docs/features/account-registration.md

@@ -69,6 +69,7 @@ confirmation token's SHA-256 hash is stored; the token expires after 48h
 | `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`)       |
 | `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 / for group links |
@@ -96,7 +97,7 @@ recorded in `us_policy_acceptances` with `registration_type = account` and
 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.
+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. 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`).

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                                                       |
@@ -53,14 +55,62 @@ 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**, which renders three controls under each invite-only
+class:
+
+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`.
+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** (`view_all_lessons` / studio admin): all active enrolments across instructors
 - **My Lessons → My Group Classes** (`view_own_lessons` / instructor): the instructor's
   own group classes, each showing its active-enrolment count against capacity and a
-  per-class roster of enrolled students with enrolment and payment status
+  per-class roster of enrolled students with enrolment and payment status. Invite-only
+  classes additionally list who has been invited but not yet enrolled and carry the
+  add/make-available/invite-by-email controls (nonce-checked `usc_action` POSTs, scoped to
+  the owning instructor)
 
 ## 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` — `renderPage` (studio admin, `view_all_lessons`) and `renderInstructorPage` (instructor, `view_own_lessons`)
 - REST endpoint: `Unsupervised\Schedular\GroupClass\EnrollmentEndpoint`
@@ -73,7 +123,11 @@ instructor's group classes if the caller has `view_own_lessons` on those offerin
 > for the card/e-transfer/comp flows.
 
 ## Tests
-- `tests/Unit/GroupClass/GroupClassControllerTest.php`
+- `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/offerings.md

@@ -22,6 +22,7 @@ An offering is anything a student can register for: a private-lesson type (30 or
 | `term_end`         | DATE             | Group / term offerings — last day; NULL otherwise           |
 | `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                                              |
 

src/AdminMenu.php

@@ -18,6 +18,7 @@ use Unsupervised\Schedular\Auth\StudentHistory;
 use Unsupervised\Schedular\Booking\BookingRepository;
 use Unsupervised\Schedular\Booking\LessonController;
 use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
 use Unsupervised\Schedular\GroupClass\GroupClassController;
 use Unsupervised\Schedular\Offering\OfferingController;
 use Unsupervised\Schedular\Offering\OfferingRepository;
@@ -53,15 +54,15 @@ class AdminMenu {
 	private PaymentController $paymentController;
 	private PaymentReportController $paymentReportController;
 
-	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, StudioSettings $settings, PaymentRepository $payments, PaymentService $paymentService, BillingMethodResolver $resolver ) {
+	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 ) {
 		$this->availabilityController         = new AvailabilityController( $availability, $offerings );
 		$this->lessonController               = new LessonController( $bookings, $payments, $availability );
 		$this->offeringController             = new OfferingController( $offerings );
 		$this->questionController             = new QuestionController( $questions, $offerings );
 		$this->policyController               = new PolicyController( $policies, $policyVersions, $policyService );
 		$this->registrationController         = new RegistrationController( $invites );
-		$this->registrationApprovalController = new RegistrationApprovalController( new RegistrationMailer() );
+		$this->registrationApprovalController = new RegistrationApprovalController( $registrationMailer );
-		$this->groupClassController           = new GroupClassController( $enrollments, $offerings, $payments );
+		$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 ), new StudentActions( $bookings, $availability, $enrollments, $paymentService ) );
 		$this->instructorController           = new InstructorController();
 		$this->settings                       = $settings;

src/Auth/Invite.php

@@ -51,6 +51,7 @@ class Invite {
 		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,
 	) {}
 
@@ -66,6 +67,7 @@ class Invite {
 			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 ),
 		);
 	}
@@ -132,6 +134,7 @@ class Invite {
 			'accepted_user_id' => $this->acceptedUserId,
 			'accepted_at'      => $this->acceptedAt,
 			'expires_at'       => $this->expiresAt,
+			'offering_id'      => $this->offeringId,
 		];
 	}
 }

src/Auth/InviteRepository.php

@@ -23,6 +23,7 @@ class InviteRepository {
 				'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,
@@ -30,7 +31,7 @@ class InviteRepository {
 				'accepted_at'      => $invite->acceptedAt,
 				'expires_at'       => $invite->expiresAt,
 			],
-			[ '%s', '%s', '%s', '%s', '%s', '%d', '%d', '%s', '%s', '%s' ]
+			[ '%s', '%s', '%s', '%s', '%d', '%s', '%d', '%d', '%s', '%s', '%s' ]
 		);
 
