): string => Val::string( $row['day'] ) );
+		$prevWeek  = ( new \DateTimeImmutable( $weekStart ) )->modify( '-7 days' )->format( 'Y-m-d' );
+		$nextWeek  = ( new \DateTimeImmutable( $weekStart ) )->modify( '+7 days' )->format( 'Y-m-d' );
+		$baseUrl   = admin_url( 'admin.php?page=' . $pageSlug );
+
 		include USC_PLUGIN_DIR . 'templates/admin/lessons.php';
 	}
 
@@ -48,10 +117,11 @@ class LessonController {
 		}
 
 		// phpcs:disable WordPress.Security.NonceVerification.Missing -- nonce checked above.
-		$action    = sanitize_key( wp_unslash( $_POST['usc_action'] ?? '' ) );
-		$paymentId = absint( $_POST['payment_id'] ?? 0 );
-		$email     = sanitize_email( wp_unslash( $_POST['etransfer_email'] ?? '' ) );
-		$taxRate   = isset( $_POST['tax_rate'] ) ? max( 0.0, (float) $_POST['tax_rate'] ) : 0.0;
+		$action    = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ) ) );
+		$paymentId = absint( Val::int( $_POST['payment_id'] ?? 0 ) );
+		$email     = sanitize_email( Val::string( wp_unslash( $_POST['etransfer_email'] ?? '' ) ) );
+		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Val::float() coerces to float; slashes cannot survive numeric coercion.
+		$taxRate = isset( $_POST['tax_rate'] ) ? max( 0.0, Val::float( $_POST['tax_rate'] ) ) : 0.0;
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
 
 		if ( $paymentId <= 0 || ! in_array( $action, [ 'set_etransfer', 'set_tax' ], true ) ) {
@@ -81,11 +151,19 @@ class LessonController {
 		$student    = get_userdata( $lesson->studentId );
 		$instructor = get_userdata( $lesson->instructorId );
 		$payment    = null !== $lesson->paymentId ? $this->payments->findById( $lesson->paymentId ) : null;
+		$slot       = $this->availability->findById( $lesson->slotId );
+		$offering   = null !== $lesson->offeringId ? $this->offerings->findById( $lesson->offeringId ) : null;
 
 		return [
+			'lesson_id'          => (int) $lesson->id,
 			'student'            => $student ? $student->display_name : (string) $lesson->studentId,
 			'instructor'         => $instructor ? $instructor->display_name : (string) $lesson->instructorId,
-			'slot_id'            => (int) $lesson->slotId,
+			'offering'           => $offering ? $offering->title : '—',
+			'duration'           => null !== $offering && null !== $offering->durationMinutes ? $offering->durationMinutes : 0,
+			'recurrence'         => $lesson->recurrence,
+			'time'               => $slot ? $this->formatSlotTime( $slot ) : '—',
+			'day'                => $slot ? substr( $slot->startDt, 0, 10 ) : '',
+			'time_short'         => $slot ? Val::string( mysql2date( 'g:i A', $slot->startDt ) ) : '—',
 			'status'             => $lesson->status,
 			'notes'              => $lesson->notes ?? '',
 			'payment_id'         => $payment ? (int) $payment->id : 0,
@@ -99,4 +177,16 @@ class LessonController {
 			'tax_editable'       => null !== $payment && ! $payment->isPaid(),
 		];
 	}
+
+	/**
+	 * Format a slot's window as e.g. "Jul 6, 2026 9:00 AM–10:00 AM", repeating the
+	 * date on the end time only when the slot crosses midnight.
+	 */
+	private function formatSlotTime( AvailabilitySlot $slot ): string {
+		$sameDay = substr( $slot->startDt, 0, 10 ) === substr( $slot->endDt, 0, 10 );
+
+		return Val::string( mysql2date( 'M j, Y g:i A', $slot->startDt ) )
+			. '–'
+			. Val::string( mysql2date( $sameDay ? 'g:i A' : 'M j, Y g:i A', $slot->endDt ) );
+	}
 }

src/Booking/LessonDetail.php

@@ -0,0 +1,73 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Booking;
+
+use Unsupervised\Schedular\Policy\AcceptanceRepository;
+use Unsupervised\Schedular\Policy\PolicyAcceptance;
+use Unsupervised\Schedular\Policy\PolicyRepository;
+use Unsupervised\Schedular\Policy\PolicyVersionRepository;
+use Unsupervised\Schedular\Registration\Answer;
+use Unsupervised\Schedular\Registration\AnswerRepository;
+use Unsupervised\Schedular\Registration\QuestionRepository;
+
+/**
+ * Builds the display rows for the admin lesson detail view: the intake answers
+ * the student submitted and the policy versions they accepted when booking.
+ *
+ * Scoped to a single lesson (the `lesson` registration type), mirroring the
+ * per-student history in {@see \Unsupervised\Schedular\Auth\StudentHistory}.
+ */
+class LessonDetail {
+
+	public function __construct(
+		private AnswerRepository $answers,
+		private QuestionRepository $questions,
+		private AcceptanceRepository $acceptances,
+		private PolicyRepository $policies,
+		private PolicyVersionRepository $versions,
+	) {}
+
+	/**
+	 * The intake-question answers recorded for this lesson, in submission order.
+	 *
+	 * @return list<array{question: string, answer: string}>
+	 */
+	public function answers( int $lessonId ): array {
+		return array_map(
+			function ( Answer $answer ): array {
+				$question = $this->questions->findById( $answer->questionId );
+				$value    = $answer->answerValue ?? '';
+
+				return [
+					'question' => $question ? $question->label : sprintf( '#%d', $answer->questionId ),
+					'answer'   => '' === $value ? '—' : $value,
+				];
+			},
+			$this->answers->findByRegistration( Answer::REG_LESSON, $lessonId )
+		);
+	}
+
+	/**
+	 * The policy versions the student accepted when booking this lesson, with the
+	 * captured acceptance time and IP for the audit trail.
+	 *
+	 * @return list<array{policy: string, version: string, accepted_at: string, ip: string}>
+	 */
+	public function acceptances( int $lessonId ): array {
+		return array_map(
+			function ( PolicyAcceptance $acceptance ): array {
+				$version = $this->versions->findById( $acceptance->policyVersionId );
+				$policy  = $version ? $this->policies->findById( $version->policyId ) : null;
+
+				return [
+					'policy'      => $policy ? $policy->title : sprintf( '#%d', $acceptance->policyVersionId ),
+					'version'     => $version ? sprintf( 'v%d', $version->versionNumber ) : '—',
+					'accepted_at' => $acceptance->acceptedAt ?? '',
+					'ip'          => $acceptance->ipAddress ?? '',
+				];
+			},
+			$this->acceptances->findByRegistration( PolicyAcceptance::REG_LESSON, $lessonId )
+		);
+	}
+}

src/GroupClass/Enrollment.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\GroupClass;
 
+use Unsupervised\Schedular\Val;
+
 class Enrollment {
 
 	public const STATUS_ACTIVE    = 'active';
@@ -25,14 +27,14 @@ class Enrollment {
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			offeringId:   (int) $row->offering_id,
-			studentId:    (int) $row->student_id,
-			instructorId: (int) $row->instructor_id,
-			status:       $row->status,
-			paymentId:    null !== $row->payment_id ? (int) $row->payment_id : null,
-			id:           (int) $row->id,
+			offeringId:   Val::int( $row->offering_id ),
+			studentId:    Val::int( $row->student_id ),
+			instructorId: Val::int( $row->instructor_id ),
+			status:       Val::string( $row->status ),
+			paymentId:    Val::intOrNull( $row->payment_id ),
+			id:           Val::int( $row->id ),
 		);
 	}
 

src/GroupClass/EnrollmentEndpoint.php

@@ -10,6 +10,7 @@ use Unsupervised\Schedular\Payment\Payment;
 use Unsupervised\Schedular\Payment\PaymentService;
 use Unsupervised\Schedular\Policy\PolicyAcceptance;
 use Unsupervised\Schedular\Registration\RegistrationGate;
+use Unsupervised\Schedular\Val;
 
 class EnrollmentEndpoint {
 
@@ -18,8 +19,14 @@ class EnrollmentEndpoint {
 		private OfferingRepository $offerings,
 		private RegistrationGate $gate,
 		private PaymentService $payments,
+		private GroupAccessRepository $access,
 	) {}
 
+	/**
+	 * Registers this endpoint's REST routes.
+	 *
+	 * @param non-falsy-string $route_namespace REST namespace the routes are registered under (e.g. `us-scheduler/v1`).
+	 */
 	public function registerRoutes( string $route_namespace ): void {
 		register_rest_route(
 			$route_namespace,
@@ -52,6 +59,18 @@ class EnrollmentEndpoint {
 				],
 			]
 		);
+
+		register_rest_route(
+			$route_namespace,
+			'/enrollments/(?P<id>\d+)/withdraw',
+			[
+				[
+					'methods'             => \WP_REST_Server::CREATABLE,
+					'callback'            => [ $this, 'withdraw' ],
+					'permission_callback' => [ $this, 'isLoggedIn' ],
+				],
+			]
+		);
 	}
 
 	public function index( \WP_REST_Request $request ): \WP_REST_Response { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.Found
@@ -69,7 +88,7 @@ class EnrollmentEndpoint {
 	}
 
 	public function enroll( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$offeringId = absint( $request->get_param( 'offering_id' ) );
+		$offeringId = absint( Val::int( $request->get_param( 'offering_id' ) ) );
 		$offering   = $this->offerings->findById( $offeringId );
 
 		if ( null === $offering || Offering::KIND_GROUP_CLASS !== $offering->kind ) {
@@ -82,12 +101,24 @@ class EnrollmentEndpoint {
 			return new \WP_Error( 'already_enrolled', __( 'You are already enrolled in this class.', 'unsupervised-schedular' ), [ 'status' => 409 ] );
 		}
 
+		// Invite-only classes can only be enrolled in by students who were granted
+		// access (or added directly); everyone else never sees the class at all.
+		if ( $offering->isInviteOnly() && ! $this->access->hasGrant( $offeringId, $studentId ) ) {
+			return new \WP_Error( 'invite_required', __( 'This class is by invitation only.', 'unsupervised-schedular' ), [ 'status' => 403 ] );
+		}
+
+		// Enrolment closes at the end of the deadline day — the instructor's set
+		// deadline, or the first class day by default.
+		if ( ! $offering->isEnrollmentOpen( Val::string( current_time( 'Y-m-d' ) ) ) ) {
+			return new \WP_Error( 'enrollment_closed', __( 'Enrolment for this class has closed.', 'unsupervised-schedular' ), [ 'status' => 403 ] );
+		}
+
 		if ( null !== $offering->capacity && $this->enrollments->countActiveForOffering( $offeringId ) >= $offering->capacity ) {
 			return new \WP_Error( 'class_full', __( 'This class is full.', 'unsupervised-schedular' ), [ 'status' => 409 ] );
 		}
 
 		$answers            = $this->answers( $request );
-		$acceptedVersionIds = array_map( 'absint', (array) $request->get_param( 'accepted_policy_version_ids' ) );
+		$acceptedVersionIds = array_values( array_map( static fn( mixed $v ): int => absint( Val::int( $v ) ), (array) $request->get_param( 'accepted_policy_version_ids' ) ) );
 
 		$gateError = $this->gate->validate( $offeringId, $answers, $acceptedVersionIds );
 		if ( $gateError instanceof \WP_Error ) {
@@ -104,16 +135,72 @@ class EnrollmentEndpoint {
 
 		$this->gate->record( PolicyAcceptance::REG_ENROLLMENT, $id, $studentId, $offeringId, $answers, $acceptedVersionIds, $this->clientIp() );
 
-		if ( $offering->price > 0.0 ) {
-			$this->payments->createForRegistration( Payment::REG_ENROLLMENT, $id, $studentId, $offering->instructorId, $offering->price, $offering->currency, $offering->etransferEmail );
+		// Mark the access grant used so instructor rosters distinguish invited
+		// students from enrolled ones (a no-op for public classes).
+		if ( $offering->isInviteOnly() ) {
+			$this->access->markEnrolled( $offeringId, $studentId );
+		}
+
+		// Scheduled billing (weekly / monthly) is generated later by the daily
+		// billing scan, so nothing is charged at enrolment; the enrolment is active
+		// regardless of payment.
+		$payment = null;
+		if ( $offering->price > 0.0 && ! $offering->isScheduledBilling() ) {
+			$payment = $this->payments->createForRegistration( Payment::REG_ENROLLMENT, $id, $studentId, $offering->instructorId, $offering->price, $offering->currency, $offering->etransferEmail );
+		}
+
+		// `payment: null` tells the front end to skip the payment step entirely.
+		return new \WP_REST_Response(
+			[
+				'id'      => $id,
+				'status'  => Enrollment::STATUS_ACTIVE,
+				'payment' => $payment?->toSummaryArray(),
+			],
+			201
+		);
+	}
+
+	/**
+	 * Withdraw the current student from a group class they enrolled in. Allowed
+	 * only while the offering's withdrawal deadline is open (a class with no
+	 * deadline set stays open indefinitely); once it passes, the student must
+	 * contact the studio and an admin withdraws them by hand. A timely withdrawal
+	 * frees the seat and voids any still-pending payment but never issues an
+	 * account credit — that is reserved for cancelled lessons.
+	 */
+	public function withdraw( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
+		$id         = absint( Val::int( $request->get_param( 'id' ) ) );
+		$enrollment = $this->enrollments->findById( $id );
+
+		if ( null === $enrollment ) {
+			return new \WP_Error( 'not_found', __( 'Enrolment not found.', 'unsupervised-schedular' ), [ 'status' => 404 ] );
+		}
+
+		if ( get_current_user_id() !== $enrollment->studentId ) {
+			return new \WP_Error( 'forbidden', __( 'You cannot withdraw from this class.', 'unsupervised-schedular' ), [ 'status' => 403 ] );
+		}
+
+		if ( Enrollment::STATUS_ACTIVE === $enrollment->status ) {
+			$offering = $this->offerings->findById( $enrollment->offeringId );
+
+			if ( null !== $offering && ! $offering->isWithdrawalOpen( Val::string( current_time( 'Y-m-d' ) ) ) ) {
+				return new \WP_Error(
+					'withdrawal_closed',
+					__( 'Withdrawal for this class has closed. Please contact the studio.', 'unsupervised-schedular' ),
+					[ 'status' => 403 ]
+				);
+			}
+
+			$this->enrollments->updateStatus( $id, Enrollment::STATUS_CANCELLED );
+			$this->payments->voidPending( $enrollment->paymentId );
 		}
 
 		return new \WP_REST_Response(
 			[
 				'id'     => $id,
-				'status' => Enrollment::STATUS_ACTIVE,
+				'status' => Enrollment::STATUS_CANCELLED,
 			],
-			201
+			200
 		);
 	}
 
@@ -133,7 +220,7 @@ class EnrollmentEndpoint {
 	private function answers( \WP_REST_Request $request ): array {
 		$out = [];
 		foreach ( (array) $request->get_param( 'answers' ) as $questionId => $value ) {
-			$out[ (int) $questionId ] = sanitize_text_field( (string) $value );
+			$out[ (int) $questionId ] = sanitize_text_field( Val::string( $value ) );
 		}
 
 		return $out;
@@ -141,7 +228,7 @@ class EnrollmentEndpoint {
 
 	private function clientIp(): ?string {
 		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash -- IP stored verbatim for audit.
-		$ip = sanitize_text_field( wp_unslash( $_SERVER['REMOTE_ADDR'] ?? '' ) );
+		$ip = sanitize_text_field( Val::string( wp_unslash( $_SERVER['REMOTE_ADDR'] ?? '' ) ) );
 
 		return '' !== $ip ? $ip : null;
 	}

src/GroupClass/EnrollmentRepository.php

@@ -30,7 +30,7 @@ class EnrollmentRepository {
 
 	public function findById( int $id ): ?Enrollment {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE id = %d", $id )
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
 		);
 
 		return $row ? Enrollment::fromRow( $row ) : null;
@@ -42,7 +42,8 @@ class EnrollmentRepository {
 	public function countActiveForOffering( int $offeringId ): int {
 		return (int) $this->db->get_var(
 			$this->db->prepare(
-				"SELECT COUNT(*) FROM {$this->table} WHERE offering_id = %d AND status = %s",
+				'SELECT COUNT(*) FROM %i WHERE offering_id = %d AND status = %s',
+				$this->table,
 				$offeringId,
 				Enrollment::STATUS_ACTIVE
 			)
@@ -55,7 +56,8 @@ class EnrollmentRepository {
 	public function countActiveForStudent( int $studentId ): int {
 		return (int) $this->db->get_var(
 			$this->db->prepare(
-				"SELECT COUNT(*) FROM {$this->table} WHERE student_id = %d AND status = %s",
+				'SELECT COUNT(*) FROM %i WHERE student_id = %d AND status = %s',
+				$this->table,
 				$studentId,
 				Enrollment::STATUS_ACTIVE
 			)
@@ -68,7 +70,8 @@ class EnrollmentRepository {
 	public function hasActiveEnrollment( int $offeringId, int $studentId ): bool {
 		$count = (int) $this->db->get_var(
 			$this->db->prepare(
-				"SELECT COUNT(*) FROM {$this->table} WHERE offering_id = %d AND student_id = %d AND status = %s",
+				'SELECT COUNT(*) FROM %i WHERE offering_id = %d AND student_id = %d AND status = %s',
+				$this->table,
 				$offeringId,
 				$studentId,
 				Enrollment::STATUS_ACTIVE
@@ -86,7 +89,8 @@ class EnrollmentRepository {
 	public function findByStudent( int $studentId ): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE student_id = %d ORDER BY enrolled_at DESC",
+				'SELECT * FROM %i WHERE student_id = %d ORDER BY enrolled_at DESC',
+				$this->table,
 				$studentId
 			)
 		);
@@ -102,7 +106,8 @@ class EnrollmentRepository {
 	public function findByInstructor( int $instructorId ): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE instructor_id = %d ORDER BY enrolled_at DESC",
+				'SELECT * FROM %i WHERE instructor_id = %d ORDER BY enrolled_at DESC',
+				$this->table,
 				$instructorId
 			)
 		);
@@ -118,7 +123,8 @@ class EnrollmentRepository {
 	public function findAllActive(): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE status = %s ORDER BY enrolled_at DESC",
+				'SELECT * FROM %i WHERE status = %s ORDER BY enrolled_at DESC',
+				$this->table,
 				Enrollment::STATUS_ACTIVE
 			)
 		);
@@ -126,6 +132,39 @@ class EnrollmentRepository {
 		return array_map( Enrollment::fromRow( ... ), $rows ?? [] );
 	}
 
+	/**
+	 * Active enrolments whose group class bills on a scheduled mode (weekly /
+	 * monthly) — the source rows for the daily billing scan. Filtered by joining
+	 * the offering so only classes actually on a scheduled plan are returned.
+	 *
+	 * @param list<string> $modes Billing modes to include (e.g. weekly, monthly).
+	 * @return list<Enrollment>
+	 */
+	public function findActiveByBillingModes( array $modes ): array {
+		if ( [] === $modes ) {
+			return [];
+		}
+
+		$offTable     = str_replace( 'us_group_enrollments', 'us_offerings', $this->table );
+		$placeholders = implode( ', ', array_fill( 0, count( $modes ), '%s' ) );
+
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				"SELECT e.* FROM %i e
+				 JOIN %i o ON o.id = e.offering_id
+				 WHERE e.status = %s
+				   AND o.billing_mode IN ( {$placeholders} )
+				 ORDER BY e.student_id ASC, e.offering_id ASC",
+				$this->table,
+				$offTable,
+				Enrollment::STATUS_ACTIVE,
+				...$modes
+			)
+		);
+
+		return array_map( Enrollment::fromRow( ... ), $rows ?? [] );
+	}
+
 	public function setPaymentId( int $id, int $paymentId ): bool {
 		return false !== $this->db->update(
 			$this->table,

src/GroupClass/GroupAccess.php

@@ -0,0 +1,67 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\GroupClass;
+
+use Unsupervised\Schedular\Val;
+
+/**
+ * A grant of access to an invite-only group class. Registered students who have
+ * been "made available" a class hold an `invited` grant (`student_id` set);
+ * email-invited people who do not yet have an account hold a grant keyed by
+ * `email` and linked to a `us_invites` row, which is pointed at the new
+ * `student_id` once they register. A grant flips to `enrolled` when the student
+ * enrols through the normal flow.
+ */
+class GroupAccess {
+
+	public const STATUS_INVITED  = 'invited';
+	public const STATUS_ENROLLED = 'enrolled';
+	public const STATUS_REVOKED  = 'revoked';
+
+	/**
+	 * All valid grant statuses.
+	 *
+	 * @var list<string>
+	 */
+	public const VALID_STATUSES = [ self::STATUS_INVITED, self::STATUS_ENROLLED, self::STATUS_REVOKED ];
+
+	public function __construct(
+		public readonly int $offeringId,
+		public readonly ?int $studentId = null,
+		public readonly string $email = '',
+		public readonly ?int $inviteId = null,
+		public readonly string $status = self::STATUS_INVITED,
+		public readonly ?int $invitedBy = null,
+		public readonly ?int $id = null,
+	) {}
+
+	public static function fromRow( \stdClass $row ): self {
+		return new self(
+			offeringId: Val::int( $row->offering_id ),
+			studentId:  Val::intOrNull( $row->student_id ),
+			email:      Val::string( $row->email ?? '' ),
+			inviteId:   Val::intOrNull( $row->invite_id ?? null ),
+			status:     Val::string( $row->status ),
+			invitedBy:  Val::intOrNull( $row->invited_by ?? null ),
+			id:         Val::int( $row->id ),
+		);
+	}
+
+	/**
+	 * Returns a plain array representation of the grant.
+	 *
+	 * @return array<string, mixed>
+	 */
+	public function toArray(): array {
+		return [
+			'id'          => $this->id,
+			'offering_id' => $this->offeringId,
+			'student_id'  => $this->studentId,
+			'email'       => $this->email,
+			'invite_id'   => $this->inviteId,
+			'status'      => $this->status,
+			'invited_by'  => $this->invitedBy,
+		];
+	}
+}

src/GroupClass/GroupAccessRepository.php

@@ -0,0 +1,132 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\GroupClass;
+
+class GroupAccessRepository {
+
+	private string $table;
+
+	public function __construct( private \wpdb $db ) {
+		$this->table = $db->prefix . 'us_group_access';
+	}
+
+	public function insert( GroupAccess $access ): int {
+		$this->db->insert(
+			$this->table,
+			[
+				'offering_id' => $access->offeringId,
+				'student_id'  => $access->studentId,
+				'email'       => $access->email,
+				'invite_id'   => $access->inviteId,
+				'status'      => $access->status,
+				'invited_by'  => $access->invitedBy,
+				'created_at'  => current_time( 'mysql' ),
+			],
+			[ '%d', '%d', '%s', '%d', '%s', '%d', '%s' ]
+		);
+
+		return $this->db->insert_id;
+	}
+
+	/**
+	 * Whether a student holds a live (invited or enrolled) grant for an offering.
+	 */
+	public function hasGrant( int $offeringId, int $studentId ): bool {
+		$count = (int) $this->db->get_var(
+			$this->db->prepare(
+				'SELECT COUNT(*) FROM %i WHERE offering_id = %d AND student_id = %d AND status IN ( %s, %s )',
+				$this->table,
+				$offeringId,
+				$studentId,
+				GroupAccess::STATUS_INVITED,
+				GroupAccess::STATUS_ENROLLED
+			)
+		);
+
+		return $count > 0;
+	}
+
+	/**
+	 * The offering ids a student holds a live grant for — the invite-only classes
+	 * to fold into their catalogue view.
+	 *
+	 * @return list<int>
+	 */
+	public function findGrantedOfferingIds( int $studentId ): array {
+		$rows = $this->db->get_col(
+			$this->db->prepare(
+				'SELECT DISTINCT offering_id FROM %i WHERE student_id = %d AND status IN ( %s, %s )',
+				$this->table,
+				$studentId,
+				GroupAccess::STATUS_INVITED,
+				GroupAccess::STATUS_ENROLLED
+			)
+		);
+
+		return array_values( array_map( \Unsupervised\Schedular\Val::int( ... ), $rows ) );
+	}
+
+	/**
+	 * All grants for an offering, newest first.
+	 *
+	 * @return list<GroupAccess>
+	 */
+	public function findByOffering( int $offeringId ): array {
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT * FROM %i WHERE offering_id = %d ORDER BY id DESC',
+				$this->table,
+				$offeringId
+			)
+		);
+
+		return array_map( GroupAccess::fromRow( ... ), $rows ?? [] );
+	}
+
+	/**
+	 * Point email-invite grants for an address at the account created when the
+	 * invitation was accepted, so the granted class unlocks for the new student.
+	 * Only grants still awaiting an account (`student_id` NULL) are linked.
+	 */
+	public function linkStudentByEmail( string $email, int $studentId ): bool {
+		if ( '' === $email ) {
+			return false;
+		}
+
+		$sql = $this->db->prepare(
+			'UPDATE %i SET student_id = %d WHERE email = %s AND student_id IS NULL',
+			$this->table,
+			$studentId,
+			$email
+		);
+
+		return null !== $sql && false !== $this->db->query( $sql );
+	}
+
+	/**
+	 * Flip a student's live grant for an offering to enrolled.
+	 */
+	public function markEnrolled( int $offeringId, int $studentId ): bool {
+		return false !== $this->db->update(
+			$this->table,
+			[ 'status' => GroupAccess::STATUS_ENROLLED ],
+			[
+				'offering_id' => $offeringId,
+				'student_id'  => $studentId,
+			],
+			[ '%s' ],
+			[ '%d', '%d' ]
+		);
+	}
+
+	public function revoke( int $id ): bool {
+		return false !== $this->db->update(
+			$this->table,
+			[ 'status' => GroupAccess::STATUS_REVOKED ],
+			[ 'id' => $id ],
+			[ '%s' ],
+			[ '%d' ]
+		);
+	}
+}

src/GroupClass/GroupClassController.php

@@ -3,35 +3,513 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\GroupClass;
 
+use Unsupervised\Schedular\Auth\Invite;
+use Unsupervised\Schedular\Auth\InviteRepository;
+use Unsupervised\Schedular\Auth\RegistrationController;
+use Unsupervised\Schedular\Auth\RegistrationMailer;
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Auth\UserName;
+use Unsupervised\Schedular\Offering\Offering;
 use Unsupervised\Schedular\Offering\OfferingRepository;
+use Unsupervised\Schedular\Payment\Payment;
+use Unsupervised\Schedular\Payment\PaymentRepository;
+use Unsupervised\Schedular\Payment\PaymentService;
+use Unsupervised\Schedular\Val;
 
 class GroupClassController {
 
 	public function __construct(
 		private EnrollmentRepository $enrollments,
 		private OfferingRepository $offerings,
+		private PaymentRepository $payments,
+		private GroupAccessRepository $access,
+		private PaymentService $paymentService,
+		private InviteRepository $invites,
+		private RegistrationMailer $mailer,
 	) {}
 
+	/**
+	 * Studio-admin overview: every group class across instructors as a summary —
+	 * who teaches it, when it meets, and how full it is — rather than a flat list
+	 * of individual student enrolments. Selecting a class (`?class_id=<id>`) opens
+	 * the same per-class details page instructors use, so a studio admin (including
+	 * an owner-operator who also teaches) can view any class's roster and manage
+	 * invite-only membership from here.
+	 */
 	public function renderPage(): void {
 		if ( ! current_user_can( RoleManager::CAP_VIEW_ALL_LESSONS ) ) {
 			wp_die( esc_html__( 'You do not have permission to view group classes.', 'unsupervised-schedular' ) );
 		}
 
-		$rows = array_map(
-			function ( Enrollment $enrollment ): array {
-				$offering = $this->offerings->findById( $enrollment->offeringId );
-				$student  = get_userdata( $enrollment->studentId );
+		$notice = '';
+		if ( isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_group_action' ) ) {
+			$notice = $this->handleFormAction( get_current_user_id() );
+		}
 
+		$offerings = $this->offerings->findAll( 0, Offering::KIND_GROUP_CLASS );
+		$baseUrl   = admin_url( 'admin.php?page=us-group-classes' );
+
+		// View-state query param only (which class to drill into) — nothing is
+		// mutated from it, so no nonce applies.
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
+		$classId = absint( Val::int( $_GET['class_id'] ?? 0 ) );
+		$current = null;
+		foreach ( $offerings as $offering ) {
+			if ( $offering->id === $classId ) {
+				$current = $offering;
+				break;
+			}
+		}
+
+		if ( null !== $current ) {
+			// Enrolments are looked up by the class's own instructor; classDetail
+			// filters them down to this offering.
+			$class    = $this->classDetail( $current, $this->enrollments->findByInstructor( $current->instructorId ) );
+			$students = $this->studentOptions();
+
+			include USC_PLUGIN_DIR . 'templates/admin/my-group-class-detail.php';
+
+			return;
+		}
+
+		$rows = array_map(
+			function ( Offering $offering ): array {
 				return [
-					'student'  => $student ? $student->display_name : (string) $enrollment->studentId,
-					'offering' => $offering ? $offering->title : (string) $enrollment->offeringId,
-					'status'   => $enrollment->status,
+					'id'          => $offering->id,
+					'title'       => $offering->title,
+					'instructor'  => $this->instructorName( $offering ),
+					'when'        => $this->whenLabel( $offering ),
+					'capacity'    => $offering->capacity,
+					'enrolled'    => $this->enrollments->countActiveForOffering( (int) $offering->id ),
+					'invite_only' => $offering->isInviteOnly(),
 				];
 			},
-			$this->enrollments->findAllActive()
+			$offerings
 		);
 
 		include USC_PLUGIN_DIR . 'templates/admin/group-classes.php';
 	}
+
+	/**
+	 * Instructor view. By default a summary of the instructor's own group classes
+	 * — each with when it meets and how many are enrolled — rather than a dump of
+	 * every roster. A `class_id` query param drills into one class to show its
+	 * roster of enrolled students and, for invite-only classes, the controls to
+	 * add, grant access to, or email-invite students.
+	 */
+	public function renderInstructorPage(): void {
+		if ( ! current_user_can( RoleManager::CAP_VIEW_LESSONS ) ) {
+			wp_die( esc_html__( 'You do not have permission to view group classes.', 'unsupervised-schedular' ) );
+		}
+
+		$instructorId = get_current_user_id();
+
+		$notice = '';
+		if ( isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_group_action' ) ) {
+			$notice = $this->handleFormAction( $instructorId );
+		}
+
+		$offerings   = $this->offerings->findAll( $instructorId, Offering::KIND_GROUP_CLASS );
+		$enrollments = $this->enrollments->findByInstructor( $instructorId );
+
+		// View-state query param only (which class to drill into) — nothing is
+		// mutated from it, so no nonce applies.
+		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
+		$classId = absint( Val::int( $_GET['class_id'] ?? 0 ) );
+		$current = null;
+		foreach ( $offerings as $offering ) {
+			if ( $offering->id === $classId ) {
+				$current = $offering;
+				break;
+			}
+		}
+
+		if ( null !== $current ) {
+			$baseUrl  = admin_url( 'admin.php?page=us-my-group-classes' );
+			$class    = $this->classDetail( $current, $enrollments );
+			$students = $this->studentOptions();
+
+			include USC_PLUGIN_DIR . 'templates/admin/my-group-class-detail.php';
+
+			return;
+		}
+
+		$classes = array_map(
+			fn( Offering $offering ): array => $this->classSummary( $offering, $enrollments ),
+			$offerings
+		);
+
+		$baseUrl = admin_url( 'admin.php?page=us-my-group-classes' );
+
+		include USC_PLUGIN_DIR . 'templates/admin/my-group-classes.php';
+	}
+
+	/**
+	 * Summary row for one class in the instructor overview: its identity, when it
+	 * meets, and how many active enrolments it holds against capacity.
+	 *
+	 * @param list<Enrollment> $enrollments
+	 * @return array{id: int|null, title: string, when: string, capacity: int|null, enrolled: int, invite_only: bool}
+	 */
+	private function classSummary( Offering $offering, array $enrollments ): array {
+		$enrolled = 0;
+		foreach ( $enrollments as $enrollment ) {
+			if ( $enrollment->offeringId === $offering->id && Enrollment::STATUS_ACTIVE === $enrollment->status ) {
+				++$enrolled;
+			}
+		}
+
+		return [
+			'id'          => $offering->id,
+			'title'       => $offering->title,
+			'when'        => $this->whenLabel( $offering ),
+			'capacity'    => $offering->capacity,
+			'enrolled'    => $enrolled,
+			'invite_only' => $offering->isInviteOnly(),
+		];
+	}
+
+	/**
+	 * Full details for one class: the summary fields, the class's own settings
+	 * (instructor, price, duration, description, schedule, active state), the
+	 * roster of enrolled students (with enrolment and payment status), and — for
+	 * invite-only classes — the list of people invited but not yet enrolled.
+	 *
+	 * @param list<Enrollment> $enrollments
+	 * @return array{id: int|null, title: string, when: string, capacity: int|null, enrolled: int, invite_only: bool, instructor: string, price: float, currency: string, duration: int|null, description: string|null, schedule_note: string|null, deadline: string, enrollment_open: bool, active: bool, roster: list<array{student: string, status: string, payment: string|null}>, invited: list<array{who: string, kind: string}>}
+	 */
+	private function classDetail( Offering $offering, array $enrollments ): array {
+		$roster = [];
+		foreach ( $enrollments as $enrollment ) {
+			if ( $enrollment->offeringId !== $offering->id ) {
+				continue;
+			}
+
+			$student = get_userdata( $enrollment->studentId );
+			$payment = null !== $enrollment->paymentId ? $this->payments->findById( $enrollment->paymentId ) : null;
+
+			$roster[] = [
+				'student' => $student ? $student->display_name : (string) $enrollment->studentId,
+				'status'  => $enrollment->status,
+				'payment' => $payment?->status,
+			];
+		}
+
+		$deadline = $offering->effectiveEnrollmentDeadline();
+
+		return $this->classSummary( $offering, $enrollments ) + [
+			'instructor'      => $this->instructorName( $offering ),
+			'price'           => $offering->price,
+			'currency'        => $offering->currency,
+			'duration'        => $offering->durationMinutes,
+			'description'     => $offering->description,
+			'schedule_note'   => $offering->scheduleNote,
+			'deadline'        => null !== $deadline ? (string) mysql2date( 'M j, Y', $deadline ) : '',
+			'enrollment_open' => $offering->isEnrollmentOpen( Val::string( current_time( 'Y-m-d' ) ) ),
+			'active'          => $offering->isActive,
+			'roster'          => $roster,
+			'invited'         => $offering->isInviteOnly() ? $this->pendingInvites( (int) $offering->id ) : [],
+		];
+	}
+
+	/**
+	 * The teaching instructor's display name — their real name or nickname, never
+	 * the login. Falls back to the numeric id when the account is gone. See
+	 * {@see UserName::format()}.
+	 */
+	private function instructorName( Offering $offering ): string {
+		$user = get_userdata( $offering->instructorId );
+
+		return UserName::format( $user instanceof \WP_User ? $user : null, $offering->instructorId );
+	}
+
+	/**
+	 * Human-readable "when" label for a class: the class date (or weekly date
+	 * range) and, when set, the start time. Empty when the class has no date.
+	 */
+	private function whenLabel( Offering $offering ): string {
+		if ( null === $offering->termStart ) {
+			return '';
+		}
+
+		$label = null === $offering->termEnd || $offering->termEnd === $offering->termStart
+			? (string) mysql2date( 'M j, Y', $offering->termStart )
+			: (string) mysql2date( 'M j, Y', $offering->termStart ) . ' – ' . (string) mysql2date( 'M j, Y', $offering->termEnd );
+
+		if ( null !== $offering->classTime ) {
+			$label .= ' · ' . (string) mysql2date( 'g:i a', $offering->termStart . ' ' . $offering->classTime );
+		}
+
+		return $label;
+	}
+
+	/**
+	 * Pending (not-yet-enrolled) access grants for an invite-only class, shown so
+	 * the instructor can see who has been invited but has not enrolled yet.
+	 *
+	 * @return list<array{who: string, kind: string}>
+	 */
+	private function pendingInvites( int $offeringId ): array {
+		$out = [];
+		foreach ( $this->access->findByOffering( $offeringId ) as $grant ) {
+			if ( GroupAccess::STATUS_INVITED !== $grant->status ) {
+				continue;
+			}
+
+			if ( null !== $grant->studentId ) {
+				$user  = get_userdata( $grant->studentId );
+				$out[] = [
+					'who'  => $user ? $user->display_name : (string) $grant->studentId,
+					'kind' => __( 'Granted', 'unsupervised-schedular' ),
+				];
+			} else {
+				$out[] = [
+					'who'  => $grant->email,
+					'kind' => __( 'Email invite', 'unsupervised-schedular' ),
+				];
+			}
+		}
+
+		return $out;
+	}
+
+	/**
+	 * Handle a posted management action, returning a status notice for display.
+	 * The action is scoped to a group class the current instructor owns, unless
+	 * the caller is a studio admin (`view_all_lessons`) — who may manage any
+	 * instructor's class, since the studio-admin Group Classes page reaches the
+	 * same controls for every class.
+	 */
+	private function handleFormAction( int $instructorId ): string {
+		// Nonce is verified by the caller before this method runs.
+		// phpcs:disable WordPress.Security.NonceVerification.Missing
+		$action     = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ?? '' ) ) );
+		$offeringId = absint( Val::int( $_POST['offering_id'] ?? 0 ) );
+		$offering   = $offeringId > 0 ? $this->offerings->findById( $offeringId ) : null;
+
+		$ownsOrManagesAll = null !== $offering
+			&& ( $offering->instructorId === $instructorId || current_user_can( RoleManager::CAP_VIEW_ALL_LESSONS ) );
+
+		if ( null === $offering || ! $ownsOrManagesAll || Offering::KIND_GROUP_CLASS !== $offering->kind ) {
+			return esc_html__( 'That group class was not found.', 'unsupervised-schedular' );
+		}
+
+		if ( 'add_direct' === $action ) {
+			return $this->addDirect( $offering, $this->postedStudentIds() );
+		}
+
+		if ( 'grant_access' === $action ) {
+			return $this->grantAccess( $offering, $this->postedStudentIds() );
+		}
+
+		if ( 'invite_email' === $action ) {
+			$email = sanitize_email( Val::string( wp_unslash( $_POST['email'] ?? '' ) ) );
+
+			return $this->inviteEmail( $offering, $email );
+		}
+		// phpcs:enable WordPress.Security.NonceVerification.Missing
+
+		return '';
+	}
+
+	/**
+	 * Directly enrol registered students, each with a pending payment at the
+	 * class price (comp students are settled immediately by the payment service).
+	 *
+	 * This is the instructor's manual enrolment path and deliberately bypasses the
+	 * enrolment deadline and capacity, so a student can be added as a late
+	 * enrolment after the class has closed to self-enrolment.
+	 *
+	 * @param list<int> $studentIds
+	 */
+	private function addDirect( Offering $offering, array $studentIds ): string {
+		$added = 0;
+		foreach ( $studentIds as $studentId ) {
+			if ( $this->enrollments->hasActiveEnrollment( (int) $offering->id, $studentId ) ) {
+				continue;
+			}
+
+			$enrollmentId = $this->enrollments->insert(
+				new Enrollment(
+					offeringId:   (int) $offering->id,
+					studentId:    $studentId,
+					instructorId: $offering->instructorId,
+				)
+			);
+
+			if ( $offering->price > 0.0 ) {
+				$payment = $this->paymentService->createForRegistration(
+					Payment::REG_ENROLLMENT,
+					$enrollmentId,
+					$studentId,
+					$offering->instructorId,
+					$offering->price,
+					$offering->currency,
+					$offering->etransferEmail
+				);
+
+				if ( null !== $payment && null !== $payment->id ) {
+					$this->enrollments->setPaymentId( $enrollmentId, $payment->id );
+				}
+			}
+
+			$this->access->markEnrolled( (int) $offering->id, $studentId );
+			++$added;
+		}
+
+		/* translators: %d: number of students added. */
+		return sprintf( esc_html__( '%d student(s) added to the class.', 'unsupervised-schedular' ), $added );
+	}
+
+	/**
+	 * Grant registered students access to the class so it appears in their list
+	 * for self-enrolment, notifying each by email.
+	 *
+	 * @param list<int> $studentIds
+	 */
+	private function grantAccess( Offering $offering, array $studentIds ): string {
+		$granted = 0;
+		foreach ( $studentIds as $studentId ) {
+			if (
+				$this->enrollments->hasActiveEnrollment( (int) $offering->id, $studentId )
+				|| $this->access->hasGrant( (int) $offering->id, $studentId )
+			) {
+				continue;
+			}
+
+			$this->access->insert(
+				new GroupAccess(
+					offeringId: (int) $offering->id,
+					studentId:  $studentId,
+					status:     GroupAccess::STATUS_INVITED,
+					invitedBy:  get_current_user_id(),
+				)
+			);
+
+			$user = get_userdata( $studentId );
+			if ( $user instanceof \WP_User ) {
+				$this->mailer->sendClassAccessGranted( $user, $offering->title );
+			}
+
+			++$granted;
+		}
+
+		/* translators: %d: number of students granted access. */
+		return sprintf( esc_html__( '%d student(s) granted access.', 'unsupervised-schedular' ), $granted );
+	}
+
+	/**
+	 * Invite someone by email. A registered address is treated as a grant; an
+	 * unknown address gets a tokenised registration invite tied to the class,
+	 * reusing any pending invite already outstanding for that address (in which
+	 * case no new link is sent).
+	 */
+	private function inviteEmail( Offering $offering, string $email ): string {
+		if ( ! is_email( $email ) ) {
+			return esc_html__( 'Enter a valid email address.', 'unsupervised-schedular' );
+		}
+
+		$existingUserId = email_exists( $email );
+		if ( false !== $existingUserId ) {
+			return $this->grantAccess( $offering, [ (int) $existingUserId ] );
+		}
+
+		// Reuse an outstanding invite rather than mailing a second link; still
+		// attach a class grant so enrolment unlocks once they register.
+		$pending = $this->invites->findPendingByEmail( $email );
+		if ( null !== $pending ) {
+			$this->access->insert(
+				new GroupAccess(
+					offeringId: (int) $offering->id,
+					email:      $email,
+					inviteId:   $pending->id,
+					status:     GroupAccess::STATUS_INVITED,
+					invitedBy:  get_current_user_id(),
+				)
+			);
+
+			return esc_html__( 'This person already has a pending invitation; the class was added to it. No new link was sent.', 'unsupervised-schedular' );
+		}
+
+		$rawToken = wp_generate_password( 32, false );
+		$inviteId = $this->invites->insert(
+			new Invite(
+				email:      $email,
+				token:      Invite::hashToken( $rawToken ),
+				invitedBy:  get_current_user_id(),
+				offeringId: (int) $offering->id,
+			)
+		);
+
+		if ( $inviteId <= 0 ) {
+			return esc_html__( 'Could not create the invite. Deactivate and reactivate the plugin to update the database, then try again.', 'unsupervised-schedular' );
+		}
+
+		$this->access->insert(
+			new GroupAccess(
+				offeringId: (int) $offering->id,
+				email:      $email,
+				inviteId:   $inviteId,
+				status:     GroupAccess::STATUS_INVITED,
+				invitedBy:  get_current_user_id(),
+			)
+		);
+
+		$this->mailer->sendClassInvite( $email, $this->registrationLink( $rawToken ), $offering->title );
+
+		return esc_html__( 'Invitation sent.', 'unsupervised-schedular' );
+	}
+
+	/**
+	 * Registered students to offer in the add/grant selects, by display name.
+	 *
+	 * @return list<array{id: int, name: string}>
+	 */
+	private function studentOptions(): array {
+		$users = array_filter(
+			get_users(
+				[
+					'role'    => RoleManager::STUDENT,
+					'orderby' => 'display_name',
+					'order'   => 'ASC',
+				]
+			),
+			static fn( mixed $u ): bool => $u instanceof \WP_User
+		);
+
+		return array_values(
+			array_map(
+				static fn( \WP_User $u ): array => [
+					'id'   => (int) $u->ID,
+					'name' => '' !== (string) $u->display_name ? (string) $u->display_name : (string) $u->user_email,
+				],
+				$users
+			)
+		);
+	}
+
+	/**
+	 * The de-duplicated positive student ids posted from a multi-select.
+	 *
+	 * @return list<int>
+	 */
+	private function postedStudentIds(): array {
+		// Nonce is verified by the caller before this method runs.
+		// phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- each element is coerced to a positive int below; slashes cannot survive integer coercion.
+		$raw = (array) ( $_POST['student_ids'] ?? [] );
+		$ids = array_filter( array_map( static fn( mixed $v ): int => absint( Val::int( $v ) ), $raw ) );
+
+		return array_values( array_unique( $ids ) );
+	}
+
+	/**
+	 * Build the registration URL for a raw invite token, mirroring the invites
+	 * admin page so class invites land on the same registration page.
+	 */
+	private function registrationLink( string $rawToken ): string {
+		$pageId   = Val::int( get_option( RegistrationController::OPTION_PAGE, 0 ) );
+		$linkBase = $pageId > 0 ? (string) get_permalink( $pageId ) : '';
+
+		return add_query_arg( 'us_invite', rawurlencode( $rawToken ), '' !== $linkBase ? $linkBase : home_url( '/' ) );
+	}
 }

src/GroupClass/GroupClassPage.php

@@ -4,20 +4,28 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\GroupClass;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class GroupClassPage {
 
 	/**
 	 * Renders the group-class enrolment shortcode output.
 	 *
-	 * @param array<string, string> $atts Shortcode attributes (unused — reserved for future options).
+	 * Supported attributes: `offering` (shortcode) / `offeringId` (block) — an
+	 * offering id that restricts the page to a single class, so the shortcode
+	 * can be embedded on a page dedicated to that class. 0 or absent shows the
+	 * full browsable catalog.
+	 *
+	 * @param array<int|string, mixed> $atts Shortcode or block attributes.
 	 */
-	public function render( array $atts ): string { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.Found
+	public function render( array $atts ): string {
 		if ( ! is_user_logged_in() ) {
+			$permalink = get_permalink();
+
 			return sprintf(
 				'<p>%s <a href="%s">%s</a>.</p>',
 				esc_html__( 'Please', 'unsupervised-schedular' ),
-				esc_url( wp_login_url( get_permalink() ) ),
+				esc_url( wp_login_url( false === $permalink ? '' : $permalink ) ),
 				esc_html__( 'log in to enrol in a class', 'unsupervised-schedular' )
 			);
 		}
@@ -29,6 +37,8 @@ class GroupClassPage {
 		wp_enqueue_style( 'us-scheduler' );
 		wp_enqueue_script( 'us-scheduler-group' );
 
+		$offeringId = absint( Val::int( $atts['offering'] ?? $atts['offeringId'] ?? 0 ) );
+
 		ob_start();
 		include USC_PLUGIN_DIR . 'templates/frontend/group-classes-page.php';
 		return (string) ob_get_clean();

src/Installer.php

@@ -4,18 +4,36 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Availability\AvailabilityRepository;
+use Unsupervised\Schedular\Payment\ScheduledBillingRunner;
 
 class Installer {
 
 	public function run(): void {
 		$this->createTables();
+		$this->migrateData();
 		( new RoleManager() )->createRoles();
+		$this->scheduleBilling();
 		flush_rewrite_rules();
 		update_option( 'us_schedular_version', USC_VERSION );
 	}
 