 		return false === $result ? 0 : $this->db->insert_id;

src/Auth/RegistrationMailer.php

@@ -105,6 +105,56 @@ class RegistrationMailer {
 		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' );
 

src/Auth/RegistrationPage.php

@@ -3,6 +3,7 @@ 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;
@@ -38,6 +39,7 @@ class RegistrationPage {
 		private RegistrationMailer $mailer,
 		private QuestionRepository $questions,
 		private AnswerRepository $answers,
+		private GroupAccessRepository $access,
 	) {}
 
 	/**
@@ -203,6 +205,11 @@ class RegistrationPage {
 		if ( $inviteValid && ! $invite->isGroup() ) {
 			$this->invites->markAccepted( (int) $invite->id, (int) $userId );
 
+			// 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 );
 

src/GroupClass/EnrollmentEndpoint.php

@@ -19,6 +19,7 @@ class EnrollmentEndpoint {
 		private OfferingRepository $offerings,
 		private RegistrationGate $gate,
 		private PaymentService $payments,
+		private GroupAccessRepository $access,
 	) {}
 
 	/**
@@ -88,6 +89,12 @@ 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 ] );
+		}
+
 		if ( null !== $offering->capacity && $this->enrollments->countActiveForOffering( $offeringId ) >= $offering->capacity ) {
 			return new \WP_Error( 'class_full', __( 'This class is full.', 'unsupervised-schedular' ), [ 'status' => 409 ] );
 		}
@@ -110,6 +117,12 @@ class EnrollmentEndpoint {
 
 		$this->gate->record( PolicyAcceptance::REG_ENROLLMENT, $id, $studentId, $offeringId, $answers, $acceptedVersionIds, $this->clientIp() );
 
+		// 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 );
+		}
+
 		$payment = null;
 		if ( $offering->price > 0.0 ) {
 			$payment = $this->payments->createForRegistration( Payment::REG_ENROLLMENT, $id, $studentId, $offering->instructorId, $offering->price, $offering->currency, $offering->etransferEmail );

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

@@ -3,10 +3,17 @@ 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\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 {
 
@@ -14,6 +21,10 @@ class GroupClassController {
 		private EnrollmentRepository $enrollments,
 		private OfferingRepository $offerings,
 		private PaymentRepository $payments,
+		private GroupAccessRepository $access,
+		private PaymentService $paymentService,
+		private InviteRepository $invites,
+		private RegistrationMailer $mailer,
 	) {}
 
 	public function renderPage(): void {
@@ -41,7 +52,8 @@ class GroupClassController {
 	/**
 	 * Instructor view: their own group classes with per-class rosters. Each class
 	 * shows its enrolment count against capacity plus a roster of enrolled
-	 * students with enrolment and payment status.
+	 * students with enrolment and payment status. Invite-only classes also carry
+	 * controls to add, grant access to, or email-invite students.
 	 */
 	public function renderInstructorPage(): void {
 		if ( ! current_user_can( RoleManager::CAP_VIEW_LESSONS ) ) {
@@ -49,6 +61,12 @@ class GroupClassController {
 		}
 
 		$instructorId = get_current_user_id();
+
+		$notice = '';
+		if ( isset( $_POST['usc_action'] ) && check_admin_referer( 'usc_group_action' ) ) {
+			$notice = $this->handleFormAction( $instructorId );
+		}
+
 		$enrollments = $this->enrollments->findByInstructor( $instructorId );
 
 		$classes = array_map(
@@ -76,15 +94,280 @@ class GroupClassController {
 				}
 
 				return [
+					'id'          => $offering->id,
 					'title'       => $offering->title,
 					'capacity'    => $offering->capacity,
 					'enrolled'    => $enrolled,
+					'invite_only' => $offering->isInviteOnly(),
 					'roster'      => $roster,
+					'invited'     => $offering->isInviteOnly() ? $this->pendingInvites( (int) $offering->id ) : [],
 				];
 			},
 			$this->offerings->findAll( $instructorId, Offering::KIND_GROUP_CLASS )
 		);
 