+	/**
+	 * Ensure the daily scheduled-billing scan is registered with WP-Cron. Runs on
+	 * activation and on every version-bump re-install, so an existing site that
+	 * predates the feature picks the event up on its next deploy.
+	 */
+	private function scheduleBilling(): void {
+		if ( false === wp_next_scheduled( ScheduledBillingRunner::HOOK ) ) {
+			wp_schedule_event( time(), 'daily', ScheduledBillingRunner::HOOK );
+		}
+	}
+
 	private function createTables(): void {
 		global $wpdb;
+		if ( ! $wpdb instanceof \wpdb ) {
+			return;
+		}
 		$charset = $wpdb->get_charset_collate();
 
 		require_once ABSPATH . 'wp-admin/includes/upgrade.php';
@@ -24,4 +42,13 @@ class Installer {
 			dbDelta( $sql );
 		}
 	}
+
+	private function migrateData(): void {
+		global $wpdb;
+		if ( ! $wpdb instanceof \wpdb ) {
+			return;
+		}
+
+		( new AvailabilityRepository( $wpdb ) )->splitOversizedWindows();
+	}
 }

src/Offering/ClassSlotReconciler.php

@@ -0,0 +1,57 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Offering;
+
+use Unsupervised\Schedular\Availability\AvailabilityRepository;
+
+/**
+ * Keeps an instructor's open availability out of the way of the group classes
+ * they teach. When a group class is scheduled (an assigned instructor plus a
+ * date, time, and duration), each session occupies the instructor: any open
+ * private-booking slot that overlaps a session is removed so students cannot
+ * book the instructor at the class time, and any already-booked slot that
+ * overlaps is reported as a conflict for the studio to resolve by hand — a
+ * booked lesson is never silently deleted.
+ */
+class ClassSlotReconciler {
+
+	public function __construct( private AvailabilityRepository $availability ) {}
+
+	/**
+	 * Reconcile the assigned instructor's availability with the class schedule.
+	 *
+	 * @return array{removed: int, conflicts: list<string>} The number of open
+	 *         slots cleared, and the start datetime (`Y-m-d H:i:s`) of each booked
+	 *         slot that still clashes with a session.
+	 */
+	public function reconcile( Offering $offering ): array {
+		if ( Offering::KIND_GROUP_CLASS !== $offering->kind || $offering->instructorId <= 0 ) {
+			return [
+				'removed'   => 0,
+				'conflicts' => [],
+			];
+		}
+
+		$removed   = 0;
+		$conflicts = [];
+
+		foreach ( $offering->sessionWindows() as $window ) {
+			foreach ( $this->availability->findOverlapping( $offering->instructorId, $window['start'], $window['end'] ) as $slot ) {
+				if ( $slot->isBooked ) {
+					$conflicts[] = $slot->startDt;
+					continue;
+				}
+
+				if ( null !== $slot->id && $this->availability->delete( $slot->id ) ) {
+					++$removed;
+				}
+			}
+		}
+
+		return [
+			'removed'   => $removed,
+			'conflicts' => $conflicts,
+		];
+	}
+}

src/Offering/Offering.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Offering;
 
+use Unsupervised\Schedular\Val;
+
 class Offering {
 
 	public const KIND_PRIVATE_LESSON = 'private_lesson';
@@ -18,12 +20,48 @@ class Offering {
 	public const BILLING_ONE_TIME  = 'one_time';
 	public const BILLING_FULL_TERM = 'full_term';
 
+	/** Billed 24 hours before each lesson, on a recurring schedule (see scheduled-billing.md). */
+	public const BILLING_WEEKLY = 'weekly';
+
+	/** Billed on the first of each month for every lesson that falls in the month. */
+	public const BILLING_MONTHLY = 'monthly';
+
 	/**
 	 * All valid billing modes.
 	 *
 	 * @var list<string>
 	 */
-	public const VALID_BILLING_MODES = [ self::BILLING_ONE_TIME, self::BILLING_FULL_TERM ];
+	public const VALID_BILLING_MODES = [ self::BILLING_ONE_TIME, self::BILLING_FULL_TERM, self::BILLING_WEEKLY, self::BILLING_MONTHLY ];
+
+	/**
+	 * Billing modes whose payment is generated later by the daily billing scan
+	 * rather than taken at registration.
+	 *
+	 * @var list<string>
+	 */
+	public const SCHEDULED_BILLING_MODES = [ self::BILLING_WEEKLY, self::BILLING_MONTHLY ];
+
+	/** Listed in the public catalogue; anyone with `book_lesson` may enrol. */
+	public const ACCESS_PUBLIC = 'public';
+
+	/** Hidden from the catalogue; only invited/added students may enrol (group classes). */
+	public const ACCESS_INVITE_ONLY = 'invite_only';
+
+	/**
+	 * All valid access modes.
+	 *
+	 * @var list<string>
+	 */
+	public const VALID_ACCESS_MODES = [ self::ACCESS_PUBLIC, self::ACCESS_INVITE_ONLY ];
+
+	/** Maximum length of the title, matching the `title` VARCHAR(191) column. */
+	public const MAX_TITLE_LENGTH = 191;
+
+	/** Maximum length of the schedule note, matching the `schedule_note` VARCHAR(191) column. */
+	public const MAX_SCHEDULE_NOTE_LENGTH = 191;
+
+	/** Maximum length of the e-transfer email, matching the `etransfer_email` VARCHAR(191) column. */
+	public const MAX_ETRANSFER_EMAIL_LENGTH = 191;
 
 	public function __construct(
 		public readonly int $instructorId,
@@ -38,30 +76,174 @@ class Offering {
 		public readonly ?int $capacity = null,
 		public readonly ?string $termStart = null,
 		public readonly ?string $termEnd = null,
+		public readonly ?string $classTime = null,
+		public readonly ?string $enrollmentDeadline = null,
+		public readonly ?string $withdrawalDeadline = null,
 		public readonly ?string $scheduleNote = null,
 		public readonly ?string $etransferEmail = null,
+		public readonly ?int $cancellationCutoffHours = null,
+		public readonly string $accessMode = self::ACCESS_PUBLIC,
 		public readonly bool $isActive = true,
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	/**
+	 * Whether the offering is hidden from the public catalogue and reachable
+	 * only by invited or directly-added students.
+	 */
+	public function isInviteOnly(): bool {
+		return self::ACCESS_INVITE_ONLY === $this->accessMode;
+	}
+
+	/**
+	 * Whether this offering's payment is deferred to the daily billing scan
+	 * (weekly / monthly) instead of being taken at registration.
+	 */
+	public function isScheduledBilling(): bool {
+		return in_array( $this->billingMode, self::SCHEDULED_BILLING_MODES, true );
+	}
+
+	/**
+	 * The last day on which a student may enrol in this group class. Defaults to
+	 * the first day of the class (`term_start`) when the instructor has not set an
+	 * explicit deadline; null only when the class has no dates at all.
+	 */
+	public function effectiveEnrollmentDeadline(): ?string {
+		return $this->enrollmentDeadline ?? $this->termStart;
+	}
+
+	/**
+	 * Whether enrolment is still open on `$today` (a `Y-m-d` date). Enrolment stays
+	 * open through the end of the deadline day, so the first class is still
+	 * enrollable under the default deadline. A class with no deadline at all (no
+	 * dates configured) is always open.
+	 */
+	public function isEnrollmentOpen( string $today ): bool {
+		$deadline = $this->effectiveEnrollmentDeadline();
+
+		return null === $deadline || $today <= $deadline;
+	}
+
+	/**
+	 * Whether a student may still withdraw themselves from this group class on
+	 * `$today` (a `Y-m-d` date). Withdrawal stays open through the end of the
+	 * deadline day. Unlike the enrolment deadline there is no implicit default: a
+	 * class with no withdrawal deadline set stays open to withdrawal for its whole
+	 * life, so the instructor must set a date to lock students in. A withdrawal
+	 * made while open never issues an account credit — it only frees the seat and
+	 * voids any still-pending payment.
+	 */
+	public function isWithdrawalOpen( string $today ): bool {
+		return null === $this->withdrawalDeadline || $today <= $this->withdrawalDeadline;
+	}
+
+	/**
+	 * Normalise a submitted term date to canonical `Y-m-d`, or null when it is
+	 * not a real calendar date. Round-trips through DateTimeImmutable so
+	 * strings PHP would silently coerce (e.g. `2026-02-30`) are rejected.
+	 */
+	public static function normalizeDate( string $value ): ?string {
+		$date = \DateTimeImmutable::createFromFormat( '!Y-m-d', $value );
+
+		return false !== $date && $date->format( 'Y-m-d' ) === $value ? $date->format( 'Y-m-d' ) : null;
+	}
+
+	/**
+	 * Last class date of a weekly term: the start date plus `$occurrences - 1`
+	 * weeks. A one-off class (one occurrence) ends the day it starts.
+	 */
+	public static function weeklyTermEnd( string $termStart, int $occurrences ): string {
+		$weeks = max( 1, $occurrences ) - 1;
+
+		return ( new \DateTimeImmutable( $termStart ) )->modify( '+' . ( 7 * $weeks ) . ' days' )->format( 'Y-m-d' );
+	}
+
+	/**
+	 * Normalise a submitted time-of-day to canonical `H:i:s`, or null when it is
+	 * not a real time. Accepts the HTML `time` form (`H:i`, optionally with
+	 * seconds); anything else is rejected so garbage never reaches the TIME column.
+	 */
+	public static function normalizeTime( string $value ): ?string {
+		foreach ( [ 'H:i:s', 'H:i' ] as $format ) {
+			$time = \DateTimeImmutable::createFromFormat( '!' . $format, $value );
+			if ( false !== $time && $time->format( $format ) === $value ) {
+				return $time->format( 'H:i:s' );
+			}
+		}
+
+		return null;
+	}
+
+	/**
+	 * The concrete start/end datetimes of every session of this group class,
+	 * derived from the class date(s), the class time, and the duration. A weekly
+	 * class yields one window per week from `term_start` through `term_end`; a
+	 * one-off class yields a single window. Returns an empty list unless the
+	 * schedule is fully specified (date, time, and a positive duration), so it can
+	 * never fabricate a session window from partial data.
+	 *
+	 * @return list<array{start: string, end: string}>
+	 */
+	public function sessionWindows(): array {
+		if (
+			null === $this->termStart
+			|| null === $this->classTime
+			|| null === $this->durationMinutes
+			|| $this->durationMinutes <= 0
+		) {
+			return [];
+		}
+
+		$first = \DateTimeImmutable::createFromFormat( '!Y-m-d H:i:s', $this->termStart . ' ' . $this->classTime );
+		if ( false === $first ) {
+			return [];
+		}
+
+		$lastDay = null !== $this->termEnd ? $this->termEnd : $this->termStart;
+		$step    = new \DateInterval( 'PT' . $this->durationMinutes . 'M' );
+
+		$windows   = [];
+		$cursor    = $first;
+		$cursorDay = $cursor->format( 'Y-m-d' );
+
+		// Cap the walk at ten years of weeks so a term_end before term_start (or a
+		// bad value) can never spin into an unbounded loop.
+		for ( $i = 0; $i < 520 && $cursorDay <= $lastDay; $i++ ) {
+			$windows[] = [
+				'start' => $cursor->format( 'Y-m-d H:i:s' ),
+				'end'   => $cursor->add( $step )->format( 'Y-m-d H:i:s' ),
+			];
+
+			$cursor    = $cursor->modify( '+7 days' );
+			$cursorDay = $cursor->format( 'Y-m-d' );
+		}
+
+		return $windows;
+	}
+
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			instructorId:    (int) $row->instructor_id,
-			kind:            $row->kind,
-			title:           $row->title,
-			price:           (float) $row->price,
-			currency:        $row->currency,
-			billingMode:     $row->billing_mode,
-			description:     $row->description,
-			durationMinutes: null !== $row->duration_minutes ? (int) $row->duration_minutes : null,
-			allowWeekly:     (bool) $row->allow_weekly,
-			capacity:        null !== $row->capacity ? (int) $row->capacity : null,
-			termStart:       $row->term_start,
-			termEnd:         $row->term_end,
-			scheduleNote:    $row->schedule_note,
-			etransferEmail:  $row->etransfer_email,
-			isActive:        (bool) $row->is_active,
-			id:              (int) $row->id,
+			instructorId:    Val::int( $row->instructor_id ),
+			kind:            Val::string( $row->kind ),
+			title:           Val::string( $row->title ),
+			price:           Val::float( $row->price ),
+			currency:        Val::string( $row->currency ),
+			billingMode:     Val::string( $row->billing_mode ),
+			description:     Val::stringOrNull( $row->description ),
+			durationMinutes: Val::intOrNull( $row->duration_minutes ),
+			allowWeekly:     Val::bool( $row->allow_weekly ),
+			capacity:        Val::intOrNull( $row->capacity ),
+			termStart:       Val::stringOrNull( $row->term_start ),
+			termEnd:         Val::stringOrNull( $row->term_end ),
+			classTime:       Val::stringOrNull( $row->class_time ?? null ),
+			enrollmentDeadline: Val::stringOrNull( $row->enrollment_deadline ?? null ),
+			withdrawalDeadline: Val::stringOrNull( $row->withdrawal_deadline ?? null ),
+			scheduleNote:    Val::stringOrNull( $row->schedule_note ),
+			etransferEmail:  Val::stringOrNull( $row->etransfer_email ),
+			cancellationCutoffHours: Val::intOrNull( $row->cancellation_cutoff_hours ),
+			accessMode:      '' !== Val::string( $row->access_mode ?? '' ) ? Val::string( $row->access_mode ) : self::ACCESS_PUBLIC,
+			isActive:        Val::bool( $row->is_active ),
+			id:              Val::int( $row->id ),
 		);
 	}
 
@@ -76,21 +258,26 @@ class Offering {
 	 */
 	public function toArray( bool $includeEtransferEmail = true ): array {
 		$out = [
-			'id'               => $this->id,
-			'instructor_id'    => $this->instructorId,
-			'kind'             => $this->kind,
-			'title'            => $this->title,
-			'description'      => $this->description,
-			'duration_minutes' => $this->durationMinutes,
-			'price'            => $this->price,
-			'currency'         => $this->currency,
-			'billing_mode'     => $this->billingMode,
-			'allow_weekly'     => $this->allowWeekly,
-			'capacity'         => $this->capacity,
-			'term_start'       => $this->termStart,
-			'term_end'         => $this->termEnd,
-			'schedule_note'    => $this->scheduleNote,
-			'is_active'        => $this->isActive,
+			'id'                        => $this->id,
+			'instructor_id'             => $this->instructorId,
+			'kind'                      => $this->kind,
+			'title'                     => $this->title,
+			'description'               => $this->description,
+			'duration_minutes'          => $this->durationMinutes,
+			'price'                     => $this->price,
+			'currency'                  => $this->currency,
+			'billing_mode'              => $this->billingMode,
+			'allow_weekly'              => $this->allowWeekly,
+			'capacity'                  => $this->capacity,
+			'term_start'                => $this->termStart,
+			'term_end'                  => $this->termEnd,
+			'class_time'                => $this->classTime,
+			'enrollment_deadline'       => $this->enrollmentDeadline,
+			'withdrawal_deadline'       => $this->withdrawalDeadline,
+			'schedule_note'             => $this->scheduleNote,
+			'cancellation_cutoff_hours' => $this->cancellationCutoffHours,
+			'access_mode'               => $this->accessMode,
+			'is_active'                 => $this->isActive,
 		];
 
 		if ( $includeEtransferEmail ) {

src/Offering/OfferingController.php

@@ -3,11 +3,17 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Offering;
 
+use Unsupervised\Schedular\Auth\AccessSettings;
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class OfferingController {
 
-	public function __construct( private OfferingRepository $repository ) {}
+	public function __construct(
+		private OfferingRepository $repository,
+		private ClassSlotReconciler $reconciler,
+		private AccessSettings $access = new AccessSettings(),
+	) {}
 
 	public function renderPage(): void {
 		if ( ! current_user_can( RoleManager::CAP_MANAGE_OFFERINGS ) ) {
@@ -17,8 +23,27 @@ class OfferingController {
 		$instructorId = get_current_user_id();
 		$manageAll    = current_user_can( RoleManager::CAP_MANAGE_INSTRUCTORS );
 
+		$notice = '';
 		if ( isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_offering_action' ) ) {
-			$this->handleFormAction( $instructorId, $manageAll );
+			$notice = $this->handleFormAction( $instructorId, $manageAll );
+		}
+
+		// Studio admins may assign any instructor to a class; a plain instructor
+		// only ever creates classes for themselves, so the picker is theirs alone.
+		$instructors = $manageAll ? $this->instructorOptions() : [];
+
+		// View-state query param only (which offering the form is editing) —
+		// nothing is mutated from it, so no nonce applies.
+		// phpcs:disable WordPress.Security.NonceVerification.Recommended
+		$editId = absint( Val::int( $_GET['usc_edit'] ?? 0 ) );
+		// phpcs:enable WordPress.Security.NonceVerification.Recommended
+
+		$editing = null;
+		if ( $editId > 0 ) {
+			$candidate = $this->repository->findById( $editId );
+			if ( $candidate && ( $manageAll || $candidate->instructorId === $instructorId ) ) {
+				$editing = $candidate;
+			}
 		}
 
 		$offerings = $manageAll
@@ -28,17 +53,42 @@ class OfferingController {
 		include USC_PLUGIN_DIR . 'templates/admin/offerings.php';
 	}
 
-	private function handleFormAction( int $instructorId, bool $manageAll ): void {
+	/**
+	 * Process the posted add/update/delete action, returning a status notice for
+	 * display (e.g. how many booking slots a scheduled class cleared, or that a
+	 * booked lesson clashes with it). An empty string means nothing to report.
+	 */
+	private function handleFormAction( int $instructorId, bool $manageAll ): string {
 		// Nonce is verified by the caller (renderPage) before this method runs.
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$action = sanitize_key( wp_unslash( $_POST['usc_action'] ?? '' ) );
+		$action = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ?? '' ) ) );
 
 		if ( 'add' === $action ) {
-			$this->addOffering( $instructorId );
+			$offering = $this->offeringFromPost( $instructorId, $manageAll );
+			if ( null !== $offering ) {
+				$this->repository->insert( $offering );
+
+				return $this->reconcileNotice( $offering );
+			}
+		}
+
+		if ( 'update' === $action ) {
+			$offeringId = absint( Val::int( $_POST['offering_id'] ?? 0 ) );
+			if ( $offeringId > 0 ) {
+				$existing = $this->repository->findById( $offeringId );
+				if ( $existing && ( $manageAll || $existing->instructorId === $instructorId ) ) {
+					$offering = $this->offeringFromPost( $instructorId, $manageAll, $existing );
+					if ( null !== $offering ) {
+						$this->repository->update( $offeringId, $offering );
+
+						return $this->reconcileNotice( $offering );
+					}
+				}
+			}
 		}
 
 		if ( 'delete' === $action ) {
-			$offeringId = absint( $_POST['offering_id'] ?? 0 );
+			$offeringId = absint( Val::int( $_POST['offering_id'] ?? 0 ) );
 			if ( $offeringId > 0 ) {
 				$offering = $this->repository->findById( $offeringId );
 				if ( $offering && ( $manageAll || $offering->instructorId === $instructorId ) ) {
@@ -47,42 +97,197 @@ class OfferingController {
 			}
 		}
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
+
+		return '';
 	}
 
-	private function addOffering( int $instructorId ): void {
-		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$title = sanitize_text_field( wp_unslash( $_POST['title'] ?? '' ) );
-		$kind  = sanitize_key( wp_unslash( $_POST['kind'] ?? '' ) );
-
-		if ( '' === $title || ! in_array( $kind, Offering::VALID_KINDS, true ) ) {
-			return;
+	/**
+	 * Clear the assigned instructor's open booking slots that collide with a
+	 * scheduled group class and describe the result, warning about any booked
+	 * lesson that clashes (which the studio must resolve by hand).
+	 */
+	private function reconcileNotice( Offering $offering ): string {
+		if ( Offering::KIND_GROUP_CLASS !== $offering->kind ) {
+			return '';
 		}
 
-		$billingMode = sanitize_key( wp_unslash( $_POST['billing_mode'] ?? Offering::BILLING_ONE_TIME ) );
+		$result = $this->reconciler->reconcile( $offering );
+		$parts  = [];
+
+		if ( $result['removed'] > 0 ) {
+			$parts[] = sprintf(
+				/* translators: %d: number of open booking slots removed. */
+				_n(
+					'%d open booking slot was removed to hold the class time.',
+					'%d open booking slots were removed to hold the class time.',
+					$result['removed'],
+					'unsupervised-schedular'
+				),
+				$result['removed']
+			);
+		}
+
+		foreach ( $result['conflicts'] as $startDt ) {
+			$parts[] = sprintf(
+				/* translators: %s: date and time of the already-booked lesson that clashes. */
+				esc_html__( 'Conflict: a lesson is already booked at %s during this class.', 'unsupervised-schedular' ),
+				(string) mysql2date( 'M j, Y g:i a', $startDt )
+			);
+		}
+
+		return implode( ' ', $parts );
+	}
+
+	/**
+	 * Instructors offered in the assignment select, by display name.
+	 *
+	 * Includes everyone holding the `us_instructor` role plus, when the site owner
+	 * has left administrators acting as instructors (the default single-account
+	 * setup), WordPress administrators — who teach through the dynamic capability
+	 * grant rather than the role. Without them a solo studio owner running the
+	 * business from an admin account would find no one to assign a class to.
+	 *
+	 * @return list<array{id: int, name: string}>
+	 */
+	private function instructorOptions(): array {
+		$roles = [ RoleManager::INSTRUCTOR ];
+		if ( $this->access->adminsAreInstructors() ) {
+			$roles[] = 'administrator';
+		}
+
+		$users = array_filter(
+			get_users(
+				[
+					'role__in' => $roles,
+					'orderby'  => 'display_name',
+					'order'    => 'ASC',
+				]
+			),
+			static fn( mixed $u ): bool => $u instanceof \WP_User
+		);
+
+		return array_values(
+			array_map(
+				static fn( \WP_User $u ): array => [
+					'id'   => (int) $u->ID,
+					'name' => '' !== (string) $u->display_name ? (string) $u->display_name : (string) $u->user_email,
+				],
+				$users
+			)
+		);
+	}
+
+	/**
+	 * Build an offering from the submitted add/edit form, or null when the
+	 * submission is invalid. When `$existing` is given the result is an edit:
+	 * it keeps the existing id and currency so an update can never rewrite those
+	 * from whoever submits the form.
+	 *
+	 * The owning instructor normally stays fixed (the creator on add, the existing
+	 * owner on edit). A studio admin (`$manageAll`) may instead assign the class to
+	 * any instructor via the picker; a blank or absent choice keeps the default.
+	 */
+	private function offeringFromPost( int $instructorId, bool $manageAll, ?Offering $existing = null ): ?Offering {
+		// Nonce is verified by the caller (renderPage) before this method runs.
+		// phpcs:disable WordPress.Security.NonceVerification.Missing
+		$title = sanitize_text_field( Val::string( wp_unslash( $_POST['title'] ?? '' ) ) );
+		$kind  = sanitize_key( Val::string( wp_unslash( $_POST['kind'] ?? '' ) ) );
+
+		if ( '' === $title || ! in_array( $kind, Offering::VALID_KINDS, true ) ) {
+			return null;
+		}
+
+		$scheduleNote   = $this->nullableText( sanitize_text_field( Val::string( wp_unslash( $_POST['schedule_note'] ?? '' ) ) ) );
+		$etransferEmail = $this->nullableText( sanitize_email( Val::string( wp_unslash( $_POST['etransfer_email'] ?? '' ) ) ) );
+
+		// Reject over-long fixed-size fields rather than let the DB silently drop them.
+		if ( mb_strlen( $title ) > Offering::MAX_TITLE_LENGTH
+			|| ( null !== $scheduleNote && mb_strlen( $scheduleNote ) > Offering::MAX_SCHEDULE_NOTE_LENGTH )
+			|| ( null !== $etransferEmail && mb_strlen( $etransferEmail ) > Offering::MAX_ETRANSFER_EMAIL_LENGTH )
+		) {
+			return null;
+		}
+
+		$billingMode = sanitize_key( Val::string( wp_unslash( $_POST['billing_mode'] ?? Offering::BILLING_ONE_TIME ) ) );
 		if ( ! in_array( $billingMode, Offering::VALID_BILLING_MODES, true ) ) {
 			$billingMode = Offering::BILLING_ONE_TIME;
 		}
 
-		$duration = absint( $_POST['duration_minutes'] ?? 0 );
-		$capacity = absint( $_POST['capacity'] ?? 0 );
+		$duration = absint( Val::int( $_POST['duration_minutes'] ?? 0 ) );
+		$capacity = absint( Val::int( $_POST['capacity'] ?? 0 ) );
 
-		$this->repository->insert(
-			new Offering(
-				instructorId:    $instructorId,
-				kind:            $kind,
-				title:           $title,
-				price:           max( 0.0, (float) sanitize_text_field( wp_unslash( $_POST['price'] ?? '0' ) ) ),
-				billingMode:     $billingMode,
-				durationMinutes: $duration > 0 ? $duration : null,
-				allowWeekly:     isset( $_POST['allow_weekly'] ),
-				capacity:        $capacity > 0 ? $capacity : null,
-				scheduleNote:    $this->nullableText( sanitize_text_field( wp_unslash( $_POST['schedule_note'] ?? '' ) ) ),
-				etransferEmail:  $this->nullableText( sanitize_email( wp_unslash( $_POST['etransfer_email'] ?? '' ) ) ),
-			)
+		// A blank cutoff means "use the studio default" (null); any entered value
+		// (including 0 — cancel any time) is a per-offering override.
+		$cutoffRaw   = trim( sanitize_text_field( Val::string( wp_unslash( $_POST['cancellation_cutoff_hours'] ?? '' ) ) ) );
+		$cutoffHours = '' === $cutoffRaw ? null : absint( Val::int( $cutoffRaw ) );
+
+		// Term dates: a class either meets once (term ends the day it starts)
+		// or repeats weekly for a set number of sessions.
+		$termStart = Offering::normalizeDate( sanitize_text_field( Val::string( wp_unslash( $_POST['term_start'] ?? '' ) ) ) );
+		$termEnd   = null;
+		if ( null !== $termStart ) {
+			$recurrence = sanitize_key( Val::string( wp_unslash( $_POST['term_recurrence'] ?? 'single' ) ) );
+			$sessions   = absint( Val::int( $_POST['term_sessions'] ?? 1 ) );
+			$termEnd    = 'weekly' === $recurrence ? Offering::weeklyTermEnd( $termStart, $sessions ) : $termStart;
+		}
+
+		$classTime = Offering::normalizeTime( sanitize_text_field( Val::string( wp_unslash( $_POST['class_time'] ?? '' ) ) ) );
+
+		// A blank (or invalid) deadline means "use the default" — the first class
+		// day (term_start), applied by Offering::effectiveEnrollmentDeadline().
+		$enrollmentDeadline = Offering::normalizeDate( sanitize_text_field( Val::string( wp_unslash( $_POST['enrollment_deadline'] ?? '' ) ) ) );
+
+		// A blank (or invalid) withdrawal deadline leaves the column NULL, which
+		// keeps self-withdrawal open for the class's whole life
+		// (Offering::isWithdrawalOpen()). A set date closes it after that day.
+		$withdrawalDeadline = Offering::normalizeDate( sanitize_text_field( Val::string( wp_unslash( $_POST['withdrawal_deadline'] ?? '' ) ) ) );
+
+		return new Offering(
+			instructorId:    $this->resolveInstructorId( $instructorId, $manageAll, $existing ),
+			kind:            $kind,
+			title:           $title,
+			price:           max( 0.0, (float) sanitize_text_field( Val::string( wp_unslash( $_POST['price'] ?? '0' ) ) ) ),
+			currency:        null !== $existing ? $existing->currency : 'CAD',
+			billingMode:     $billingMode,
+			description:     $this->nullableText( sanitize_textarea_field( Val::string( wp_unslash( $_POST['description'] ?? '' ) ) ) ),
+			durationMinutes: $duration > 0 ? $duration : null,
+			allowWeekly:     isset( $_POST['allow_weekly'] ),
+			capacity:        $capacity > 0 ? $capacity : null,
+			termStart:       $termStart,
+			termEnd:         $termEnd,
+			classTime:       $classTime,
+			enrollmentDeadline: $enrollmentDeadline,
+			withdrawalDeadline: $withdrawalDeadline,
+			scheduleNote:    $scheduleNote,
+			etransferEmail:  $etransferEmail,
+			cancellationCutoffHours: $cutoffHours,
+			accessMode:      isset( $_POST['invite_only'] ) ? Offering::ACCESS_INVITE_ONLY : Offering::ACCESS_PUBLIC,
+			isActive:        isset( $_POST['is_active'] ),
+			id:              $existing?->id,
 		);
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
 	}
 
+	/**
+	 * The instructor the offering should belong to. A studio admin may reassign it
+	 * via the posted `class_instructor_id`; otherwise it stays with the existing
+	 * owner (edit) or the current user (add). A plain instructor can never change
+	 * the owner, so the posted value is ignored unless `$manageAll` is set.
+	 */
+	private function resolveInstructorId( int $instructorId, bool $manageAll, ?Offering $existing ): int {
+		$fallback = null !== $existing ? $existing->instructorId : $instructorId;
+
+		if ( ! $manageAll ) {
+			return $fallback;
+		}
+
+		// Nonce is verified by the caller (renderPage) before this method runs.
+		// phpcs:ignore WordPress.Security.NonceVerification.Missing
+		$posted = absint( Val::int( $_POST['class_instructor_id'] ?? 0 ) );
+
+		return $posted > 0 ? $posted : $fallback;
+	}
+
 	private function nullableText( string $value ): ?string {
 		return '' === $value ? null : $value;
 	}

src/Offering/OfferingEndpoint.php

@@ -4,11 +4,22 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Offering;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Auth\UserName;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
+use Unsupervised\Schedular\Val;
 
 class OfferingEndpoint {
 
-	public function __construct( private OfferingRepository $repository ) {}
+	public function __construct(
+		private OfferingRepository $repository,
+		private GroupAccessRepository $access,
+	) {}
 
+	/**
+	 * Registers this endpoint's REST routes.
+	 *
+	 * @param non-falsy-string $route_namespace REST namespace the routes are registered under (e.g. `us-scheduler/v1`).
+	 */
 	public function registerRoutes( string $route_namespace ): void {
 		register_rest_route(
 			$route_namespace,
@@ -17,7 +28,7 @@ class OfferingEndpoint {
 				[
 					'methods'             => \WP_REST_Server::READABLE,
 					'callback'            => [ $this, 'index' ],
-					'permission_callback' => [ $this, 'canBook' ],
+					'permission_callback' => [ $this, 'canRead' ],
 					'args'                => [
 						'instructor_id' => [
 							'type'    => 'integer',
@@ -56,38 +67,101 @@ class OfferingEndpoint {
 	}
 
 	public function index( \WP_REST_Request $request ): \WP_REST_Response {
-		$offerings = $this->repository->findAll(
-			(int) $request->get_param( 'instructor_id' ),
-			(string) $request->get_param( 'kind' ),
-			activeOnly: true,
-		);
+		$instructorId = Val::int( $request->get_param( 'instructor_id' ) );
+		$kind         = Val::string( $request->get_param( 'kind' ) );
 
-		// Public listing: omit the private e-transfer destination email.
-		return new \WP_REST_Response( array_map( fn( Offering $o ) => $o->toArray( includeEtransferEmail: false ), $offerings ), 200 );
+		// The public catalogue is public offerings only; invite-only classes are
+		// hidden from it and surfaced separately to the students granted access.
+		$offerings = $this->repository->findAll( $instructorId, $kind, activeOnly: true, accessMode: Offering::ACCESS_PUBLIC );
+
+		foreach ( $this->grantedInviteOnly( $instructorId, $kind ) as $granted ) {
+			$offerings[] = $granted;
+		}
+
+		// Public listing: omit the private e-transfer destination email, and
+		// attach the assigned instructor's display name so the front end can show
+		// students who teaches each class.
+		return new \WP_REST_Response( array_map( [ $this, 'present' ], $offerings ), 200 );
+	}
+
+	/**
+	 * A public-facing offering array with the assigned instructor's name added —
+	 * their real name or nickname, never the login (empty when the instructor
+	 * account no longer exists). See {@see UserName::format()}.
+	 *
+	 * @return array<string, mixed>
+	 */
+	private function present( Offering $offering ): array {
+		$out  = $offering->toArray( includeEtransferEmail: false );
+		$user = get_userdata( $offering->instructorId );
+
+		$out['instructor_name'] = UserName::format( $user instanceof \WP_User ? $user : null );
+
+		return $out;
+	}
+
+	/**
+	 * The active invite-only offerings the caller has been granted access to,
+	 * matching the same instructor/kind filters as the public catalogue.
+	 *
+	 * @return list<Offering>
+	 */
+	private function grantedInviteOnly( int $instructorId, string $kind ): array {
+		$grantedIds = $this->access->findGrantedOfferingIds( get_current_user_id() );
+		if ( [] === $grantedIds ) {
+			return [];
+		}
+
+		$out = [];
+		foreach ( $grantedIds as $offeringId ) {
+			$offering = $this->repository->findById( $offeringId );
+
+			if (
+				null === $offering
+				|| ! $offering->isActive
+				|| ! $offering->isInviteOnly()
+				|| ( $instructorId > 0 && $offering->instructorId !== $instructorId )
+				|| ( '' !== $kind && $offering->kind !== $kind )
+			) {
+				continue;
+			}
+
+			$out[] = $offering;
+		}
+
+		return $out;
 	}
 
 	public function create( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$title = sanitize_text_field( (string) $request->get_param( 'title' ) );
+		$title = sanitize_text_field( Val::string( $request->get_param( 'title' ) ) );
 		if ( '' === $title ) {
 			return $this->invalid( __( 'A title is required.', 'unsupervised-schedular' ) );
 		}
 
-		$kind = (string) $request->get_param( 'kind' );
+		$kind = Val::string( $request->get_param( 'kind' ) );
 		if ( ! in_array( $kind, Offering::VALID_KINDS, true ) ) {
 			return $this->invalid( __( 'Invalid offering kind.', 'unsupervised-schedular' ) );
 		}
 
-		$billingMode = (string) ( $request->get_param( 'billing_mode' ) ?? Offering::BILLING_ONE_TIME );
+		$billingMode = Val::string( $request->get_param( 'billing_mode' ) ?? Offering::BILLING_ONE_TIME );
 		if ( ! in_array( $billingMode, Offering::VALID_BILLING_MODES, true ) ) {
 			return $this->invalid( __( 'Invalid billing mode.', 'unsupervised-schedular' ) );
 		}
 
+		$scheduleNote   = $this->nullableText( $request->get_param( 'schedule_note' ) );
+		$etransferEmail = $this->nullableEmail( $request->get_param( 'etransfer_email' ) );
+
+		$lengthError = $this->checkLengths( $title, $scheduleNote, $etransferEmail );
+		if ( $lengthError instanceof \WP_Error ) {
+			return $lengthError;
+		}
+
 		$offering = new Offering(
 			instructorId:    get_current_user_id(),
 			kind:            $kind,
 			title:           $title,
 			price:           $this->price( $request->get_param( 'price' ) ),
-			currency:        sanitize_text_field( (string) ( $request->get_param( 'currency' ) ?? 'CAD' ) ),
+			currency:        sanitize_text_field( Val::string( $request->get_param( 'currency' ) ?? 'CAD' ) ),
 			billingMode:     $billingMode,
 			description:     $this->nullableText( $request->get_param( 'description' ) ),
 			durationMinutes: $this->nullableInt( $request->get_param( 'duration_minutes' ) ),
@@ -95,8 +169,11 @@ class OfferingEndpoint {
 			capacity:        $this->nullableInt( $request->get_param( 'capacity' ) ),
 			termStart:       $this->nullableText( $request->get_param( 'term_start' ) ),
 			termEnd:         $this->nullableText( $request->get_param( 'term_end' ) ),
-			scheduleNote:    $this->nullableText( $request->get_param( 'schedule_note' ) ),
-			etransferEmail:  $this->nullableEmail( $request->get_param( 'etransfer_email' ) ),
+			enrollmentDeadline: $this->nullableText( $request->get_param( 'enrollment_deadline' ) ),
+			scheduleNote:    $scheduleNote,
+			etransferEmail:  $etransferEmail,
+			cancellationCutoffHours: $this->nullableInt( $request->get_param( 'cancellation_cutoff_hours' ) ),
+			accessMode:      $this->accessMode( $request->get_param( 'access_mode' ), Offering::ACCESS_PUBLIC ),
 			isActive:        null === $request->get_param( 'is_active' ) ? true : (bool) $request->get_param( 'is_active' ),
 		);
 
@@ -106,7 +183,7 @@ class OfferingEndpoint {
 	}
 
 	public function update( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$id       = absint( $request->get_param( 'id' ) );
+		$id       = absint( Val::int( $request->get_param( 'id' ) ) );
 		$existing = $this->repository->findById( $id );
 
 		if ( null === $existing ) {
@@ -117,22 +194,31 @@ class OfferingEndpoint {
 			return new \WP_Error( 'forbidden', __( 'You cannot edit this offering.', 'unsupervised-schedular' ), [ 'status' => 403 ] );
 		}
 
-		$kind = $request->has_param( 'kind' ) ? (string) $request->get_param( 'kind' ) : $existing->kind;
+		$kind = $request->has_param( 'kind' ) ? Val::string( $request->get_param( 'kind' ) ) : $existing->kind;
 		if ( ! in_array( $kind, Offering::VALID_KINDS, true ) ) {
 			return $this->invalid( __( 'Invalid offering kind.', 'unsupervised-schedular' ) );
 		}
 
-		$billingMode = $request->has_param( 'billing_mode' ) ? (string) $request->get_param( 'billing_mode' ) : $existing->billingMode;
+		$billingMode = $request->has_param( 'billing_mode' ) ? Val::string( $request->get_param( 'billing_mode' ) ) : $existing->billingMode;
 		if ( ! in_array( $billingMode, Offering::VALID_BILLING_MODES, true ) ) {
 			return $this->invalid( __( 'Invalid billing mode.', 'unsupervised-schedular' ) );
 		}
 
+		$title          = $request->has_param( 'title' ) ? sanitize_text_field( Val::string( $request->get_param( 'title' ) ) ) : $existing->title;
+		$scheduleNote   = $request->has_param( 'schedule_note' ) ? $this->nullableText( $request->get_param( 'schedule_note' ) ) : $existing->scheduleNote;
+		$etransferEmail = $request->has_param( 'etransfer_email' ) ? $this->nullableEmail( $request->get_param( 'etransfer_email' ) ) : $existing->etransferEmail;
+
+		$lengthError = $this->checkLengths( $title, $scheduleNote, $etransferEmail );
+		if ( $lengthError instanceof \WP_Error ) {
+			return $lengthError;
+		}
+
 		$offering = new Offering(
 			instructorId:    $existing->instructorId,
 			kind:            $kind,
-			title:           $request->has_param( 'title' ) ? sanitize_text_field( (string) $request->get_param( 'title' ) ) : $existing->title,
+			title:           $title,
 			price:           $request->has_param( 'price' ) ? $this->price( $request->get_param( 'price' ) ) : $existing->price,
-			currency:        $request->has_param( 'currency' ) ? sanitize_text_field( (string) $request->get_param( 'currency' ) ) : $existing->currency,
+			currency:        $request->has_param( 'currency' ) ? sanitize_text_field( Val::string( $request->get_param( 'currency' ) ) ) : $existing->currency,
 			billingMode:     $billingMode,
 			description:     $request->has_param( 'description' ) ? $this->nullableText( $request->get_param( 'description' ) ) : $existing->description,
 			durationMinutes: $request->has_param( 'duration_minutes' ) ? $this->nullableInt( $request->get_param( 'duration_minutes' ) ) : $existing->durationMinutes,
@@ -140,8 +226,11 @@ class OfferingEndpoint {
 			capacity:        $request->has_param( 'capacity' ) ? $this->nullableInt( $request->get_param( 'capacity' ) ) : $existing->capacity,
 			termStart:       $request->has_param( 'term_start' ) ? $this->nullableText( $request->get_param( 'term_start' ) ) : $existing->termStart,
 			termEnd:         $request->has_param( 'term_end' ) ? $this->nullableText( $request->get_param( 'term_end' ) ) : $existing->termEnd,
-			scheduleNote:    $request->has_param( 'schedule_note' ) ? $this->nullableText( $request->get_param( 'schedule_note' ) ) : $existing->scheduleNote,
-			etransferEmail:  $request->has_param( 'etransfer_email' ) ? $this->nullableEmail( $request->get_param( 'etransfer_email' ) ) : $existing->etransferEmail,
+			enrollmentDeadline: $request->has_param( 'enrollment_deadline' ) ? $this->nullableText( $request->get_param( 'enrollment_deadline' ) ) : $existing->enrollmentDeadline,
+			scheduleNote:    $scheduleNote,
+			etransferEmail:  $etransferEmail,
+			cancellationCutoffHours: $request->has_param( 'cancellation_cutoff_hours' ) ? $this->nullableInt( $request->get_param( 'cancellation_cutoff_hours' ) ) : $existing->cancellationCutoffHours,
+			accessMode:      $request->has_param( 'access_mode' ) ? $this->accessMode( $request->get_param( 'access_mode' ), $existing->accessMode ) : $existing->accessMode,
 			isActive:        $request->has_param( 'is_active' ) ? (bool) $request->get_param( 'is_active' ) : $existing->isActive,
 			id:              $id,
 		);
@@ -152,7 +241,7 @@ class OfferingEndpoint {
 	}
 
 	public function delete( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$id       = absint( $request->get_param( 'id' ) );
+		$id       = absint( Val::int( $request->get_param( 'id' ) ) );
 		$existing = $this->repository->findById( $id );
 
 		if ( null === $existing ) {
@@ -173,12 +262,16 @@ class OfferingEndpoint {
 	}
 
 	/**
-	 * Reading the offerings catalogue is only needed by the logged-in student
-	 * booking flow, so it requires the same capability as booking — there is no
-	 * anonymous consumer.
+	 * Reading the offerings catalogue has no anonymous consumer, so it stays
+	 * behind a login. Students reach it through the booking flow, and studio
+	 * admins and instructors reach it from the block editor's group-class
+	 * pickers — an administrator holds `manage_offerings` but not
+	 * `book_lesson`, so both capabilities open the listing.
 	 */
-	public function canBook(): bool {
-		return is_user_logged_in() && current_user_can( RoleManager::CAP_BOOK_LESSON );
+	public function canRead(): bool {
+		return is_user_logged_in()
+			&& ( current_user_can( RoleManager::CAP_BOOK_LESSON )
+				|| current_user_can( RoleManager::CAP_MANAGE_OFFERINGS ) );
 	}
 
 	/**
@@ -194,18 +287,52 @@ class OfferingEndpoint {
 		return new \WP_Error( 'invalid_offering', $message, [ 'status' => 400 ] );
 	}
 
+	/**
+	 * Reject any fixed-size field whose value exceeds its column length, so an
+	 * over-long value is refused with a clear 400 rather than silently dropped
+	 * by the database.
+	 */
+	private function checkLengths( string $title, ?string $scheduleNote, ?string $etransferEmail ): ?\WP_Error {
+		$fields = [
+			[ __( 'title', 'unsupervised-schedular' ), $title, Offering::MAX_TITLE_LENGTH ],
+			[ __( 'schedule note', 'unsupervised-schedular' ), $scheduleNote, Offering::MAX_SCHEDULE_NOTE_LENGTH ],
+			[ __( 'e-transfer email', 'unsupervised-schedular' ), $etransferEmail, Offering::MAX_ETRANSFER_EMAIL_LENGTH ],
+		];
+
+		foreach ( $fields as [ $name, $value, $max ] ) {
+			if ( null !== $value && mb_strlen( $value ) > $max ) {
+				return $this->invalid(
+					sprintf(
+						/* translators: 1: field name, 2: maximum character count. */
+						__( 'The %1$s must be %2$d characters or fewer.', 'unsupervised-schedular' ),
+						$name,
+						$max
+					)
+				);
+			}
+		}
+
+		return null;
+	}
+
 	private function price( mixed $value ): float {
-		return max( 0.0, (float) $value );
+		return max( 0.0, Val::float( $value ) );
 	}
 
 	private function nullableEmail( mixed $value ): ?string {
-		$email = sanitize_email( (string) $value );
+		$email = sanitize_email( Val::string( $value ) );
 
 		return '' !== $email ? $email : null;
 	}
 
+	private function accessMode( mixed $value, string $fallback ): string {
+		$mode = Val::string( $value );
+
+		return in_array( $mode, Offering::VALID_ACCESS_MODES, true ) ? $mode : $fallback;
+	}
+
 	private function nullableInt( mixed $value ): ?int {
-		return ( null === $value || '' === $value ) ? null : (int) $value;
+		return ( null === $value || '' === $value ) ? null : Val::int( $value );
 	}
 
 	private function nullableText( mixed $value ): ?string {
@@ -213,6 +340,6 @@ class OfferingEndpoint {
 			return null;
 		}
 
-		return sanitize_text_field( (string) $value );
+		return sanitize_text_field( Val::string( $value ) );
 	}
 }

src/Offering/OfferingRepository.php

@@ -14,11 +14,13 @@ class OfferingRepository {
 	/**
 	 * Column formats aligned to {@see columns()} (instructor_id, kind, title,
 	 * description, duration_minutes, price, currency, billing_mode, allow_weekly,
-	 * capacity, term_start, term_end, schedule_note, etransfer_email, is_active).
+	 * capacity, term_start, term_end, class_time, enrollment_deadline,
+	 * withdrawal_deadline, schedule_note, etransfer_email,
+	 * cancellation_cutoff_hours, access_mode, is_active).
 	 *
 	 * @var list<string>
 	 */
-	private const COLUMN_FORMATS = [ '%d', '%s', '%s', '%s', '%d', '%f', '%s', '%s', '%d', '%d', '%s', '%s', '%s', '%s', '%d' ];
+	private const COLUMN_FORMATS = [ '%d', '%s', '%s', '%s', '%d', '%f', '%s', '%s', '%d', '%d', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%d', '%s', '%d' ];
 
 	public function insert( Offering $offering ): int {
 		$this->db->insert(
@@ -47,30 +49,37 @@ class OfferingRepository {
 	 */
 	private function columns( Offering $offering ): array {
 		return [
-			'instructor_id'    => $offering->instructorId,
-			'kind'             => $offering->kind,
-			'title'            => $offering->title,
-			'description'      => $offering->description,
-			'duration_minutes' => $offering->durationMinutes,
-			'price'            => $offering->price,
-			'currency'         => $offering->currency,
-			'billing_mode'     => $offering->billingMode,
-			'allow_weekly'     => $offering->allowWeekly ? 1 : 0,
-			'capacity'         => $offering->capacity,
-			'term_start'       => $offering->termStart,
-			'term_end'         => $offering->termEnd,
-			'schedule_note'    => $offering->scheduleNote,
-			'etransfer_email'  => $offering->etransferEmail,
-			'is_active'        => $offering->isActive ? 1 : 0,
+			'instructor_id'             => $offering->instructorId,
+			'kind'                      => $offering->kind,
+			'title'                     => $offering->title,
+			'description'               => $offering->description,
+			'duration_minutes'          => $offering->durationMinutes,
+			'price'                     => $offering->price,
+			'currency'                  => $offering->currency,
+			'billing_mode'              => $offering->billingMode,
+			'allow_weekly'              => $offering->allowWeekly ? 1 : 0,
+			'capacity'                  => $offering->capacity,
+			'term_start'                => $offering->termStart,
+			'term_end'                  => $offering->termEnd,
+			'class_time'                => $offering->classTime,
+			'enrollment_deadline'       => $offering->enrollmentDeadline,
+			'withdrawal_deadline'       => $offering->withdrawalDeadline,
+			'schedule_note'             => $offering->scheduleNote,
+			'etransfer_email'           => $offering->etransferEmail,
+			'cancellation_cutoff_hours' => $offering->cancellationCutoffHours,
+			'access_mode'               => $offering->accessMode,
+			'is_active'                 => $offering->isActive ? 1 : 0,
 		];
 	}
 