+		$students = $this->studentOptions();
+
 		include USC_PLUGIN_DIR . 'templates/admin/my-group-classes.php';
 	}
+
+	/**
+	 * 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.
+	 * Every action is scoped to a group class the current instructor owns.
+	 */
+	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;
+
+		if ( null === $offering || $offering->instructorId !== $instructorId || 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).
+	 *
+	 * @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/Offering/Offering.php

@@ -27,6 +27,19 @@ class Offering {
 	 */
 	public const VALID_BILLING_MODES = [ self::BILLING_ONE_TIME, self::BILLING_FULL_TERM ];
 
+	/** 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 ];
+
 	public function __construct(
 		public readonly int $instructorId,
 		public readonly string $kind,
@@ -43,10 +56,19 @@ class Offering {
 		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,
 	) {}
 
+	/**
+	 * 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;
+	}
+
 	/**
 	 * 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
@@ -85,6 +107,7 @@ class Offering {
 			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 ),
 		);
@@ -116,6 +139,7 @@ class Offering {
 			'term_end'                  => $this->termEnd,
 			'schedule_note'             => $this->scheduleNote,
 			'cancellation_cutoff_hours' => $this->cancellationCutoffHours,
+			'access_mode'               => $this->accessMode,
 			'is_active'                 => $this->isActive,
 		];
 

src/Offering/OfferingController.php

@@ -135,6 +135,7 @@ class OfferingController {
 			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'] ?? '' ) ) ) ),
 			cancellationCutoffHours: $cutoffHours,
+			accessMode:      isset( $_POST['invite_only'] ) ? Offering::ACCESS_INVITE_ONLY : Offering::ACCESS_PUBLIC,
 			isActive:        isset( $_POST['is_active'] ),
 			id:              $existing?->id,
 		);

src/Offering/OfferingEndpoint.php

@@ -4,11 +4,15 @@ declare(strict_types=1);
 namespace Unsupervised\Schedular\Offering;
 
 use Unsupervised\Schedular\Auth\RoleManager;
+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.
@@ -62,16 +66,53 @@ class OfferingEndpoint {
 	}
 
 	public function index( \WP_REST_Request $request ): \WP_REST_Response {
-		$offerings = $this->repository->findAll(
+		$instructorId = Val::int( $request->get_param( 'instructor_id' ) );
-			Val::int( $request->get_param( 'instructor_id' ) ),
+		$kind         = Val::string( $request->get_param( 'kind' ) );
-			Val::string( $request->get_param( 'kind' ) ),
+
-			activeOnly: true,
+		// 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.
 		return new \WP_REST_Response( array_map( fn( Offering $o ) => $o->toArray( includeEtransferEmail: false ), $offerings ), 200 );
 	}
 
+	/**
+	 * 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( Val::string( $request->get_param( 'title' ) ) );
 		if ( '' === $title ) {
@@ -104,6 +145,7 @@ class OfferingEndpoint {
 			scheduleNote:    $this->nullableText( $request->get_param( 'schedule_note' ) ),
 			etransferEmail:  $this->nullableEmail( $request->get_param( 'etransfer_email' ) ),
 			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' ),
 		);
 
@@ -150,6 +192,7 @@ class OfferingEndpoint {
 			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,
 			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,
 		);
@@ -212,6 +255,12 @@ class OfferingEndpoint {
 		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 : Val::int( $value );
 	}

src/Offering/OfferingRepository.php

@@ -15,11 +15,11 @@ 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,
-	 * cancellation_cutoff_hours, is_active).
+	 * 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', '%d' ];
+	private const COLUMN_FORMATS = [ '%d', '%s', '%s', '%s', '%d', '%f', '%s', '%s', '%d', '%d', '%s', '%s', '%s', '%s', '%d', '%s', '%d' ];
 
 	public function insert( Offering $offering ): int {
 		$this->db->insert(
@@ -63,16 +63,19 @@ class OfferingRepository {
 			'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 = [];
 
@@ -91,6 +94,11 @@ class OfferingRepository {
 			$params[] = $activeOnly ? 1 : 0;
 		}
 
+		if ( null !== $accessMode ) {
+			$where[]  = 'access_mode = %s';
+			$params[] = $accessMode;
+		}
+
 		$whereClause = implode( ' AND ', $where );
 		$sql         = "SELECT * FROM %i WHERE {$whereClause} ORDER BY title ASC";
 

src/Plugin.php

@@ -14,6 +14,7 @@ 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;
@@ -58,6 +59,7 @@ 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 );
@@ -72,15 +74,15 @@ class Plugin {
 
 		$bookingPage      = new BookingPage();
 		$loginPage        = new LoginPage();
-		$registrationPage = new RegistrationPage( $invites, $policies, $policyVersions, $acceptances, $settings, $registrationMailer, $questions, $answers );
+		$registrationPage = new RegistrationPage( $invites, $policies, $policyVersions, $acceptances, $settings, $registrationMailer, $questions, $answers, $groupAccess );
 		$groupClassPage   = new GroupClassPage();
 
 		( new UpdateChecker() )->register();
 		( new RoleManager() )->register();
 		( new RegistrationLoginGate() )->register();
 		( new EmailConfirmationHandler( $settings, $registrationMailer ) )->register();
-		( new AdminMenu( $availability, $bookings, $offerings, $questions, $answers, $policies, $policyVersions, $policyService, $acceptances, $invites, $enrollments, $settings, $paymentRepo, $paymentService, $resolver ) )->register();
+		( new AdminMenu( $availability, $bookings, $offerings, $questions, $answers, $policies, $policyVersions, $policyService, $acceptances, $invites, $enrollments, $groupAccess, $settings, $paymentRepo, $paymentService, $resolver, $registrationMailer ) )->register();
-		( new RestRegistrar( $availability, $bookings, $offerings, $questions, $policies, $policyVersions, $policyService, $registrationGate, $enrollments, $paymentService ) )->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/RestRegistrar.php

@@ -9,6 +9,7 @@ use Unsupervised\Schedular\Booking\BookingEndpoint;
 use Unsupervised\Schedular\Booking\BookingRepository;
 use Unsupervised\Schedular\Booking\CancellationPolicy;
 use Unsupervised\Schedular\GroupClass\EnrollmentEndpoint;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
 use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
 use Unsupervised\Schedular\Offering\OfferingEndpoint;
 use Unsupervised\Schedular\Offering\OfferingRepository;
@@ -35,13 +36,13 @@ class RestRegistrar {
 	private EnrollmentEndpoint $enrollmentEndpoint;
 	private PaymentEndpoint $paymentEndpoint;
 
-	public function __construct( AvailabilityRepository $availability, BookingRepository $bookings, OfferingRepository $offerings, QuestionRepository $questions, PolicyRepository $policies, PolicyVersionRepository $policyVersions, PolicyService $policyService, RegistrationGate $gate, EnrollmentRepository $enrollments, PaymentService $paymentService ) {
+	public function __construct( AvailabilityRepository $availability, BookingRepository $bookings, OfferingRepository $offerings, QuestionRepository $questions, PolicyRepository $policies, PolicyVersionRepository $policyVersions, PolicyService $policyService, RegistrationGate $gate, EnrollmentRepository $enrollments, GroupAccessRepository $groupAccess, PaymentService $paymentService ) {
 		$this->availabilityEndpoint = new AvailabilityEndpoint( $availability, $offerings );
 		$this->bookingEndpoint      = new BookingEndpoint( $availability, $bookings, $offerings, $gate, $paymentService, new CancellationPolicy( new StudioSettings() ) );
-		$this->offeringEndpoint     = new OfferingEndpoint( $offerings );
+		$this->offeringEndpoint     = new OfferingEndpoint( $offerings, $groupAccess );
 		$this->questionEndpoint     = new QuestionEndpoint( $questions, $offerings );
 		$this->policyEndpoint       = new PolicyEndpoint( $policies, $policyVersions, $policyService );
-		$this->enrollmentEndpoint   = new EnrollmentEndpoint( $enrollments, $offerings, $gate, $paymentService );
+		$this->enrollmentEndpoint   = new EnrollmentEndpoint( $enrollments, $offerings, $gate, $paymentService, $groupAccess );
 		$this->paymentEndpoint      = new PaymentEndpoint( $paymentService );
 	}
 