 	/**
-	 * Find offerings, optionally filtered by instructor, kind, and active state.
+	 * Find offerings, optionally filtered by instructor, kind, active state, and
+	 * access mode (e.g. `Offering::ACCESS_PUBLIC` to exclude invite-only classes
+	 * from the public catalogue).
 	 *
 	 * @return list<Offering>
 	 */
-	public function findAll( int $instructorId = 0, string $kind = '', ?bool $activeOnly = null ): array {
+	public function findAll( int $instructorId = 0, string $kind = '', ?bool $activeOnly = null, ?string $accessMode = null ): array {
 		$where  = [ '1 = 1' ];
 		$params = [];
 
@@ -89,19 +98,24 @@ class OfferingRepository {
 			$params[] = $activeOnly ? 1 : 0;
 		}
 
-		$whereClause = implode( ' AND ', $where );
-		$sql         = "SELECT * FROM {$this->table} WHERE {$whereClause} ORDER BY title ASC";
+		if ( null !== $accessMode ) {
+			$where[]  = 'access_mode = %s';
+			$params[] = $accessMode;
+		}
 
-		$rows = $params
-			? $this->db->get_results( $this->db->prepare( $sql, $params ) )
-			: $this->db->get_results( $sql );
+		$whereClause = implode( ' AND ', $where );
+		$sql         = "SELECT * FROM %i WHERE {$whereClause} ORDER BY title ASC";
+
+		$rows = $this->db->get_results(
+			$this->db->prepare( $sql, array_merge( [ $this->table ], $params ) )
+		);
 
 		return array_map( Offering::fromRow( ... ), $rows ?? [] );
 	}
 
 	public function findById( int $id ): ?Offering {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE id = %d", $id )
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
 		);
 
 		return $row ? Offering::fromRow( $row ) : null;

src/Payment/BillingMethodResolver.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Payment;
 
+use Unsupervised\Schedular\Val;
+
 /**
  * Resolves the billing method for a student: a per-student override if set,
  * otherwise the studio default — card when Stripe is configured, e-transfer when
@@ -15,7 +17,7 @@ class BillingMethodResolver {
 	public function __construct( private StudioSettings $settings ) {}
 
 	public function resolve( int $studentId ): string {
-		$override = (string) get_user_meta( $studentId, self::META_METHOD, true );
+		$override = Val::string( get_user_meta( $studentId, self::META_METHOD, true ) );
 		if ( in_array( $override, Payment::VALID_METHODS, true ) ) {
 			return $override;
 		}

src/Payment/Credit.php

@@ -0,0 +1,79 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Payment;
+
+use Unsupervised\Schedular\Val;
+
+/**
+ * A studio credit held on a student's account — money already paid for a lesson
+ * that was later cancelled. Credits are consumed against future scheduled-billing
+ * charges (weekly / monthly) before the student is asked to pay, oldest first.
+ */
+class Credit {
+
+	public const STATUS_AVAILABLE = 'available';
+	public const STATUS_CONSUMED  = 'consumed';
+
+	/**
+	 * All valid credit statuses.
+	 *
+	 * @var list<string>
+	 */
+	public const VALID_STATUSES = [ self::STATUS_AVAILABLE, self::STATUS_CONSUMED ];
+
+	public function __construct(
+		public readonly int $studentId,
+		public readonly float $amount,
+		public readonly float $remaining,
+		public readonly string $currency = 'CAD',
+		public readonly ?int $sourcePaymentId = null,
+		public readonly ?int $sourceLessonId = null,
+		public readonly ?string $reason = null,
+		public readonly string $status = self::STATUS_AVAILABLE,
+		public readonly ?string $createdAt = null,
+		public readonly ?string $updatedAt = null,
+		public readonly ?int $id = null,
+	) {}
+
+	public static function fromRow( \stdClass $row ): self {
+		return new self(
+			studentId:       Val::int( $row->student_id ),
+			amount:          Val::float( $row->amount ),
+			remaining:       Val::float( $row->remaining ),
+			currency:        Val::string( $row->currency ),
+			sourcePaymentId: Val::intOrNull( $row->source_payment_id ?? null ),
+			sourceLessonId:  Val::intOrNull( $row->source_lesson_id ?? null ),
+			reason:          Val::stringOrNull( $row->reason ?? null ),
+			status:          Val::string( $row->status ),
+			createdAt:       Val::stringOrNull( $row->created_at ?? null ),
+			updatedAt:       Val::stringOrNull( $row->updated_at ?? null ),
+			id:              Val::int( $row->id ),
+		);
+	}
+
+	public function isAvailable(): bool {
+		return self::STATUS_AVAILABLE === $this->status && $this->remaining > 0.0;
+	}
+
+	/**
+	 * Returns a plain array representation of the credit.
+	 *
+	 * @return array<string, mixed>
+	 */
+	public function toArray(): array {
+		return [
+			'id'                => $this->id,
+			'student_id'        => $this->studentId,
+			'amount'            => $this->amount,
+			'remaining'         => $this->remaining,
+			'currency'          => $this->currency,
+			'source_payment_id' => $this->sourcePaymentId,
+			'source_lesson_id'  => $this->sourceLessonId,
+			'reason'            => $this->reason,
+			'status'            => $this->status,
+			'created_at'        => $this->createdAt,
+			'updated_at'        => $this->updatedAt,
+		];
+	}
+}

src/Payment/CreditRepository.php

@@ -0,0 +1,149 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Payment;
+
+class CreditRepository {
+
+	private string $table;
+
+	public function __construct( private \wpdb $db ) {
+		$this->table = $db->prefix . 'us_credits';
+	}
+
+	public function insert( Credit $credit ): int {
+		$this->db->insert(
+			$this->table,
+			[
+				'student_id'        => $credit->studentId,
+				'amount'            => $credit->amount,
+				'remaining'         => $credit->remaining,
+				'currency'          => $credit->currency,
+				'source_payment_id' => $credit->sourcePaymentId,
+				'source_lesson_id'  => $credit->sourceLessonId,
+				'reason'            => $credit->reason,
+				'status'            => $credit->status,
+				'created_at'        => current_time( 'mysql' ),
+			],
+			[ '%d', '%f', '%f', '%s', '%d', '%d', '%s', '%s', '%s' ]
+		);
+
+		return $this->db->insert_id;
+	}
+
+	public function findById( int $id ): ?Credit {
+		$row = $this->db->get_row(
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
+		);
+
+		return $row ? Credit::fromRow( $row ) : null;
+	}
+
+	/**
+	 * Whether a credit has already been issued for a cancelled lesson, so cancelling
+	 * (or re-cancelling) the same lesson never grants a second credit.
+	 */
+	public function existsForLesson( int $lessonId ): bool {
+		$found = $this->db->get_var(
+			$this->db->prepare(
+				'SELECT id FROM %i WHERE source_lesson_id = %d LIMIT 1',
+				$this->table,
+				$lessonId
+			)
+		);
+
+		return null !== $found;
+	}
+
+	/**
+	 * A student's total unused credit balance (sum of the remaining amounts of every
+	 * still-available credit).
+	 */
+	public function availableBalance( int $studentId ): float {
+		$total = $this->db->get_var(
+			$this->db->prepare(
+				'SELECT COALESCE( SUM( remaining ), 0 ) FROM %i WHERE student_id = %d AND status = %s',
+				$this->table,
+				$studentId,
+				Credit::STATUS_AVAILABLE
+			)
+		);
+
+		return round( (float) $total, 2 );
+	}
+
+	/**
+	 * A student's still-available credits, oldest first — the FIFO order they are
+	 * consumed in.
+	 *
+	 * @return list<Credit>
+	 */
+	public function findAvailableByStudent( int $studentId ): array {
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT * FROM %i WHERE student_id = %d AND status = %s AND remaining > 0 ORDER BY created_at ASC, id ASC',
+				$this->table,
+				$studentId,
+				Credit::STATUS_AVAILABLE
+			)
+		);
+
+		return array_map( Credit::fromRow( ... ), $rows ?? [] );
+	}
+
+	/**
+	 * Every credit for a student, newest first (admin history).
+	 *
+	 * @return list<Credit>
+	 */
+	public function findByStudent( int $studentId ): array {
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT * FROM %i WHERE student_id = %d ORDER BY created_at DESC, id DESC',
+				$this->table,
+				$studentId
+			)
+		);
+
+		return array_map( Credit::fromRow( ... ), $rows ?? [] );
+	}
+
+	/**
+	 * Draw down a student's credit balance by $amount, consuming their available
+	 * credits oldest first and marking each fully-spent credit `consumed`. Stops once
+	 * the amount is exhausted; a balance shorter than $amount simply drains to zero.
+	 */
+	public function consume( int $studentId, float $amount ): void {
+		$remaining = round( $amount, 2 );
+		if ( $remaining <= 0.0 ) {
+			return;
+		}
+
+		foreach ( $this->findAvailableByStudent( $studentId ) as $credit ) {
+			if ( $remaining <= 0.0 ) {
+				break;
+			}
+			if ( null === $credit->id ) {
+				continue;
+			}
+
+			$take         = min( $credit->remaining, $remaining );
+			$newRemaining = round( $credit->remaining - $take, 2 );
+			$status       = $newRemaining <= 0.0 ? Credit::STATUS_CONSUMED : Credit::STATUS_AVAILABLE;
+
+			$this->db->update(
+				$this->table,
+				[
+					'remaining'  => $newRemaining,
+					'status'     => $status,
+					'updated_at' => current_time( 'mysql' ),
+				],
+				[ 'id' => $credit->id ],
+				[ '%f', '%s', '%s' ],
+				[ '%d' ]
+			);
+
+			$remaining = round( $remaining - $take, 2 );
+		}
+	}
+}

src/Payment/Payment.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Payment;
 
+use Unsupervised\Schedular\Val;
+
 class Payment {
 
 	public const METHOD_CARD      = 'card';
@@ -42,32 +44,42 @@ class Payment {
 		public readonly string $status = self::STATUS_PENDING,
 		public readonly float $taxRate = 0.0,
 		public readonly float $taxAmount = 0.0,
+		public readonly float $creditApplied = 0.0,
+		public readonly ?string $dueDate = null,
+		public readonly ?string $periodKey = null,
+		public readonly ?string $noticeBatch = null,
 		public readonly ?string $etransferEmail = null,
 		public readonly ?string $stripePaymentIntentId = null,
 		public readonly ?string $receiptNumber = null,
 		public readonly ?string $receiptSentAt = null,
 		public readonly ?string $paidAt = null,
+		public readonly ?string $createdAt = null,
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			studentId:             (int) $row->student_id,
-			instructorId:          (int) $row->instructor_id,
-			registrationType:      $row->registration_type,
-			registrationId:        (int) $row->registration_id,
-			amount:                (float) $row->amount,
-			currency:              $row->currency,
-			method:                $row->method,
-			status:                $row->status,
-			taxRate:               (float) $row->tax_rate,
-			taxAmount:             (float) $row->tax_amount,
-			etransferEmail:        $row->etransfer_email,
-			stripePaymentIntentId: $row->stripe_payment_intent_id,
-			receiptNumber:         $row->receipt_number,
-			receiptSentAt:         $row->receipt_sent_at,
-			paidAt:                $row->paid_at,
-			id:                    (int) $row->id,
+			studentId:             Val::int( $row->student_id ),
+			instructorId:          Val::int( $row->instructor_id ),
+			registrationType:      Val::string( $row->registration_type ),
+			registrationId:        Val::int( $row->registration_id ),
+			amount:                Val::float( $row->amount ),
+			currency:              Val::string( $row->currency ),
+			method:                Val::string( $row->method ),
+			status:                Val::string( $row->status ),
+			taxRate:               Val::float( $row->tax_rate ),
+			taxAmount:             Val::float( $row->tax_amount ),
+			creditApplied:         Val::float( $row->credit_applied ?? 0 ),
+			dueDate:               Val::stringOrNull( $row->due_date ?? null ),
+			periodKey:             Val::stringOrNull( $row->period_key ?? null ),
+			noticeBatch:           Val::stringOrNull( $row->notice_batch ?? null ),
+			etransferEmail:        Val::stringOrNull( $row->etransfer_email ),
+			stripePaymentIntentId: Val::stringOrNull( $row->stripe_payment_intent_id ),
+			receiptNumber:         Val::stringOrNull( $row->receipt_number ),
+			receiptSentAt:         Val::stringOrNull( $row->receipt_sent_at ),
+			paidAt:                Val::stringOrNull( $row->paid_at ),
+			createdAt:             Val::stringOrNull( $row->created_at ),
+			id:                    Val::int( $row->id ),
 		);
 	}
 
@@ -75,6 +87,15 @@ class Payment {
 		return self::STATUS_PAID === $this->status;
 	}
 
+	/**
+	 * Whether this payment was generated by the daily billing scan (weekly /
+	 * monthly) rather than taken at registration. Scheduled payments carry a due
+	 * date, can cover several lessons, and are never auto-voided on cancellation.
+	 */
+	public function isScheduled(): bool {
+		return null !== $this->dueDate;
+	}
+
 	/**
 	 * Amount billed including tax.
 	 */
@@ -82,6 +103,28 @@ class Payment {
 		return round( $this->amount + $this->taxAmount, 2 );
 	}
 
+	/**
+	 * What the student still owes after any account credit applied to this payment.
+	 * The full `total()` less `creditApplied`, floored at zero.
+	 */
+	public function netDue(): float {
+		return round( max( 0.0, $this->total() - $this->creditApplied ), 2 );
+	}
+
+	/**
+	 * Minimal payment info embedded in registration-creation responses: enough
+	 * for the front end to decide whether (and how) to run the payment step.
+	 *
+	 * @return array<string, mixed>
+	 */
+	public function toSummaryArray(): array {
+		return [
+			'id'     => $this->id,
+			'method' => $this->method,
+			'status' => $this->status,
+		];
+	}
+
 	/**
 	 * Returns a plain array representation of the payment.
 	 *
@@ -99,11 +142,17 @@ class Payment {
 			'tax_rate'          => $this->taxRate,
 			'tax_amount'        => $this->taxAmount,
 			'total'             => $this->total(),
+			'credit_applied'    => $this->creditApplied,
+			'net_due'           => $this->netDue(),
 			'currency'          => $this->currency,
 			'method'            => $this->method,
 			'status'            => $this->status,
+			'due_date'          => $this->dueDate,
+			'period_key'        => $this->periodKey,
+			'notice_batch'      => $this->noticeBatch,
 			'receipt_number'    => $this->receiptNumber,
 			'paid_at'           => $this->paidAt,
+			'created_at'        => $this->createdAt,
 		];
 	}
 }

src/Payment/PaymentController.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Payment;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class PaymentController {
 
@@ -19,10 +20,10 @@ class PaymentController {
 
 		if ( isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_payment_action' ) ) {
 			// phpcs:ignore WordPress.Security.NonceVerification.Missing -- nonce checked above.
-			if ( 'mark_paid' === sanitize_key( wp_unslash( $_POST['usc_action'] ?? '' ) ) ) {
+			if ( 'mark_paid' === sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ) ) ) ) {
 				// phpcs:disable WordPress.Security.NonceVerification.Missing
-				$paymentId = absint( $_POST['payment_id'] ?? 0 );
-				$email     = sanitize_email( wp_unslash( $_POST['etransfer_email'] ?? '' ) );
+				$paymentId = absint( Val::int( $_POST['payment_id'] ?? 0 ) );
+				$email     = sanitize_email( Val::string( wp_unslash( $_POST['etransfer_email'] ?? '' ) ) );
 				// phpcs:enable WordPress.Security.NonceVerification.Missing
 				if ( $paymentId > 0 ) {
 					// Record the destination it was actually sent to before confirming.
@@ -32,22 +33,61 @@ class PaymentController {
 			}
 		}
 
-		$rows = array_map(
-			static function ( Payment $payment ): array {
-				$student = get_userdata( $payment->studentId );
-
-				return [
-					'id'              => (int) $payment->id,
-					'student'         => $student ? $student->display_name : (string) $payment->studentId,
-					'amount'          => number_format( $payment->amount, 2 ) . ' ' . $payment->currency,
-					'method'          => $payment->method,
-					'for'             => $payment->registrationType . ' #' . $payment->registrationId,
-					'etransfer_email' => (string) $payment->etransferEmail,
-				];
-			},
-			$this->payments->findPending()
-		);
+		$groups = $this->groupPending( $this->payments->findPending() );
 
 		include USC_PLUGIN_DIR . 'templates/admin/payments.php';
 	}
+
+	/**
+	 * Group pending payments by their shared notice batch, so payments the daily
+	 * scan emailed a student together (and which a single lump-sum e-transfer
+	 * covers) are shown as one group with a combined total. Payments with no batch
+	 * — legacy at-registration e-transfers — are each their own single-item group.
+	 *
+	 * @param list<Payment> $pending
+	 * @return list<array{reference: string, is_group: bool, total: string, rows: list<array{id: int, student: string, amount: string, method: string, for: string, etransfer_email: string}>}>
+	 */
+	private function groupPending( array $pending ): array {
+		$groups = [];
+
+		foreach ( $pending as $payment ) {
+			$batch = (string) $payment->noticeBatch;
+			$key   = '' !== $batch ? 'b:' . $batch : 's:' . (string) $payment->id;
+
+			if ( ! isset( $groups[ $key ] ) ) {
+				$groups[ $key ] = [
+					'reference' => $batch,
+					'currency'  => $payment->currency,
+					'total_raw' => 0.0,
+					'rows'      => [],
+				];
+			}
+
+			$student = get_userdata( $payment->studentId );
+
+			// Show what the student still owes — the amount less any account credit
+			// already applied to this payment.
+			$groups[ $key ]['total_raw'] += $payment->netDue();
+			$groups[ $key ]['rows'][]     = [
+				'id'              => (int) $payment->id,
+				'student'         => $student ? $student->display_name : (string) $payment->studentId,
+				'amount'          => number_format( $payment->netDue(), 2 ) . ' ' . $payment->currency,
+				'method'          => $payment->method,
+				'for'             => $payment->registrationType . ' #' . $payment->registrationId,
+				'etransfer_email' => (string) $payment->etransferEmail,
+			];
+		}
+
+		return array_values(
+			array_map(
+				static fn( array $group ): array => [
+					'reference' => $group['reference'],
+					'is_group'  => count( $group['rows'] ) > 1,
+					'total'     => number_format( $group['total_raw'], 2 ) . ' ' . $group['currency'],
+					'rows'      => $group['rows'],
+				],
+				$groups
+			)
+		);
+	}
 }

src/Payment/PaymentDueMailer.php

@@ -0,0 +1,107 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Payment;
+
+/**
+ * Emails a student a single itemised notice for every payment the daily billing
+ * scan generated for them in one run, so a student billed for several lessons on
+ * the same day receives one email with a line per item and a grand total — never
+ * one email per lesson.
+ */
+class PaymentDueMailer {
+
+	/**
+	 * Send one student their consolidated due-payment notice for the current scan.
+	 * The optional `$reference` is the shared notice-batch code the student can quote
+	 * on a lump-sum e-transfer so the studio can reconcile it to these payments.
+	 *
+	 * @param list<array{label: string, amount: float, currency: string, due_date: ?string, etransfer_email: ?string}> $items
+	 * @param float                                                                                                    $creditApplied Account credit deducted from the total this notice covers.
+	 * @return bool False when there is no recipient or nothing to bill.
+	 */
+	public function send( \WP_User $student, array $items, string $reference = '', float $creditApplied = 0.0 ): bool {
+		if ( '' === (string) $student->user_email || [] === $items ) {
+			return false;
+		}
+
+		$currency = (string) $items[0]['currency'];
+		$total    = 0.0;
+		$lines    = [];
+		$emails   = [];
+
+		foreach ( $items as $item ) {
+			$amount = (float) $item['amount'];
+			$total += $amount;
+
+			$lines[] = sprintf(
+				/* translators: 1: item description, 2: due date, 3: currency, 4: amount */
+				__( '- %1$s (due %2$s): %3$s %4$s', 'unsupervised-schedular' ),
+				(string) $item['label'],
+				$this->formatDate( $item['due_date'] ?? null ),
+				$currency,
+				number_format( $amount, 2 )
+			);
+
+			$etransfer = (string) ( $item['etransfer_email'] ?? '' );
+			if ( '' !== $etransfer ) {
+				$emails[ $etransfer ] = true;
+			}
+		}
+
+		// Account credit (from an earlier cancelled paid lesson) offsets the total.
+		$creditApplied = round( min( $creditApplied, $total ), 2 );
+		$dueTotal      = round( $total - $creditApplied, 2 );
+
+		$body = __( 'You have upcoming payments due:', 'unsupervised-schedular' ) . "\n\n"
+			. implode( "\n", $lines );
+
+		if ( $creditApplied > 0.0 ) {
+			$body .= "\n\n" . sprintf(
+				/* translators: 1: currency, 2: credit amount */
+				__( 'Account credit applied: -%1$s %2$s', 'unsupervised-schedular' ),
+				$currency,
+				number_format( $creditApplied, 2 )
+			);
+		}
+
+		$body .= "\n\n" . sprintf(
+			/* translators: 1: currency, 2: total amount */
+			__( 'Total due: %1$s %2$s', 'unsupervised-schedular' ),
+			$currency,
+			number_format( $dueTotal, 2 )
+		);
+
+		if ( $dueTotal > 0.0 && [] !== $emails ) {
+			$body .= "\n\n" . sprintf(
+				/* translators: %s: e-transfer destination email address(es) */
+				__( 'Please send your e-transfer to: %s', 'unsupervised-schedular' ),
+				implode( ', ', array_keys( $emails ) )
+			);
+		}
+
+		if ( '' !== $reference ) {
+			$body .= "\n\n" . sprintf(
+				/* translators: %s: payment reference code */
+				__( 'Please include this reference with your payment: %s', 'unsupervised-schedular' ),
+				$reference
+			);
+		}
+
+		return (bool) wp_mail( $student->user_email, __( 'Payment due', 'unsupervised-schedular' ), $body );
+	}
+
+	/**
+	 * Present a stored `Y-m-d` due date in a friendlier form; falls back to the
+	 * raw value (or an empty string) when it is not a parseable date.
+	 */
+	private function formatDate( ?string $date ): string {
+		if ( null === $date || '' === $date ) {
+			return '';
+		}
+
+		$parsed = \DateTimeImmutable::createFromFormat( '!Y-m-d', $date );
+
+		return false !== $parsed ? $parsed->format( 'M j, Y' ) : $date;
+	}
+}

src/Payment/PaymentEndpoint.php

@@ -4,11 +4,17 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Payment;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class PaymentEndpoint {
 
 	public function __construct( private PaymentService $service ) {}
 
+	/**
+	 * Registers this endpoint's REST routes.
+	 *
+	 * @param non-falsy-string $route_namespace REST namespace the routes are registered under (e.g. `us-scheduler/v1`).
+	 */
 	public function registerRoutes( string $route_namespace ): void {
 		register_rest_route(
 			$route_namespace,
@@ -64,8 +70,8 @@ class PaymentEndpoint {
 	 * (Stripe client secret for card; display data for e-transfer/comp).
 	 */
 	public function createIntent( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$type           = (string) $request->get_param( 'registration_type' );
-		$registrationId = absint( $request->get_param( 'registration_id' ) );
+		$type           = Val::string( $request->get_param( 'registration_type' ) );
+		$registrationId = absint( Val::int( $request->get_param( 'registration_id' ) ) );
 
 		$result = $this->service->createIntent( $type, $registrationId, get_current_user_id() );
 		if ( null === $result ) {
@@ -99,7 +105,7 @@ class PaymentEndpoint {
 	 * Studio admin marks a pending payment (e-transfer) received.
 	 */
 	public function markPaid( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$id = absint( $request->get_param( 'id' ) );
+		$id = absint( Val::int( $request->get_param( 'id' ) ) );
 
 		if ( ! $this->service->markPaid( $id ) ) {
 			return new \WP_Error( 'not_found', __( 'Payment not found.', 'unsupervised-schedular' ), [ 'status' => 404 ] );

src/Payment/PaymentReport.php

@@ -90,13 +90,22 @@ class PaymentReport {
 	}
 
 	/**
-	 * Format one CSV record, quoting fields and escaping embedded quotes.
+	 * Format one CSV record, quoting fields and escaping embedded quotes. Fields
+	 * that a spreadsheet would interpret as a formula (leading =, +, -, @, tab, or
+	 * CR — e.g. a hostile student display name) are prefixed with an apostrophe so
+	 * they open as text, never as executable formulas.
 	 *
 	 * @param list<string> $fields
 	 */
 	private function csvLine( array $fields ): string {
 		$escaped = array_map(
-			static fn( string $field ): string => '"' . str_replace( '"', '""', $field ) . '"',
+			static function ( string $field ): string {
+				if ( 1 === preg_match( '/^[=+\-@\t\r]/', $field ) ) {
+					$field = "'" . $field;
+				}
+
+				return '"' . str_replace( '"', '""', $field ) . '"';
+			},
 			$fields
 		);
 

src/Payment/PaymentReportController.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Payment;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class PaymentReportController {
 
@@ -21,8 +22,8 @@ class PaymentReportController {
 		}
 
 		// phpcs:disable WordPress.Security.NonceVerification.Recommended -- read-only report filters, no state change.
-		$month        = $this->sanitizeMonth( isset( $_GET['month'] ) ? sanitize_text_field( wp_unslash( $_GET['month'] ) ) : '' );
-		$instructorId = isset( $_GET['instructor_id'] ) ? absint( $_GET['instructor_id'] ) : 0;
+		$month        = $this->sanitizeMonth( isset( $_GET['month'] ) ? sanitize_text_field( Val::string( wp_unslash( $_GET['month'] ) ) ) : '' );
+		$instructorId = isset( $_GET['instructor_id'] ) ? absint( Val::int( $_GET['instructor_id'] ) ) : 0;
 		// phpcs:enable WordPress.Security.NonceVerification.Recommended
 
 		$instructorId = $this->scopeInstructor( $instructorId );
@@ -58,8 +59,8 @@ class PaymentReportController {
 		check_admin_referer( self::EXPORT_ACTION );
 
 		// phpcs:disable WordPress.Security.NonceVerification.Recommended -- nonce checked above.
-		$month        = $this->sanitizeMonth( isset( $_GET['month'] ) ? sanitize_text_field( wp_unslash( $_GET['month'] ) ) : '' );
-		$instructorId = isset( $_GET['instructor_id'] ) ? absint( $_GET['instructor_id'] ) : 0;
+		$month        = $this->sanitizeMonth( isset( $_GET['month'] ) ? sanitize_text_field( Val::string( wp_unslash( $_GET['month'] ) ) ) : '' );
+		$instructorId = isset( $_GET['instructor_id'] ) ? absint( Val::int( $_GET['instructor_id'] ) ) : 0;
 		// phpcs:enable WordPress.Security.NonceVerification.Recommended
 
 		$instructorId = $this->scopeInstructor( $instructorId );
@@ -92,7 +93,8 @@ class PaymentReportController {
 	 */
 	private function buildReport( string $month, int $instructorId ): PaymentReport {
 		$start = $month . '-01 00:00:00';
-		$end   = gmdate( 'Y-m-d H:i:s', strtotime( $month . '-01 00:00:00 +1 month' ) );
+		$endTs = strtotime( $month . '-01 00:00:00 +1 month' );
+		$end   = false === $endTs ? $start : gmdate( 'Y-m-d H:i:s', $endTs );
 
 		$rows = array_map(
 			static function ( Payment $payment ): array {

src/Payment/PaymentRepository.php

@@ -25,6 +25,10 @@ class PaymentRepository {
 				'status'                   => $payment->status,
 				'tax_rate'                 => $payment->taxRate,
 				'tax_amount'               => $payment->taxAmount,
+				'credit_applied'           => $payment->creditApplied,
+				'due_date'                 => $payment->dueDate,
+				'period_key'               => $payment->periodKey,
+				'notice_batch'             => $payment->noticeBatch,
 				'etransfer_email'          => $payment->etransferEmail,
 				'stripe_payment_intent_id' => $payment->stripePaymentIntentId,
 				'receipt_number'           => $payment->receiptNumber,
@@ -32,7 +36,7 @@ class PaymentRepository {
 				'paid_at'                  => $payment->paidAt,
 				'created_at'               => current_time( 'mysql' ),
 			],
-			[ '%d', '%d', '%s', '%d', '%f', '%s', '%s', '%s', '%f', '%f', '%s', '%s', '%s', '%s', '%s', '%s' ]
+			[ '%d', '%d', '%s', '%d', '%f', '%s', '%s', '%s', '%f', '%f', '%f', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s' ]
 		);
 
 		return $this->db->insert_id;
@@ -55,7 +59,8 @@ class PaymentRepository {
 	public function findByStripeIntentId( string $intentId ): ?Payment {
 		$row = $this->db->get_row(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE stripe_payment_intent_id = %s ORDER BY id DESC LIMIT 1",
+				'SELECT * FROM %i WHERE stripe_payment_intent_id = %s ORDER BY id DESC LIMIT 1',
+				$this->table,
 				$intentId
 			)
 		);
@@ -73,18 +78,35 @@ class PaymentRepository {
 		);
 	}
 
+	/**
+	 * Add to the account credit applied against a payment, reducing what the student
+	 * still owes on it (`Payment::netDue()`). Accumulates, so a second application
+	 * adds to the first.
+	 */
+	public function addCreditApplied( int $id, float $amount ): bool {
+		$sql = $this->db->prepare(
+			'UPDATE %i SET credit_applied = credit_applied + %f WHERE id = %d',
+			$this->table,
+			$amount,
+			$id
+		);
+
+		return null !== $sql && false !== $this->db->query( $sql );
+	}
+
 	/**
 	 * Set a payment's tax rate and recompute the tax amount from its subtotal.
 	 */
 	public function updateTax( int $id, float $rate ): bool {
-		return false !== $this->db->query(
-			$this->db->prepare(
-				"UPDATE {$this->table} SET tax_rate = %f, tax_amount = ROUND( amount * %f / 100, 2 ) WHERE id = %d",
-				$rate,
-				$rate,
-				$id
-			)
+		$sql = $this->db->prepare(
+			'UPDATE %i SET tax_rate = %f, tax_amount = ROUND( amount * %f / 100, 2 ) WHERE id = %d',
+			$this->table,
+			$rate,
+			$rate,
+			$id
 		);
+
+		return null !== $sql && false !== $this->db->query( $sql );
 	}
 
 	/**
@@ -94,8 +116,8 @@ class PaymentRepository {
 	 * @return list<Payment>
 	 */
 	public function findPaidBetween( string $from, string $to, int $instructorId = 0 ): array {
-		$sql    = "SELECT * FROM {$this->table} WHERE status = %s AND paid_at >= %s AND paid_at < %s";
-		$params = [ Payment::STATUS_PAID, $from, $to ];
+		$sql    = 'SELECT * FROM %i WHERE status = %s AND paid_at >= %s AND paid_at < %s';
+		$params = [ $this->table, Payment::STATUS_PAID, $from, $to ];
 
 		if ( $instructorId > 0 ) {
 			$sql     .= ' AND instructor_id = %d';
@@ -111,16 +133,62 @@ class PaymentRepository {
 
 	public function findById( int $id ): ?Payment {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE id = %d", $id )
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
 		);
 
 		return $row ? Payment::fromRow( $row ) : null;
 	}
 
+	/**
+	 * Tag a set of payments with a shared notice-batch reference — the payments the
+	 * daily scan emailed a student together, so the admin can see which pending
+	 * payments a single lump-sum e-transfer covers. No-op for an empty id list.
+	 *
+	 * @param list<int> $ids
+	 */
+	public function assignNoticeBatch( array $ids, string $batch ): void {
+		if ( [] === $ids ) {
+			return;
+		}
+
+		$placeholders = implode( ', ', array_fill( 0, count( $ids ), '%d' ) );
+		$sql          = $this->db->prepare(
+			"UPDATE %i SET notice_batch = %s WHERE id IN ( {$placeholders} )",
+			$this->table,
+			$batch,
+			...$ids
+		);
+
+		if ( null !== $sql ) {
+			$this->db->query( $sql );
+		}
+	}
+
+	/**
+	 * Whether a scheduled payment already exists for a registration and billing
+	 * period. The daily billing scan uses this to avoid double-billing an
+	 * enrolment for the same session (weekly) or month (monthly). A voided
+	 * (`failed`) row still counts so a cancelled charge is not silently re-created.
+	 */
+	public function existsForPeriod( string $registrationType, int $registrationId, string $periodKey ): bool {
+		$found = $this->db->get_var(
+			$this->db->prepare(
+				'SELECT id FROM %i WHERE registration_type = %s AND registration_id = %d AND period_key = %s LIMIT 1',
+				$this->table,
+				$registrationType,
+				$registrationId,
+				$periodKey
+			)
+		);
+
+		return null !== $found;
+	}
+
 	public function findByRegistration( string $registrationType, int $registrationId ): ?Payment {
 		$row = $this->db->get_row(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE registration_type = %s AND registration_id = %d ORDER BY id DESC LIMIT 1",
+				'SELECT * FROM %i WHERE registration_type = %s AND registration_id = %d ORDER BY id DESC LIMIT 1',
+				$this->table,
 				$registrationType,
 				$registrationId
 			)
@@ -129,6 +197,23 @@ class PaymentRepository {
 		return $row ? Payment::fromRow( $row ) : null;
 	}
 
+	/**
+	 * Every payment for a student, newest first (admin payment history).
+	 *
+	 * @return list<Payment>
+	 */
+	public function findByStudent( int $studentId ): array {
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT * FROM %i WHERE student_id = %d ORDER BY created_at DESC, id DESC',
+				$this->table,
+				$studentId
+			)
+		);
+
+		return array_map( Payment::fromRow( ... ), $rows ?? [] );
+	}
+
 	/**
 	 * Pending payments, newest first (studio-admin confirmation queue).
 	 *
@@ -137,7 +222,8 @@ class PaymentRepository {
 	public function findPending(): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE status = %s ORDER BY created_at DESC",
+				'SELECT * FROM %i WHERE status = %s ORDER BY created_at DESC',
+				$this->table,
 				Payment::STATUS_PENDING
 			)
 		);

src/Payment/PaymentService.php

@@ -21,6 +21,7 @@ class PaymentService {
 		private EnrollmentRepository $enrollments,
 		private StudioSettings $settings,
 		private StripeGateway $stripe,
+		private CreditRepository $credits,
 	) {}
 
 	/**
@@ -29,8 +30,12 @@ class PaymentService {
 	 * (card via Stripe — coming soon; e-transfer confirmed manually). The
 	 * e-transfer destination is frozen now from the offering override or the studio
 	 * default. Returns null when the registration has no price to charge.
+	 *
+	 * A `$dueDate`/`$periodKey` mark a payment generated later by the daily billing
+	 * scan (weekly / monthly) rather than taken at registration; both stay null for
+	 * the pay-now flow.
 	 */
-	public function createForRegistration( string $type, int $registrationId, int $studentId, int $instructorId, float $amount, string $currency, ?string $offeringEtransferEmail = null ): ?Payment {
+	public function createForRegistration( string $type, int $registrationId, int $studentId, int $instructorId, float $amount, string $currency, ?string $offeringEtransferEmail = null, ?string $dueDate = null, ?string $periodKey = null ): ?Payment {
 		if ( $amount <= 0.0 ) {
 			return null;
 		}
@@ -58,6 +63,8 @@ class PaymentService {
 				status:           $status,
 				taxRate:          $taxRate,
 				taxAmount:        $taxAmount,
+				dueDate:          $dueDate,
+				periodKey:        $periodKey,
 				etransferEmail:   $etransferEmail,
 			)
 		);
@@ -71,6 +78,26 @@ class PaymentService {
 		return $this->payments->findById( $id );
 	}
 
+	/**
+	 * Whether a scheduled payment already exists for a registration and billing
+	 * period — the daily billing scan's dedup check for group enrolments (whose one
+	 * row maps to many periodic charges). Delegates to the ledger.
+	 */
+	public function scheduledPaymentExists( string $type, int $registrationId, string $periodKey ): bool {
+		return $this->payments->existsForPeriod( $type, $registrationId, $periodKey );
+	}
+
+	/**
+	 * Tag the payments the daily scan emailed a student together with a shared
+	 * notice-batch reference, so a lump-sum e-transfer can be reconciled to the
+	 * pending payments it covers. Delegates to the ledger.
+	 *
+	 * @param list<int> $ids
+	 */
+	public function assignNoticeBatch( array $ids, string $batch ): void {
+		$this->payments->assignNoticeBatch( $ids, $batch );
+	}
+
 	/**
 	 * Studio-admin confirmation that a pending payment (e-transfer) was received.
 	 * Marks it paid, confirms the registration, and emails the receipt.
@@ -89,6 +116,154 @@ class PaymentService {
 		return true;
 	}
 
+	/**
+	 * Void the still-pending payment of a cancelled registration so it drops
+	 * out of the confirmation queue. Paid payments are left alone — refunds
+	 * are a manual, admin-side decision. Scheduled payments (weekly / monthly)
+	 * are also left alone: a monthly charge can cover several lessons and may
+	 * already be collected, so cancelling one lesson must never void it or
+	 * trigger a rebill.
+	 */
+	public function voidPending( ?int $paymentId ): void {
+		if ( null === $paymentId ) {
+			return;
+		}
+
+		$payment = $this->payments->findById( $paymentId );
+		if ( null !== $payment && ! $payment->isScheduled() && Payment::STATUS_PENDING === $payment->status ) {
+			$this->payments->updateStatus( $paymentId, Payment::STATUS_FAILED );
+		}
+	}
+
+	/**
+	 * Credit a student for a cancelled lesson they had already paid for. The credit
+	 * is one lesson's share of the covering payment's total (including tax) — the
+	 * whole total for a single-lesson payment, or `total ÷ lessons covered` for a
+	 * payment that spans several (a monthly scheduled charge, or a weekly series paid
+	 * upfront). The original payment is left untouched; the credit is applied to the
+	 * student's future scheduled-billing charges. Returns null when the lesson was
+	 * never paid, has no covering payment, or was already credited.
+	 */
+	public function creditForCancelledLesson( Lesson $lesson ): ?Credit {
+		if ( null === $lesson->id ) {
+			return null;
+		}
+
+		$paymentId = $lesson->paymentId;
+		if ( null === $paymentId && null !== $lesson->seriesId ) {
+			// Series lessons other than the anchor carry no payment_id of their own;
+			// the whole reservation is paid through the anchor's payment.
+			$anchor    = $this->payments->findByRegistration( Payment::REG_LESSON, $lesson->seriesId );
+			$paymentId = $anchor?->id;
+		}
+		if ( null === $paymentId ) {
+			return null;
+		}
+
+		$payment = $this->payments->findById( $paymentId );
+		if ( null === $payment || ! $payment->isPaid() ) {
+			return null;
+		}
+
+		if ( $this->credits->existsForLesson( $lesson->id ) ) {
+			return null;
+		}
+
+		$share = round( $payment->total() / $this->coveredLessonCount( $lesson, $payment ), 2 );
+		if ( $share <= 0.0 ) {
+			return null;
+		}
+
+		$id = $this->credits->insert(
+			new Credit(
+				studentId:       $payment->studentId,
+				amount:          $share,
+				remaining:       $share,
+				currency:        $payment->currency,
+				sourcePaymentId: $payment->id,
+				sourceLessonId:  $lesson->id,
+				reason:          sprintf(
+					/* translators: %d: cancelled lesson id */
+					__( 'Credit for cancelled lesson #%d', 'unsupervised-schedular' ),
+					$lesson->id
+				),
+			)
+		);
+
+		return $this->credits->findById( $id );
+	}
+
+	/**
+	 * How many lessons the covering payment was billed for, so its total can be split
+	 * into a per-lesson credit. A weekly series paid upfront (unscheduled) covers the
+	 * whole series; every other case — a single booking, a weekly scheduled lesson
+	 * (one payment each), or a monthly scheduled charge (payment linked to each
+	 * lesson) — is answered by how many lessons point at the payment. Never below one.
+	 */
+	private function coveredLessonCount( Lesson $lesson, Payment $payment ): int {
+		if ( ! $payment->isScheduled() && null !== $lesson->seriesId ) {
+			return max( 1, $this->bookings->countBySeries( $lesson->seriesId ) );
+		}
+
+		return max( 1, $this->bookings->countByPaymentId( (int) $payment->id ) );
+	}
+
+	/**
+	 * Apply a student's available credit balance against a set of freshly-created
+	 * pending payments (the ones a billing scan just generated for them), oldest
+	 * charge first. Each payment's `credit_applied` is raised by the amount covered;
+	 * a payment fully covered is marked paid-by-credit and its registration confirmed
+	 * so it leaves the confirmation queue. The credit ledger is drawn down by the
+	 * total applied. Returns a map of payment id to the credit applied to it, so the
+	 * caller can reflect the reduction on the student's notice.
+	 *
+	 * @param list<Payment> $payments
+	 * @return array<int, float>
+	 */
+	public function applyCredits( int $studentId, array $payments ): array {
+		$balance = $this->credits->availableBalance( $studentId );
+		if ( $balance <= 0.0 ) {
+			return [];
+		}
+
+		$applied  = [];
+		$consumed = 0.0;
+
+		foreach ( $payments as $payment ) {
+			if ( null === $payment->id || $balance <= 0.0 ) {
+				continue;
+			}
+
+			$owing = $payment->netDue();
+			if ( $owing <= 0.0 ) {
+				continue;
+			}
+
+			$amount = round( min( $balance, $owing ), 2 );
+			if ( $amount <= 0.0 ) {
+				continue;
+			}
+
+			$this->payments->addCreditApplied( $payment->id, $amount );
+
+			// Fully covered by credit: settle it so it drops out of the pending queue.
+			if ( $amount >= $owing ) {
+				$this->payments->markPaid( $payment->id, 'USC-' . $payment->id );
+				$this->confirmRegistration( $payment->registrationType, $payment->registrationId );
+			}
+
+			$applied[ $payment->id ] = $amount;
+			$balance                 = round( $balance - $amount, 2 );
+			$consumed                = round( $consumed + $amount, 2 );
+		}
+
+		if ( $consumed > 0.0 ) {
+			$this->credits->consume( $studentId, $consumed );
+		}
+
+		return $applied;
+	}
+
 	/**
 	 * Resolve the client-side payment step for a freshly created registration.
 	 * For a card payment a Stripe PaymentIntent is created (or replayed
@@ -179,10 +354,20 @@ class PaymentService {
 	}
 
 	private function confirmRegistration( string $type, int $registrationId ): void {
-		if ( Payment::REG_LESSON === $type ) {
-			$this->bookings->updateStatus( $registrationId, Lesson::STATUS_CONFIRMED );
+		if ( Payment::REG_LESSON !== $type ) {
+			// Group enrolments are already `active`; no status change on payment.
+			return;
 		}
-		// Group enrolments are already `active`; no status change on payment.
+
+		// A weekly reservation's payment is linked to its anchor lesson but pays
+		// for the whole series, so settling it confirms every lesson in the series.
+		$lesson = $this->bookings->findById( $registrationId );
+		if ( null !== $lesson && null !== $lesson->seriesId ) {
+			$this->bookings->updateStatusForSeries( $lesson->seriesId, Lesson::STATUS_CONFIRMED );
+			return;
+		}
+
+		$this->bookings->updateStatus( $registrationId, Lesson::STATUS_CONFIRMED );
 	}
 
 	private function linkPayment( string $type, int $registrationId, int $paymentId ): void {