src/Schema.php

@@ -66,6 +66,7 @@ class Schema {
                 schedule_note    VARCHAR(191)    DEFAULT NULL,
                 etransfer_email  VARCHAR(191)    DEFAULT NULL,
                 cancellation_cutoff_hours SMALLINT UNSIGNED DEFAULT NULL,
+                access_mode      VARCHAR(20)     NOT NULL DEFAULT 'public',
                 is_active        TINYINT(1)      NOT NULL DEFAULT 1,
                 created_at       DATETIME        NOT NULL,
                 PRIMARY KEY (id),
@@ -190,6 +191,7 @@ class Schema {
                 token            VARCHAR(64)     NOT NULL,
                 role             VARCHAR(32)     NOT NULL DEFAULT 'us_student',
                 kind             VARCHAR(10)     NOT NULL DEFAULT 'personal',
+                offering_id      BIGINT UNSIGNED DEFAULT NULL,
                 status           VARCHAR(20)     NOT NULL DEFAULT 'pending',
                 invited_by       BIGINT UNSIGNED DEFAULT NULL,
                 accepted_user_id BIGINT UNSIGNED DEFAULT NULL,
@@ -201,6 +203,22 @@ class Schema {
                 KEY email (email),
                 KEY status (status)
             ) {$charset};",
+
+			"CREATE TABLE {$prefix}us_group_access (
+                id            BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+                offering_id   BIGINT UNSIGNED NOT NULL,
+                student_id    BIGINT UNSIGNED DEFAULT NULL,
+                email         VARCHAR(191)    NOT NULL DEFAULT '',
+                invite_id     BIGINT UNSIGNED DEFAULT NULL,
+                status        VARCHAR(20)     NOT NULL DEFAULT 'invited',
+                invited_by    BIGINT UNSIGNED DEFAULT NULL,
+                created_at    DATETIME        NOT NULL,
+                PRIMARY KEY (id),
+                KEY offering_id (offering_id),
+                KEY student_id (student_id),
+                KEY email (email),
+                KEY status (status)
+            ) {$charset};",
 		];
 	}
 }

templates/admin/my-group-classes.php

@@ -5,18 +5,29 @@ if (! defined('ABSPATH')) {
     exit;
 }
 
-/** @var list<array{title: string, capacity: int|null, enrolled: int, roster: list<array{student: string, status: string, payment: string|null}>}> $classes */
+/**
+ * @var list<array{id: int|null, title: string, capacity: int|null, enrolled: int, invite_only: bool, roster: list<array{student: string, status: string, payment: string|null}>, invited: list<array{who: string, kind: string}>}> $classes
+ * @var list<array{id: int, name: string}> $students
+ * @var string $notice
+ */
 ?>
 <div class="wrap">
     <h1><?php esc_html_e('My Group Classes', 'unsupervised-schedular'); ?></h1>
     <p class="description"><?php esc_html_e('Your group classes and their rosters.', 'unsupervised-schedular'); ?></p>
 
+    <?php if ('' !== $notice) : ?>
+        <div class="notice notice-info is-dismissible"><p><?php echo esc_html($notice); ?></p></div>
+    <?php endif; ?>
+
     <?php if (empty($classes)) : ?>
         <p><?php esc_html_e('You have no group classes.', 'unsupervised-schedular'); ?></p>
     <?php else : ?>
         <?php foreach ($classes as $class) : ?>
             <h2>
                 <?php echo esc_html($class['title']); ?>
+                <?php if ($class['invite_only']) : ?>
+                    <span class="dashicons dashicons-lock" title="<?php esc_attr_e('Invite only', 'unsupervised-schedular'); ?>"></span>
+                <?php endif; ?>
                 <span class="count">
                     <?php
                     if (null === $class['capacity']) {
@@ -59,6 +70,60 @@ if (! defined('ABSPATH')) {
                     </tbody>
                 </table>
             <?php endif; ?>
+
+            <?php if ($class['invite_only']) : ?>
+                <?php if (! empty($class['invited'])) : ?>
+                    <h4><?php esc_html_e('Invited (not yet enrolled)', 'unsupervised-schedular'); ?></h4>
+                    <ul class="ul-disc">
+                        <?php foreach ($class['invited'] as $invitee) : ?>
+                            <li><?php echo esc_html($invitee['who'] . ' — ' . $invitee['kind']); ?></li>
+                        <?php endforeach; ?>
+                    </ul>
+                <?php endif; ?>
+
+                <div class="us-group-invite-controls" style="display:flex; flex-wrap:wrap; gap:2em; margin:1em 0 2em;">
+                    <form method="post">
+                        <?php wp_nonce_field('usc_group_action'); ?>
+                        <input type="hidden" name="offering_id" value="<?php echo esc_attr((string) $class['id']); ?>">
+                        <h4><?php esc_html_e('Add students directly', 'unsupervised-schedular'); ?></h4>
+                        <p class="description"><?php esc_html_e('Enrols them now with a pending payment.', 'unsupervised-schedular'); ?></p>
+                        <select name="student_ids[]" multiple size="5" style="min-width:16em;">
+                            <?php foreach ($students as $student) : ?>
+                                <option value="<?php echo esc_attr((string) $student['id']); ?>"><?php echo esc_html($student['name']); ?></option>
+                            <?php endforeach; ?>
+                        </select>
+                        <p>
+                            <button type="submit" name="usc_action" value="add_direct" class="button"><?php esc_html_e('Add to class', 'unsupervised-schedular'); ?></button>
+                        </p>
+                    </form>
+
+                    <form method="post">
+                        <?php wp_nonce_field('usc_group_action'); ?>
+                        <input type="hidden" name="offering_id" value="<?php echo esc_attr((string) $class['id']); ?>">
+                        <h4><?php esc_html_e('Make available to students', 'unsupervised-schedular'); ?></h4>
+                        <p class="description"><?php esc_html_e('Grants access so they can enrol themselves.', 'unsupervised-schedular'); ?></p>
+                        <select name="student_ids[]" multiple size="5" style="min-width:16em;">
+                            <?php foreach ($students as $student) : ?>
+                                <option value="<?php echo esc_attr((string) $student['id']); ?>"><?php echo esc_html($student['name']); ?></option>
+                            <?php endforeach; ?>
+                        </select>
+                        <p>
+                            <button type="submit" name="usc_action" value="grant_access" class="button"><?php esc_html_e('Grant access', 'unsupervised-schedular'); ?></button>
+                        </p>
+                    </form>
+
+                    <form method="post">
+                        <?php wp_nonce_field('usc_group_action'); ?>
+                        <input type="hidden" name="offering_id" value="<?php echo esc_attr((string) $class['id']); ?>">
+                        <h4><?php esc_html_e('Invite by email', 'unsupervised-schedular'); ?></h4>
+                        <p class="description"><?php esc_html_e('For someone without an account yet.', 'unsupervised-schedular'); ?></p>
+                        <input type="email" name="email" class="regular-text" placeholder="<?php esc_attr_e('[email protected]', 'unsupervised-schedular'); ?>">
+                        <p>
+                            <button type="submit" name="usc_action" value="invite_email" class="button"><?php esc_html_e('Send invite', 'unsupervised-schedular'); ?></button>
+                        </p>
+                    </form>
+                </div>
+            <?php endif; ?>
         <?php endforeach; ?>
     <?php endif; ?>
 </div>

templates/admin/offerings.php

@@ -110,6 +110,13 @@ if ($editing && null !== $editing->termStart && null !== $editing->termEnd && $e
                     <p class="description"><?php esc_html_e('How many hours before a lesson a student may still cancel it. Leave blank to use the studio default; 0 lets students cancel any time.', 'unsupervised-schedular'); ?></p>
                 </td>
             </tr>
+            <tr>
+                <th><?php esc_html_e('Invite only', 'unsupervised-schedular'); ?></th>
+                <td>
+                    <label><input type="checkbox" name="invite_only" value="1" <?php echo $editing && $editing->isInviteOnly() ? 'checked' : ''; ?>> <?php esc_html_e('Hide from the booking list — students join by invitation only (group classes)', 'unsupervised-schedular'); ?></label>
+                    <p class="description"><?php esc_html_e('Invite-only classes never appear in the student catalog. Add or invite students from My Lessons → My Group Classes.', 'unsupervised-schedular'); ?></p>
+                </td>
+            </tr>
             <tr>
                 <th><?php esc_html_e('Active', 'unsupervised-schedular'); ?></th>
                 <td><label><input type="checkbox" name="is_active" value="1" <?php echo null === $editing || $editing->isActive ? 'checked' : ''; ?>> <?php esc_html_e('Open for registration', 'unsupervised-schedular'); ?></label></td>
@@ -144,7 +151,12 @@ if ($editing && null !== $editing->termStart && null !== $editing->termEnd && $e
                 <?php foreach ($offerings as $offering) : ?>
                     <tr>
                         <td><?php echo esc_html((string) $offering->id); ?></td>
-                        <td><?php echo esc_html($offering->title); ?></td>
+                        <td>
+                            <?php echo esc_html($offering->title); ?>
+                            <?php if ($offering->isInviteOnly()) : ?>
+                                <span class="dashicons dashicons-lock" title="<?php esc_attr_e('Invite only', 'unsupervised-schedular'); ?>"></span>
+                            <?php endif; ?>
+                        </td>
                         <td><?php echo esc_html($offering->kind); ?></td>
                         <td><?php echo $offering->durationMinutes ? esc_html((string) $offering->durationMinutes . ' min') : '&mdash;'; ?></td>
                         <td><?php echo esc_html(number_format($offering->price, 2) . ' ' . $offering->currency); ?></td>