src/Payment/ScheduledBillingRunner.php

@@ -0,0 +1,389 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Payment;
+
+use Unsupervised\Schedular\Booking\BookingRepository;
+use Unsupervised\Schedular\GroupClass\Enrollment;
+use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
+use Unsupervised\Schedular\Offering\Offering;
+use Unsupervised\Schedular\Offering\OfferingRepository;
+use Unsupervised\Schedular\Val;
+
+/**
+ * Generates the pending payments that scheduled-billing offerings (weekly /
+ * monthly) owe as they come due, then emails each student one itemised notice.
+ *
+ * Runs from the daily WP-Cron action `us_generate_due_payments`. It is
+ * self-healing: every run re-scans from the current ledger state, so a missed
+ * day is simply picked up the next time. Dedup keeps a second run from
+ * double-billing — private lessons via `us_lessons.payment_id`, group enrolments
+ * via `us_payments.period_key`.
+ */
+class ScheduledBillingRunner {
+
+	public const HOOK = 'us_generate_due_payments';
+
+	public function __construct(
+		private PaymentService $payments,
+		private BookingRepository $bookings,
+		private EnrollmentRepository $enrollments,
+		private OfferingRepository $offerings,
+		private PaymentDueMailer $mailer,
+	) {}
+
+	public function register(): void {
+		add_action( self::HOOK, [ $this, 'run' ] );
+	}
+
+	/**
+	 * Generate every payment now due and send the consolidated notices.
+	 */
+	public function run(): void {
+		$now = $this->now();
+
+		// One notice bucket per student, filled as pending payments are created and
+		// flushed to a single email at the end, so a student billed for several
+		// lessons on one day is emailed once — never once per lesson. Each entry keeps
+		// the created payment and its label; credits are applied across the whole
+		// bucket before the notice is built, so a student's account credit offsets the
+		// run's charges oldest-first.
+		$buckets = [];
+
+		$this->billPrivateLessons( $now, $buckets );
+		$this->billGroupEnrollments( $now, $buckets );
+
+		$this->sendNotices( $buckets );
+	}
+
+	/**
+	 * Private-lesson billing. Weekly lessons are billed one payment each once they
+	 * are within 24 hours; monthly lessons are grouped per calendar month and billed
+	 * one payment for the month once its 1st has arrived.
+	 *
+	 * @param array<int, list<array{payment: Payment, label: string}>> $buckets
+	 */
+	private function billPrivateLessons( \DateTimeImmutable $now, array &$buckets ): void {
+		$today   = $now->format( 'Y-m-d' );
+		$monthly = [];
+
+		foreach ( $this->bookings->findUnbilledScheduledLessons() as $row ) {
+			$price = Val::float( $row->price ?? 0 );
+			if ( $price <= 0.0 ) {
+				continue;
+			}
+
+			$startRaw = Val::string( $row->start_dt ?? '' );
+			$start    = false !== strtotime( $startRaw ) ? new \DateTimeImmutable( $startRaw ) : null;
+			if ( null === $start ) {
+				continue;
+			}
+
+			$lessonId     = Val::int( $row->id );
+			$studentId    = Val::int( $row->student_id );
+			$instructorId = Val::int( $row->instructor_id );
+			$currency     = Val::string( $row->currency ?? 'CAD' );
+			$etransfer    = Val::stringOrNull( $row->etransfer_email ?? null );
+			$title        = Val::string( $row->title ?? '' );
+
+			if ( Offering::BILLING_MONTHLY === Val::string( $row->billing_mode ?? '' ) ) {
+				$monthly[ $studentId . ':' . Val::int( $row->offering_id ) . ':' . $start->format( 'Y-m' ) ][] = [
+					'lesson_id'     => $lessonId,
+					'student_id'    => $studentId,
+					'instructor_id' => $instructorId,
+					'currency'      => $currency,
+					'etransfer'     => $etransfer,
+					'title'         => $title,
+					'price'         => $price,
+					'start'         => $start,
+				];
+				continue;
+			}
+
+			// Weekly: due 24 hours before the lesson.
+			$due = $start->modify( '-1 day' );
+			if ( $due->format( 'Y-m-d H:i:s' ) > $now->format( 'Y-m-d H:i:s' ) ) {
+				continue;
+			}
+
+			$this->bill(
+				$buckets,
+				Payment::REG_LESSON,
+				$lessonId,
+				$studentId,
+				$instructorId,
+				$price,
+				$currency,
+				$etransfer,
+				$due->format( 'Y-m-d' ),
+				$start->format( 'Y-m-d' ),
+				$title . ' — ' . $start->format( 'M j, Y' )
+			);
+		}
+
+		$this->billMonthlyLessonGroups( $today, $monthly, $buckets );
+	}
+
+	/**
+	 * Bill each month's worth of monthly private lessons as one payment (count ×
+	 * fee), once the month's 1st has arrived. The payment links to the earliest
+	 * lesson in the group; the rest are pointed at it so they are not re-billed.
+	 *
+	 * @param array<string, list<array{lesson_id: int, student_id: int, instructor_id: int, currency: string, etransfer: ?string, title: string, price: float, start: \DateTimeImmutable}>> $monthly
+	 * @param array<int, list<array{payment: Payment, label: string}>> $buckets
+	 */
+	private function billMonthlyLessonGroups( string $today, array $monthly, array &$buckets ): void {
+		foreach ( $monthly as $group ) {
+			$first      = $group[0]['start'];
+			$monthStart = $first->format( 'Y-m-01' );
+
+			// Not billable until the 1st of the lesson's month has arrived.
+			if ( $monthStart > $today ) {
+				continue;
+			}
+
+			$lessonIds = array_map( static fn( array $l ): int => $l['lesson_id'], $group );
+			$anchorId  = $lessonIds[0];
+			$count     = count( $group );
+
+			$payment = $this->bill(
+				$buckets,
+				Payment::REG_LESSON,
+				$anchorId,
+				$group[0]['student_id'],
+				$group[0]['instructor_id'],
+				$group[0]['price'] * $count,
+				$group[0]['currency'],
+				$group[0]['etransfer'],
+				$monthStart,
+				$first->format( 'Y-m' ),
+				sprintf(
+					/* translators: 1: offering title, 2: month, 3: number of lessons */
+					_n( '%1$s (%2$s): %3$d lesson', '%1$s (%2$s): %3$d lessons', $count, 'unsupervised-schedular' ),
+					$group[0]['title'],
+					$first->format( 'F Y' ),
+					$count
+				)
+			);
+
+			if ( null === $payment ) {
+				continue;
+			}
+
+			// createForRegistration links the anchor; point the rest of the month at
+			// the same payment so the next scan sees them as billed.
+			foreach ( array_slice( $lessonIds, 1 ) as $extraId ) {
+				$this->bookings->setPaymentId( $extraId, (int) $payment->id );
+			}
+		}
+	}
+
+	/**
+	 * Group-class billing off each active enrolment's concrete session windows.
+	 * Weekly bills one payment per session (24h before); monthly bills one payment
+	 * per month (on the 1st) for that month's sessions. Dedup is by `period_key`
+	 * since a single enrolment maps to many periodic charges.
+	 *
+	 * @param array<int, list<array{payment: Payment, label: string}>> $buckets
+	 */
+	private function billGroupEnrollments( \DateTimeImmutable $now, array &$buckets ): void {
+		$today     = $now->format( 'Y-m-d' );
+		$offerings = [];
+
+		foreach ( $this->enrollments->findActiveByBillingModes( Offering::SCHEDULED_BILLING_MODES ) as $enrollment ) {
+			$offeringId = $enrollment->offeringId;
+			if ( ! array_key_exists( $offeringId, $offerings ) ) {
+				$offerings[ $offeringId ] = $this->offerings->findById( $offeringId );
+			}
+			$offering = $offerings[ $offeringId ];
+			if ( null === $offering || $offering->price <= 0.0 ) {
+				continue;
+			}
+
+			$windows = $offering->sessionWindows();
+			if ( [] === $windows ) {
+				continue;
+			}
+
+			if ( Offering::BILLING_MONTHLY === $offering->billingMode ) {
+				$this->billGroupMonthly( $now, $today, $enrollment, $offering, $windows, $buckets );
+			} else {
+				$this->billGroupWeekly( $now, $enrollment, $offering, $windows, $buckets );
+			}
+		}
+	}
+
+	/**
+	 * Bill one payment per group-class session that is now within 24 hours.
+	 *
+	 * @param list<array{start: string, end: string}> $windows
+	 * @param array<int, list<array{payment: Payment, label: string}>> $buckets
+	 */
+	private function billGroupWeekly( \DateTimeImmutable $now, Enrollment $enrollment, Offering $offering, array $windows, array &$buckets ): void {
+		foreach ( $windows as $window ) {
+			$start = new \DateTimeImmutable( $window['start'] );
+			$due   = $start->modify( '-1 day' );
+			if ( $due->format( 'Y-m-d H:i:s' ) > $now->format( 'Y-m-d H:i:s' ) ) {
+				continue;
+			}
+
+			$periodKey = $start->format( 'Y-m-d' );
+			if ( $this->payments->scheduledPaymentExists( Payment::REG_ENROLLMENT, (int) $enrollment->id, $periodKey ) ) {
+				continue;
+			}
+
+			$this->bill(
+				$buckets,
+				Payment::REG_ENROLLMENT,
+				(int) $enrollment->id,
+				$enrollment->studentId,
+				$enrollment->instructorId,
+				$offering->price,
+				$offering->currency,
+				$offering->etransferEmail,
+				$due->format( 'Y-m-d' ),
+				$periodKey,
+				$offering->title . ' — ' . $start->format( 'M j, Y' )
+			);
+		}
+	}
+
+	/**
+	 * Bill one payment per calendar month of a group class, once its 1st arrives.
+	 *
+	 * A monthly group class is priced **per month**, not per session: the fee is
+	 * charged once for the month however many times the class meets in it. This is
+	 * what the student is quoted and agrees to on the way in ("40.00 CAD monthly"),
+	 * and it is the one place the monthly rule differs from private lessons, whose
+	 * per-lesson fee is multiplied by the lessons that fall in the month.
+	 *
+	 * @param list<array{start: string, end: string}> $windows
+	 * @param array<int, list<array{payment: Payment, label: string}>> $buckets
+	 */
+	private function billGroupMonthly( \DateTimeImmutable $now, string $today, Enrollment $enrollment, Offering $offering, array $windows, array &$buckets ): void { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.Found
+		// Count this enrolment's sessions per calendar month. The count does not
+		// price the month — it names it on the student's notice ("3 sessions").
+		$months = [];
+		foreach ( $windows as $window ) {
+			$start                             = new \DateTimeImmutable( $window['start'] );
+			$months[ $start->format( 'Y-m' ) ] = ( $months[ $start->format( 'Y-m' ) ] ?? 0 ) + 1;
+		}
+
+		foreach ( $months as $month => $count ) {
+			$monthStart = ( new \DateTimeImmutable( $month . '-01' ) )->format( 'Y-m-d' );
+			if ( $monthStart > $today ) {
+				continue;
+			}
+
+			if ( $this->payments->scheduledPaymentExists( Payment::REG_ENROLLMENT, (int) $enrollment->id, $month ) ) {
+				continue;
+			}
+
+			$this->bill(
+				$buckets,
+				Payment::REG_ENROLLMENT,
+				(int) $enrollment->id,
+				$enrollment->studentId,
+				$enrollment->instructorId,
+				$offering->price,
+				$offering->currency,
+				$offering->etransferEmail,
+				$monthStart,
+				$month,
+				sprintf(
+					/* translators: 1: offering title, 2: month, 3: number of sessions */
+					_n( '%1$s (%2$s): %3$d session', '%1$s (%2$s): %3$d sessions', $count, 'unsupervised-schedular' ),
+					$offering->title,
+					( new \DateTimeImmutable( $month . '-01' ) )->format( 'F Y' ),
+					$count
+				)
+			);
+		}
+	}
+
+	/**
+	 * Create one scheduled payment and, when it is pending (not a comp auto-pay),
+	 * add it to the student's notice bucket with the label to show on the notice.
+	 * Credits are applied later, once the whole bucket is known. Returns the created
+	 * payment, or null when there was nothing to charge.
+	 *
+	 * @param array<int, list<array{payment: Payment, label: string}>> $buckets
+	 */
+	private function bill( array &$buckets, string $type, int $registrationId, int $studentId, int $instructorId, float $amount, string $currency, ?string $etransferEmail, string $dueDate, string $periodKey, string $label ): ?Payment {
+		$payment = $this->payments->createForRegistration( $type, $registrationId, $studentId, $instructorId, $amount, $currency, $etransferEmail, $dueDate, $periodKey );
+
+		if ( null !== $payment && null !== $payment->id && Payment::STATUS_PENDING === $payment->status ) {
+			$buckets[ $studentId ][] = [
+				'payment' => $payment,
+				'label'   => $label,
+			];
+		}
+
+		return $payment;
+	}
+
+	/**
+	 * For each student, apply any account credit they hold against the run's charges,
+	 * tag the payments they still owe with a shared batch reference, and email them
+	 * one itemised notice. The notice lists each charge at its full amount, then the
+	 * credit applied and the reduced total due; a charge fully covered by credit is
+	 * already settled and carries no reference. A lump-sum e-transfer for the balance
+	 * reconciles to the reference.
+	 *
+	 * @param array<int, list<array{payment: Payment, label: string}>> $buckets
+	 */
+	private function sendNotices( array $buckets ): void {
+		foreach ( $buckets as $studentId => $entries ) {
+			$payments = array_map( static fn( array $entry ): Payment => $entry['payment'], $entries );
+			$applied  = $this->payments->applyCredits( $studentId, $payments );
+
+			$items       = [];
+			$batchIds    = [];
+			$creditTotal = 0.0;
+
+			foreach ( $entries as $entry ) {
+				$payment  = $entry['payment'];
+				$id       = (int) $payment->id;
+				$credited = $applied[ $id ] ?? 0.0;
+
+				$creditTotal += $credited;
+
+				$items[] = [
+					'label'           => $entry['label'],
+					'amount'          => $payment->total(),
+					'currency'        => $payment->currency,
+					'due_date'        => $payment->dueDate,
+					'etransfer_email' => $payment->etransferEmail,
+				];
+
+				// A charge still carrying a balance is what a lump-sum e-transfer covers;
+				// one fully settled by credit needs no reconciliation reference.
+				if ( round( $payment->total() - $credited, 2 ) > 0.0 ) {
+					$batchIds[] = $id;
+				}
+			}
+
+			$reference = [] !== $batchIds ? $this->reference() : '';
+			$this->payments->assignNoticeBatch( $batchIds, $reference );
+
+			$user = get_userdata( $studentId );
+			if ( $user instanceof \WP_User ) {
+				$this->mailer->send( $user, $items, $reference, round( $creditTotal, 2 ) );
+			}
+		}
+	}
+
+	/**
+	 * A short, human-quotable reference shared by every payment in one student's
+	 * notice, printed on the email and shown in the admin payments queue.
+	 */
+	private function reference(): string {
+		return strtoupper( substr( str_replace( '-', '', Val::string( wp_generate_uuid4() ) ), 0, 10 ) );
+	}
+
+	private function now(): \DateTimeImmutable {
+		$mysql = Val::string( current_time( 'mysql' ) );
+
+		return false !== strtotime( $mysql ) ? new \DateTimeImmutable( $mysql ) : new \DateTimeImmutable();
+	}
+}

src/Payment/StripeGateway.php

@@ -67,8 +67,8 @@ class StripeGateway {
 	 * Seam around the Stripe PaymentIntents create call so tests can stub the
 	 * network request.
 	 *
-	 * @param array<string, mixed> $params
-	 * @param array<string, mixed> $options
+	 * @param array{amount: int, currency: string, metadata: array<string, string>, description: string} $params
+	 * @param array{idempotency_key?: string} $options
 	 */
 	protected function paymentIntentsCreate( array $params, array $options ): PaymentIntent {
 		return $this->client()->paymentIntents->create( $params, $options );

src/Payment/StudioSettings.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Payment;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class StudioSettings {
 
@@ -15,12 +16,32 @@ class StudioSettings {
 	public const OPT_ETRANSFER_EMAIL = 'us_etransfer_email';
 	public const OPT_HST_RATE        = 'us_hst_rate';
 
+	/**
+	 * Studio-default cancellation cutoff, stored in hours. A student may not
+	 * cancel a lesson once it starts within this many hours. Displayed to the
+	 * admin in days; an offering may override it with its own hour value.
+	 */
+	public const OPT_CANCELLATION_CUTOFF_HOURS     = 'us_cancellation_cutoff_hours';
+	public const DEFAULT_CANCELLATION_CUTOFF_HOURS = 24;
+
+	public const OPT_REGISTRATION_MODE = 'us_registration_mode';
+	public const MODE_INVITE           = 'invite';
+	public const MODE_SELF_APPROVAL    = 'self_approval';
+
+	/**
+	 * Snapshots of the two core WordPress options this feature takes over while
+	 * open registration is enabled, so disabling restores them exactly rather
+	 * than clobbering a site that set them for its own reasons.
+	 */
+	public const OPT_PREV_USERS_CAN_REGISTER = 'us_registration_prev_can_register';
+	public const OPT_PREV_DEFAULT_ROLE       = 'us_registration_prev_default_role';
+
 	public function publishableKey(): string {
-		return (string) get_option( self::OPT_PUBLISHABLE, '' );
+		return Val::string( get_option( self::OPT_PUBLISHABLE, '' ) );
 	}
 
 	public function secretKey(): string {
-		return (string) get_option( self::OPT_SECRET, '' );
+		return Val::string( get_option( self::OPT_SECRET, '' ) );
 	}
 
 	/**
@@ -28,7 +49,7 @@ class StudioSettings {
 	 * webhook requests genuinely came from Stripe. Empty until configured.
 	 */
 	public function webhookSecret(): string {
-		return (string) get_option( self::OPT_WEBHOOK_SECRET, '' );
+		return Val::string( get_option( self::OPT_WEBHOOK_SECRET, '' ) );
 	}
 
 	public function mode(): string {
@@ -36,7 +57,7 @@ class StudioSettings {
 	}
 
 	public function currency(): string {
-		$currency = (string) get_option( self::OPT_CURRENCY, 'CAD' );
+		$currency = Val::string( get_option( self::OPT_CURRENCY, 'CAD' ) );
 
 		return '' !== $currency ? strtoupper( $currency ) : 'CAD';
 	}
@@ -46,14 +67,23 @@ class StudioSettings {
 	 * no override).
 	 */
 	public function etransferEmail(): string {
-		return (string) get_option( self::OPT_ETRANSFER_EMAIL, '' );
+		return Val::string( get_option( self::OPT_ETRANSFER_EMAIL, '' ) );
 	}
 
 	/**
 	 * Default HST/tax rate as a percentage (e.g. 13.0). 0 means no tax.
 	 */
 	public function hstRate(): float {
-		return max( 0.0, (float) get_option( self::OPT_HST_RATE, 0 ) );
+		return max( 0.0, Val::float( get_option( self::OPT_HST_RATE, 0 ) ) );
+	}
+
+	/**
+	 * The studio-default cancellation cutoff in hours: a student cannot cancel a
+	 * lesson once it starts within this window. 0 means students may cancel any
+	 * time. Offerings without their own override inherit this value.
+	 */
+	public function cancellationCutoffHours(): int {
+		return max( 0, Val::int( get_option( self::OPT_CANCELLATION_CUTOFF_HOURS, self::DEFAULT_CANCELLATION_CUTOFF_HOURS ) ) );
 	}
 
 	/**
@@ -64,6 +94,24 @@ class StudioSettings {
 		return '' !== $this->publishableKey() && '' !== $this->secretKey();
 	}
 
+	/**
+	 * Which student registration mode is active: `invite` (default) — only a
+	 * valid invite token grants the registration form — or `self_approval` —
+	 * anyone may sign up, confirm their email, and await studio approval.
+	 */
+	public function registrationMode(): string {
+		return self::MODE_SELF_APPROVAL === get_option( self::OPT_REGISTRATION_MODE, self::MODE_INVITE )
+			? self::MODE_SELF_APPROVAL
+			: self::MODE_INVITE;
+	}
+
+	/**
+	 * Whether anyone may self-register (the `self_approval` mode).
+	 */
+	public function openRegistrationEnabled(): bool {
+		return self::MODE_SELF_APPROVAL === $this->registrationMode();
+	}
+
 	public function renderPage(): void {
 		if ( ! current_user_can( RoleManager::CAP_MANAGE_BILLING ) ) {
 			wp_die( esc_html__( 'You do not have permission to manage billing settings.', 'unsupervised-schedular' ) );
@@ -85,6 +133,9 @@ class StudioSettings {
 		$etransferEmail   = $this->etransferEmail();
 		$hstRate          = $this->hstRate();
 		$stripeConfigured = $this->isStripeConfigured();
+		$openRegistration = $this->openRegistrationEnabled();
+		// Stored in hours, surfaced to the admin in whole days.
+		$cancellationCutoffDays = (int) round( $this->cancellationCutoffHours() / 24 );
 
 		include USC_PLUGIN_DIR . 'templates/admin/settings.php';
 	}
@@ -92,23 +143,66 @@ class StudioSettings {
 	private function save(): void {
 		// Nonce is verified by the caller (renderPage) before this method runs.
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$mode = sanitize_key( wp_unslash( $_POST['mode'] ?? 'test' ) );
-		update_option( self::OPT_PUBLISHABLE, sanitize_text_field( wp_unslash( $_POST['publishable_key'] ?? '' ) ) );
+		$mode = sanitize_key( Val::string( wp_unslash( $_POST['mode'] ?? 'test' ) ) );
+		update_option( self::OPT_PUBLISHABLE, sanitize_text_field( Val::string( wp_unslash( $_POST['publishable_key'] ?? '' ) ) ) );
 		// Secret fields are write-only: a blank submission keeps the stored secret,
 		// so an admin saving other settings never wipes the keys.
-		$secretKey = sanitize_text_field( wp_unslash( $_POST['secret_key'] ?? '' ) );
+		$secretKey = sanitize_text_field( Val::string( wp_unslash( $_POST['secret_key'] ?? '' ) ) );
 		if ( '' !== $secretKey ) {
 			update_option( self::OPT_SECRET, $secretKey );
 		}
-		$webhookSecret = sanitize_text_field( wp_unslash( $_POST['webhook_secret'] ?? '' ) );
+		$webhookSecret = sanitize_text_field( Val::string( wp_unslash( $_POST['webhook_secret'] ?? '' ) ) );
 		if ( '' !== $webhookSecret ) {
 			update_option( self::OPT_WEBHOOK_SECRET, $webhookSecret );
 		}
 		update_option( self::OPT_MODE, 'live' === $mode ? 'live' : 'test' );
-		update_option( self::OPT_CURRENCY, strtoupper( sanitize_text_field( wp_unslash( $_POST['currency'] ?? 'CAD' ) ) ) );
-		update_option( self::OPT_ETRANSFER_EMAIL, sanitize_email( wp_unslash( $_POST['etransfer_email'] ?? '' ) ) );
-		$hstRate = isset( $_POST['hst_rate'] ) ? (float) $_POST['hst_rate'] : 0.0;
+		update_option( self::OPT_CURRENCY, strtoupper( sanitize_text_field( Val::string( wp_unslash( $_POST['currency'] ?? 'CAD' ) ) ) ) );
+		update_option( self::OPT_ETRANSFER_EMAIL, sanitize_email( Val::string( wp_unslash( $_POST['etransfer_email'] ?? '' ) ) ) );
+		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Val::float() coerces to float; slashes cannot survive numeric coercion.
+		$hstRate = isset( $_POST['hst_rate'] ) ? Val::float( $_POST['hst_rate'] ) : 0.0;
 		update_option( self::OPT_HST_RATE, max( 0.0, $hstRate ) );
+
+		// The cutoff is entered in whole days but stored in hours.
+		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- Val::int() coerces to int; slashes cannot survive numeric coercion.
+		$cutoffDays = isset( $_POST['cancellation_cutoff_days'] ) ? max( 0, Val::int( $_POST['cancellation_cutoff_days'] ) ) : 0;
+		update_option( self::OPT_CANCELLATION_CUTOFF_HOURS, $cutoffDays * 24 );
+
+		$this->applyRegistrationMode( isset( $_POST['open_registration'] ) );
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
 	}
+
+	/**
+	 * Enable or disable open (self-approval) registration, mirroring the change
+	 * into the two core WordPress options it depends on.
+	 *
+	 * Enabling snapshots the current `users_can_register` and `default_role`,
+	 * then turns registration on and makes Student the default new-user role.
+	 * Disabling restores that snapshot, so this toggle never permanently
+	 * overwrites a site's own membership settings. Only transitions act, so
+	 * saving unrelated settings leaves the core options untouched.
+	 */
+	private function applyRegistrationMode( bool $enable ): void {
+		$currentlyOpen = $this->openRegistrationEnabled();
+
+		if ( $enable && ! $currentlyOpen ) {
+			update_option( self::OPT_PREV_USERS_CAN_REGISTER, get_option( 'users_can_register' ) ? '1' : '0' );
+			update_option( self::OPT_PREV_DEFAULT_ROLE, Val::string( get_option( 'default_role', 'subscriber' ) ) );
+
+			update_option( 'users_can_register', '1' );
+			update_option( 'default_role', RoleManager::STUDENT );
+			update_option( self::OPT_REGISTRATION_MODE, self::MODE_SELF_APPROVAL );
+			return;
+		}
+
+		if ( ! $enable && $currentlyOpen ) {
+			$prevCanRegister = '1' === Val::string( get_option( self::OPT_PREV_USERS_CAN_REGISTER, '0' ) );
+			$prevRole        = Val::string( get_option( self::OPT_PREV_DEFAULT_ROLE, 'subscriber' ) );
+
+			update_option( 'users_can_register', $prevCanRegister ? '1' : '0' );
+			update_option( 'default_role', '' !== $prevRole ? $prevRole : 'subscriber' );
+			delete_option( self::OPT_PREV_USERS_CAN_REGISTER );
+			delete_option( self::OPT_PREV_DEFAULT_ROLE );
+			update_option( self::OPT_REGISTRATION_MODE, self::MODE_INVITE );
+		}
+	}
 }

src/Plugin.php

@@ -3,16 +3,28 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular;
 
+use Unsupervised\Schedular\Auth\EmailConfirmationHandler;
 use Unsupervised\Schedular\Auth\InviteRepository;
+use Unsupervised\Schedular\Auth\LoginPage;
+use Unsupervised\Schedular\Auth\RegistrationLoginGate;
+use Unsupervised\Schedular\Auth\RegistrationMailer;
+use Unsupervised\Schedular\Auth\RegistrationPage;
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Auth\StudentAdminGuard;
+use Unsupervised\Schedular\Booking\BookingPage;
 use Unsupervised\Schedular\Availability\AvailabilityRepository;
 use Unsupervised\Schedular\Booking\BookingRepository;
 use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
+use Unsupervised\Schedular\GroupClass\GroupClassPage;
 use Unsupervised\Schedular\Offering\OfferingRepository;
 use Unsupervised\Schedular\Payment\BillingMethodResolver;
+use Unsupervised\Schedular\Payment\CreditRepository;
 use Unsupervised\Schedular\Payment\PaymentRepository;
+use Unsupervised\Schedular\Payment\PaymentDueMailer;
 use Unsupervised\Schedular\Payment\PaymentService;
 use Unsupervised\Schedular\Payment\ReceiptMailer;
+use Unsupervised\Schedular\Payment\ScheduledBillingRunner;
 use Unsupervised\Schedular\Payment\StripeGateway;
 use Unsupervised\Schedular\Payment\StudioSettings;
 use Unsupervised\Schedular\Policy\AcceptanceRepository;
@@ -22,6 +34,7 @@ use Unsupervised\Schedular\Policy\PolicyVersionRepository;
 use Unsupervised\Schedular\Registration\AnswerRepository;
 use Unsupervised\Schedular\Registration\QuestionRepository;
 use Unsupervised\Schedular\Registration\RegistrationGate;
+use Unsupervised\Schedular\Update\UpdateChecker;
 
 class Plugin {
 
@@ -29,10 +42,30 @@ class Plugin {
 		load_plugin_textdomain( 'unsupervised-schedular', false, dirname( plugin_basename( USC_PLUGIN_FILE ) ) . '/languages' );
 
 		global $wpdb;
-		$availability     = new AvailabilityRepository( $wpdb );
-		$bookings         = new BookingRepository( $wpdb );
-		$offerings        = new OfferingRepository( $wpdb );
-		$questions        = new QuestionRepository( $wpdb );
+		if ( ! $wpdb instanceof \wpdb ) {
+			return;
+		}
+
+		// Re-run install steps when the plugin files were updated without a fresh
+		// activation (e.g. a deploy), so schema and data migrations still apply.
+		if ( get_option( 'us_schedular_version' ) !== USC_VERSION ) {
+			( new Installer() )->run();
+		}
+
+		$availability = new AvailabilityRepository( $wpdb );
+		$bookings     = new BookingRepository( $wpdb );
+		$offerings    = new OfferingRepository( $wpdb );
+		$questions    = new QuestionRepository( $wpdb );
+
+		// One-time repair for sites where dbDelta left us_questions.offering_id
+		// NOT NULL (it does not reliably relax NULL-ability), which breaks
+		// account-scope registration questions. Guarded by its own flag rather
+		// than the version gate, since affected sites may already be on the
+		// current version. The flag is only set once the ALTER succeeds.
+		if ( '1' !== get_option( 'us_questions_offering_nullable', '' ) && $questions->ensureOfferingNullable() ) {
+			update_option( 'us_questions_offering_nullable', '1' );
+		}
+
 		$answers          = new AnswerRepository( $wpdb );
 		$policies         = new PolicyRepository( $wpdb );
 		$policyVersions   = new PolicyVersionRepository( $wpdb );
@@ -40,17 +73,35 @@ class Plugin {
 		$acceptances      = new AcceptanceRepository( $wpdb );
 		$invites          = new InviteRepository( $wpdb );
 		$enrollments      = new EnrollmentRepository( $wpdb );
+		$groupAccess      = new GroupAccessRepository( $wpdb );
 		$registrationGate = new RegistrationGate( $questions, $answers, $policies, $policyVersions, $acceptances );
 
 		$paymentRepo    = new PaymentRepository( $wpdb );
+		$creditRepo     = new CreditRepository( $wpdb );
 		$settings       = new StudioSettings();
 		$resolver       = new BillingMethodResolver( $settings );
 		$stripe         = new StripeGateway( $settings );
-		$paymentService = new PaymentService( $paymentRepo, $resolver, new ReceiptMailer(), $bookings, $enrollments, $settings, $stripe );
+		$paymentService = new PaymentService( $paymentRepo, $resolver, new ReceiptMailer(), $bookings, $enrollments, $settings, $stripe, $creditRepo );
 
+		// The shortcode and block wrappers share the same page objects so
+		// front-end output is identical whichever way a page embeds them.
+		$registrationMailer = new RegistrationMailer();
+
+		$bookingPage      = new BookingPage();
+		$loginPage        = new LoginPage();
+		$registrationPage = new RegistrationPage( $invites, $policies, $policyVersions, $acceptances, $settings, $registrationMailer, $questions, $answers, $groupAccess );
+		$groupClassPage   = new GroupClassPage();
+
+		( new ScheduledBillingRunner( $paymentService, $bookings, $enrollments, $offerings, new PaymentDueMailer() ) )->register();
+
+		( new UpdateChecker() )->register();
 		( new RoleManager() )->register();
-		( new AdminMenu( $availability, $bookings, $offerings, $questions, $policies, $policyVersions, $policyService, $invites, $enrollments, $settings, $paymentRepo, $paymentService, $resolver ) )->register();
-		( new RestRegistrar( $availability, $bookings, $offerings, $questions, $policies, $policyVersions, $policyService, $registrationGate, $enrollments, $paymentService ) )->register();
-		( new ShortcodeRegistrar( $invites, $policies, $policyVersions, $acceptances ) )->register();
+		( new RegistrationLoginGate() )->register();
+		( new StudentAdminGuard() )->register();
+		( new EmailConfirmationHandler( $settings, $registrationMailer ) )->register();
+		( new AdminMenu( $availability, $bookings, $offerings, $questions, $answers, $policies, $policyVersions, $policyService, $acceptances, $invites, $enrollments, $groupAccess, $settings, $paymentRepo, $paymentService, $resolver, $registrationMailer, $creditRepo ) )->register();
+		( new RestRegistrar( $availability, $bookings, $offerings, $questions, $policies, $policyVersions, $policyService, $registrationGate, $enrollments, $groupAccess, $paymentService ) )->register();
+		( new ShortcodeRegistrar( $bookingPage, $loginPage, $registrationPage, $groupClassPage ) )->register();
+		( new BlockRegistrar( $bookingPage, $loginPage, $registrationPage, $groupClassPage ) )->register();
 	}
 }

src/Policy/AcceptanceRepository.php

@@ -46,7 +46,8 @@ class AcceptanceRepository {
 	public function findByRegistration( string $registrationType, int $registrationId ): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE registration_type = %s AND registration_id = %d ORDER BY id ASC",
+				'SELECT * FROM %i WHERE registration_type = %s AND registration_id = %d ORDER BY id ASC',
+				$this->table,
 				$registrationType,
 				$registrationId
 			)
@@ -54,4 +55,21 @@ class AcceptanceRepository {
 
 		return array_map( PolicyAcceptance::fromRow( ... ), $rows ?? [] );
 	}
+
+	/**
+	 * Find every acceptance a student has recorded, newest first.
+	 *
+	 * @return list<PolicyAcceptance>
+	 */
+	public function findByStudent( int $studentId ): array {
+		$rows = $this->db->get_results(
+			$this->db->prepare(
+				'SELECT * FROM %i WHERE student_id = %d ORDER BY accepted_at DESC, id DESC',
+				$this->table,
+				$studentId
+			)
+		);
+
+		return array_map( PolicyAcceptance::fromRow( ... ), $rows ?? [] );
+	}
 }

src/Policy/Policy.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Policy;
 
+use Unsupervised\Schedular\Val;
+
 class Policy {
 
 	public const SCOPE_SIGNUP  = 'signup';
@@ -16,6 +18,12 @@ class Policy {
 	 */
 	public const VALID_SCOPES = [ self::SCOPE_SIGNUP, self::SCOPE_BOOKING, self::SCOPE_BOTH ];
 
+	/** Maximum length of the title, matching the `title` VARCHAR(191) column. */
+	public const MAX_TITLE_LENGTH = 191;
+
+	/** Maximum length of the slug, matching the `slug` VARCHAR(191) column. */
+	public const MAX_SLUG_LENGTH = 191;
+
 	public function __construct(
 		public readonly string $title,
 		public readonly string $slug,
@@ -24,13 +32,13 @@ class Policy {
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			title:            $row->title,
-			slug:             $row->slug,
-			currentVersionId: null !== $row->current_version_id ? (int) $row->current_version_id : null,
-			acceptanceScope:  $row->acceptance_scope,
-			id:               (int) $row->id,
+			title:            Val::string( $row->title ),
+			slug:             Val::string( $row->slug ),
+			currentVersionId: Val::intOrNull( $row->current_version_id ),
+			acceptanceScope:  Val::string( $row->acceptance_scope ),
+			id:               Val::int( $row->id ),
 		);
 	}
 

src/Policy/PolicyAcceptance.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Policy;
 
+use Unsupervised\Schedular\Val;
+
 class PolicyAcceptance {
 
 	public const REG_ACCOUNT    = 'account';
@@ -27,15 +29,15 @@ class PolicyAcceptance {
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			policyVersionId:  (int) $row->policy_version_id,
-			studentId:        (int) $row->student_id,
-			registrationType: $row->registration_type,
-			registrationId:   (int) $row->registration_id,
-			ipAddress:        $row->ip_address,
-			acceptedAt:       $row->accepted_at,
-			id:               (int) $row->id,
+			policyVersionId:  Val::int( $row->policy_version_id ),
+			studentId:        Val::int( $row->student_id ),
+			registrationType: Val::string( $row->registration_type ),
+			registrationId:   Val::int( $row->registration_id ),
+			ipAddress:        Val::stringOrNull( $row->ip_address ),
+			acceptedAt:       Val::stringOrNull( $row->accepted_at ),
+			id:               Val::int( $row->id ),
 		);
 	}
 

src/Policy/PolicyController.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Policy;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class PolicyController {
 
@@ -18,57 +19,123 @@ class PolicyController {
 			wp_die( esc_html__( 'You do not have permission to manage policies.', 'unsupervised-schedular' ) );
 		}
 
+		$notice        = '';
+		$viewVersionId = 0;
+
 		if ( isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_policy_action' ) ) {
-			$this->handleFormAction();
+			[ $notice, $viewVersionId ] = $this->handleFormAction();
 		}
 
-		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only policy selector.
-		$policyId       = absint( $_GET['policy_id'] ?? 0 );
+		// phpcs:disable WordPress.Security.NonceVerification.Recommended -- read-only policy/version selectors.
+		$policyId = absint( Val::int( $_GET['policy_id'] ?? 0 ) );
+		if ( 0 === $viewVersionId ) {
+			$viewVersionId = absint( Val::int( $_GET['version_id'] ?? 0 ) );
+		}
+		// phpcs:enable WordPress.Security.NonceVerification.Recommended
+
 		$policyList     = $this->policies->findAll();
 		$selectedPolicy = $policyId > 0 ? $this->policies->findById( $policyId ) : null;
 		$policyVersions = null !== $selectedPolicy ? $this->versions->findByPolicy( (int) $selectedPolicy->id ) : null;
+		$viewedVersion  = null !== $selectedPolicy ? $this->loadVersionForPolicy( (int) $selectedPolicy->id, $viewVersionId ) : null;
 
 		include USC_PLUGIN_DIR . 'templates/admin/policies.php';
 	}
 
-	private function handleFormAction(): void {
+	/**
+	 * Process the posted action.
+	 *
+	 * @return array{string, int} Status notice, and the version to open in the
+	 *                            viewer (0 to leave the current selection alone).
+	 */
+	private function handleFormAction(): array {
 		// Nonce is verified by the caller (renderPage) before this method runs.
 		// phpcs:disable WordPress.Security.NonceVerification.Missing
-		$action = sanitize_key( wp_unslash( $_POST['usc_action'] ?? '' ) );
+		$action = sanitize_key( Val::string( wp_unslash( $_POST['usc_action'] ?? '' ) ) );
 
 		if ( 'create_policy' === $action ) {
-			$title   = sanitize_text_field( wp_unslash( $_POST['title'] ?? '' ) );
-			$slugRaw = sanitize_text_field( wp_unslash( $_POST['slug'] ?? '' ) );
+			$title   = sanitize_text_field( Val::string( wp_unslash( $_POST['title'] ?? '' ) ) );
+			$slugRaw = sanitize_text_field( Val::string( wp_unslash( $_POST['slug'] ?? '' ) ) );
 			$slug    = sanitize_title( '' !== $slugRaw ? $slugRaw : $title );
-			$scope   = sanitize_key( wp_unslash( $_POST['acceptance_scope'] ?? Policy::SCOPE_BOOKING ) );
+			$scope   = sanitize_key( Val::string( wp_unslash( $_POST['acceptance_scope'] ?? Policy::SCOPE_BOOKING ) ) );
 
 			if ( ! in_array( $scope, Policy::VALID_SCOPES, true ) ) {
 				$scope = Policy::SCOPE_BOOKING;
 			}
 
-			if ( '' !== $title && '' !== $slug && null === $this->policies->findBySlug( $slug ) ) {
+			$withinLimits = mb_strlen( $title ) <= Policy::MAX_TITLE_LENGTH && mb_strlen( $slug ) <= Policy::MAX_SLUG_LENGTH;
+
+			if ( '' !== $title && '' !== $slug && $withinLimits && null === $this->policies->findBySlug( $slug ) ) {
 				$this->service->createPolicy( $title, $slug, $scope );
 			}
 
-			return;
+			return [ '', 0 ];
 		}
 
-		$policyId = absint( $_POST['policy_id'] ?? 0 );
+		$policyId = absint( Val::int( $_POST['policy_id'] ?? 0 ) );
 		if ( $policyId <= 0 || null === $this->policies->findById( $policyId ) ) {
-			return;
+			return [ '', 0 ];
 		}
 
 		if ( 'add_version' === $action ) {
-			$body = wp_kses_post( wp_unslash( $_POST['body'] ?? '' ) );
+			$body = wp_kses_post( Val::string( wp_unslash( $_POST['body'] ?? '' ) ) );
 			$this->service->addDraftVersion( $policyId, $body );
 		}
 
+		if ( 'edit_version' === $action ) {
+			$source = $this->loadVersionForPolicy( $policyId, absint( Val::int( $_POST['version_id'] ?? 0 ) ) );
+			if ( null === $source ) {
+				return [ '', 0 ];
+			}
+
+			$body = wp_kses_post( Val::string( wp_unslash( $_POST['body'] ?? '' ) ) );
+
+			// A draft has never been shown to a student, so it is edited in place.
+			// A published (or archived) version is what students accepted, so an
+			// edit branches a new draft and leaves the original untouched.
+			if ( PolicyVersion::STATUS_DRAFT === $source->status ) {
+				$this->versions->updateBody( (int) $source->id, $body );
+
+				return [
+					sprintf(
+						/* translators: %d: the edited version number. */
+						__( 'Draft version %d was updated.', 'unsupervised-schedular' ),
+						$source->versionNumber
+					),
+					(int) $source->id,
+				];
+			}
+
+			return [
+				sprintf(
+					/* translators: %d: the version number the edit was based on. */
+					__( 'Your changes to version %d were saved as a new draft version.', 'unsupervised-schedular' ),
+					$source->versionNumber
+				),
+				$this->service->addDraftVersion( $policyId, $body ),
+			];
+		}
+
 		if ( 'publish_version' === $action ) {
-			$versionId = absint( $_POST['version_id'] ?? 0 );
+			$versionId = absint( Val::int( $_POST['version_id'] ?? 0 ) );
 			if ( $versionId > 0 ) {
 				$this->service->publishVersion( $policyId, $versionId );
 			}
 		}
 		// phpcs:enable WordPress.Security.NonceVerification.Missing
+
+		return [ '', 0 ];
+	}
+
+	/**
+	 * Load a version by id, confirming it belongs to the given policy.
+	 */
+	private function loadVersionForPolicy( int $policyId, int $versionId ): ?PolicyVersion {
+		if ( $versionId <= 0 ) {
+			return null;
+		}
+
+		$version = $this->versions->findById( $versionId );
+
+		return null !== $version && $version->policyId === $policyId ? $version : null;
 	}
 }

src/Policy/PolicyEndpoint.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Policy;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+use Unsupervised\Schedular\Val;
 
 class PolicyEndpoint {
 
@@ -13,6 +14,11 @@ class PolicyEndpoint {
 		private PolicyService $service,
 	) {}
 
+	/**
+	 * Registers this endpoint's REST routes.
+	 *
+	 * @param non-falsy-string $route_namespace REST namespace the routes are registered under (e.g. `us-scheduler/v1`).
+	 */
 	public function registerRoutes( string $route_namespace ): void {
 		register_rest_route(
 			$route_namespace,
@@ -74,7 +80,7 @@ class PolicyEndpoint {
 	 * `both`-scoped policies).
 	 */
 	public function index( \WP_REST_Request $request ): \WP_REST_Response {
-		$scope    = (string) $request->get_param( 'scope' );
+		$scope    = Val::string( $request->get_param( 'scope' ) );
 		$policies = in_array( $scope, [ Policy::SCOPE_SIGNUP, Policy::SCOPE_BOOKING ], true )
 			? $this->policies->findForScope( $scope )
 			: $this->policies->findAll();
@@ -97,7 +103,10 @@ class PolicyEndpoint {
 				'slug'              => $policy->slug,
 				'policy_version_id' => $version->id,
 				'version_number'    => $version->versionNumber,
-				'body'              => $version->body,
+				// Bodies are kses'd on every write path, but the booking JS renders
+				// this HTML raw — bodyHtml() sanitises at output too, so a missed
+				// write path can never become stored XSS.
+				'body'              => $version->bodyHtml(),
 			];
 		}
 
@@ -105,22 +114,40 @@ class PolicyEndpoint {
 	}
 
 	public function create( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$title = sanitize_text_field( (string) $request->get_param( 'title' ) );
+		$title = sanitize_text_field( Val::string( $request->get_param( 'title' ) ) );
 		if ( '' === $title ) {
 			return $this->invalid( __( 'A policy title is required.', 'unsupervised-schedular' ) );
 		}
+		if ( mb_strlen( $title ) > Policy::MAX_TITLE_LENGTH ) {
+			return $this->invalid(
+				sprintf(
+					/* translators: %d: maximum character count. */
+					__( 'The policy title must be %d characters or fewer.', 'unsupervised-schedular' ),
+					Policy::MAX_TITLE_LENGTH
+				)
+			);
+		}
 
-		$slugParam = sanitize_text_field( (string) $request->get_param( 'slug' ) );
+		$slugParam = sanitize_text_field( Val::string( $request->get_param( 'slug' ) ) );
 		$slug      = sanitize_title( '' !== $slugParam ? $slugParam : $title );
 		if ( '' === $slug ) {
 			return $this->invalid( __( 'A valid policy slug is required.', 'unsupervised-schedular' ) );
 		}
+		if ( mb_strlen( $slug ) > Policy::MAX_SLUG_LENGTH ) {
+			return $this->invalid(
+				sprintf(
+					/* translators: %d: maximum character count. */
+					__( 'The policy slug must be %d characters or fewer.', 'unsupervised-schedular' ),
+					Policy::MAX_SLUG_LENGTH
+				)
+			);
+		}
 
 		if ( null !== $this->policies->findBySlug( $slug ) ) {
 			return new \WP_Error( 'duplicate_slug', __( 'A policy with that slug already exists.', 'unsupervised-schedular' ), [ 'status' => 409 ] );
 		}
 
-		$scope = (string) ( $request->get_param( 'acceptance_scope' ) ?? Policy::SCOPE_BOOKING );
+		$scope = Val::string( $request->get_param( 'acceptance_scope' ) ?? Policy::SCOPE_BOOKING );
 		if ( ! in_array( $scope, Policy::VALID_SCOPES, true ) ) {
 			return $this->invalid( __( 'Invalid acceptance scope.', 'unsupervised-schedular' ) );
 		}
@@ -131,12 +158,12 @@ class PolicyEndpoint {
 	}
 
 	public function addVersion( \WP_REST_Request $request ): \WP_REST_Response|\WP_Error {
-		$policy = $this->policies->findById( absint( $request->get_param( 'id' ) ) );
+		$policy = $this->policies->findById( absint( Val::int( $request->get_param( 'id' ) ) ) );
 		if ( null === $policy ) {
 			return $this->notFound();
 		}
 
-		$body = wp_kses_post( (string) $request->get_param( 'body' ) );
+		$body = wp_kses_post( Val::string( $request->get_param( 'body' ) ) );
 		$id   = $this->service->addDraftVersion( (int) $policy->id, $body );
 
 		return new \WP_REST_Response( [ 'id' => $id ], 201 );
@@ -152,7 +179,7 @@ class PolicyEndpoint {
 			return $this->invalid( __( 'Only draft versions can be edited.', 'unsupervised-schedular' ) );
 		}
 
-		$body = wp_kses_post( (string) $request->get_param( 'body' ) );
+		$body = wp_kses_post( Val::string( $request->get_param( 'body' ) ) );
 		$this->versions->updateBody( (int) $version->id, $body );
 
 		return new \WP_REST_Response(
@@ -170,7 +197,7 @@ class PolicyEndpoint {
 			return $version;
 		}
 
-		$this->service->publishVersion( (int) $request->get_param( 'id' ), (int) $version->id );
+		$this->service->publishVersion( Val::int( $request->get_param( 'id' ) ), (int) $version->id );
 
 		return new \WP_REST_Response(
 			[
@@ -199,8 +226,8 @@ class PolicyEndpoint {
 	 * Load the version named in the route and confirm it belongs to the policy.
 	 */
 	private function loadVersionForPolicy( \WP_REST_Request $request ): PolicyVersion|\WP_Error {
-		$policyId = absint( $request->get_param( 'id' ) );
-		$version  = $this->versions->findById( absint( $request->get_param( 'vid' ) ) );
+		$policyId = absint( Val::int( $request->get_param( 'id' ) ) );
+		$version  = $this->versions->findById( absint( Val::int( $request->get_param( 'vid' ) ) ) );
 
 		if ( null === $version || $version->policyId !== $policyId ) {
 			return $this->notFound();

src/Policy/PolicyRepository.php

@@ -36,7 +36,8 @@ class PolicyRepository {
 	public function findForScope( string $scope ): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE acceptance_scope = %s OR acceptance_scope = %s ORDER BY title ASC",
+				'SELECT * FROM %i WHERE acceptance_scope = %s OR acceptance_scope = %s ORDER BY title ASC',
+				$this->table,
 				$scope,
 				Policy::SCOPE_BOTH
 			)
@@ -68,7 +69,7 @@ class PolicyRepository {
 
 	public function findById( int $id ): ?Policy {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE id = %d", $id )
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
 		);
 
 		return $row ? Policy::fromRow( $row ) : null;
@@ -76,7 +77,7 @@ class PolicyRepository {
 
 	public function findBySlug( string $slug ): ?Policy {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE slug = %s", $slug )
+			$this->db->prepare( 'SELECT * FROM %i WHERE slug = %s', $this->table, $slug )
 		);
 
 		return $row ? Policy::fromRow( $row ) : null;

src/Policy/PolicyVersion.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Unsupervised\Schedular\Policy;
 
+use Unsupervised\Schedular\Val;
+
 class PolicyVersion {
 
 	public const STATUS_DRAFT     = 'draft';
@@ -25,14 +27,14 @@ class PolicyVersion {
 		public readonly ?int $id = null,
 	) {}
 
-	public static function fromRow( object $row ): self {
+	public static function fromRow( \stdClass $row ): self {
 		return new self(
-			policyId:      (int) $row->policy_id,
-			versionNumber: (int) $row->version_number,
-			body:          $row->body,
-			status:        $row->status,
-			publishedAt:   $row->published_at,
-			id:            (int) $row->id,
+			policyId:      Val::int( $row->policy_id ),
+			versionNumber: Val::int( $row->version_number ),
+			body:          Val::stringOrNull( $row->body ),
+			status:        Val::string( $row->status ),
+			publishedAt:   Val::stringOrNull( $row->published_at ),
+			id:            Val::int( $row->id ),
 		);
 	}
 
@@ -40,6 +42,19 @@ class PolicyVersion {
 		return self::STATUS_PUBLISHED === $this->status;
 	}
 
+	/**
+	 * The body as display-ready HTML.
+	 *
+	 * Policy bodies are typed into a plain textarea, so most are written as
+	 * blank-line-separated prose with no markup at all — dropped into a page
+	 * as-is that collapses into one unreadable run of text. Running the same
+	 * `wpautop()` WordPress applies to post content turns those breaks into
+	 * paragraphs, and leaves bodies that do carry markup alone.
+	 */
+	public function bodyHtml(): string {
+		return wpautop( wp_kses_post( (string) $this->body ) );
+	}
+
 	/**
 	 * Returns a plain array representation of the version.
 	 *

src/Policy/PolicyVersionRepository.php

@@ -59,7 +59,8 @@ class PolicyVersionRepository {
 	public function findByPolicy( int $policyId ): array {
 		$rows = $this->db->get_results(
 			$this->db->prepare(
-				"SELECT * FROM {$this->table} WHERE policy_id = %d ORDER BY version_number DESC",
+				'SELECT * FROM %i WHERE policy_id = %d ORDER BY version_number DESC',
+				$this->table,
 				$policyId
 			)
 		);
@@ -69,7 +70,7 @@ class PolicyVersionRepository {
 
 	public function findById( int $id ): ?PolicyVersion {
 		$row = $this->db->get_row(
-			$this->db->prepare( "SELECT * FROM {$this->table} WHERE id = %d", $id )
+			$this->db->prepare( 'SELECT * FROM %i WHERE id = %d', $this->table, $id )
 		);
 
 		return $row ? PolicyVersion::fromRow( $row ) : null;
@@ -80,7 +81,7 @@ class PolicyVersionRepository {
 	 */
 	public function maxVersionNumber( int $policyId ): int {
 		$max = $this->db->get_var(
-			$this->db->prepare( "SELECT MAX(version_number) FROM {$this->table} WHERE policy_id = %d", $policyId )
+			$this->db->prepare( 'SELECT MAX(version_number) FROM %i WHERE policy_id = %d', $this->table, $policyId )
 		);
 
 		return null === $max ? 0 : (int) $max;