tests/Unit/Auth/InviteRepositoryTest.php

@@ -35,11 +35,12 @@ class InviteRepositoryTest extends TestCase
                     return $d['email'] === '[email protected]'
                         && $d['token'] === 'tok123'
                         && $d['kind'] === Invite::KIND_PERSONAL
+                        && $d['offering_id'] === null
                         && $d['status'] === Invite::STATUS_PENDING
                         && $d['invited_by'] === 2
                         && $d['expires_at'] === null;
                 }),
-                ['%s', '%s', '%s', '%s', '%s', '%d', '%d', '%s', '%s', '%s']
+                ['%s', '%s', '%s', '%s', '%d', '%s', '%d', '%d', '%s', '%s', '%s']
             );
         $this->db->insert_id = 5;
 

tests/Unit/Auth/InviteTest.php

@@ -155,8 +155,42 @@ class InviteTest extends TestCase
     {
         $arr = (new Invite('[email protected]', 'tok', id: 1))->toArray();
 
-        foreach (['id', 'email', 'token', 'role', 'kind', 'status', 'invited_by', 'accepted_user_id', 'accepted_at', 'expires_at'] as $key) {
+        foreach (['id', 'email', 'token', 'role', 'kind', 'status', 'invited_by', 'accepted_user_id', 'accepted_at', 'expires_at', 'offering_id'] as $key) {
             self::assertArrayHasKey($key, $arr);
         }
     }
+
+    public function testOfferingIdRoundTrips(): void
+    {
+        $invite = Invite::fromRow((object) [
+            'id'               => '5',
+            'email'            => '[email protected]',
+            'token'            => 'tok123',
+            'role'             => RoleManager::STUDENT,
+            'status'           => Invite::STATUS_PENDING,
+            'invited_by'       => '2',
+            'accepted_user_id' => null,
+            'accepted_at'      => null,
+            'offering_id'      => '8',
+        ]);
+
+        self::assertSame(8, $invite->offeringId);
+        self::assertSame(8, $invite->toArray()['offering_id']);
+    }
+
+    public function testOfferingIdDefaultsToNullWhenColumnMissing(): void
+    {
+        $invite = Invite::fromRow((object) [
+            'id'               => '5',
+            'email'            => '[email protected]',
+            'token'            => 'tok123',
+            'role'             => RoleManager::STUDENT,
+            'status'           => Invite::STATUS_PENDING,
+            'invited_by'       => null,
+            'accepted_user_id' => null,
+            'accepted_at'      => null,
+        ]);
+
+        self::assertNull($invite->offeringId);
+    }
 }

tests/Unit/Auth/RegistrationMailerTest.php

@@ -81,4 +81,42 @@ class RegistrationMailerTest extends TestCase
     {
         self::assertFalse((new RegistrationMailer())->sendRejected(''));
     }
+
+    public function testSendClassAccessGrantedEmailsTheStudent(): void
+    {
+        Functions\expect('wp_mail')
+            ->once()
+            ->with(
+                '[email protected]',
+                Mockery::on(static fn (string $subject): bool => str_contains($subject, 'Choir')),
+                Mockery::on(static fn (string $body): bool => str_contains($body, 'Choir'))
+            )
+            ->andReturn(true);
+
+        self::assertTrue((new RegistrationMailer())->sendClassAccessGranted($this->user('[email protected]'), 'Choir'));
+    }
+
+    public function testSendClassAccessGrantedReturnsFalseWithoutRecipient(): void
+    {
+        self::assertFalse((new RegistrationMailer())->sendClassAccessGranted($this->user(''), 'Choir'));
+    }
+
+    public function testSendClassInviteIncludesTheLink(): void
+    {
+        Functions\expect('wp_mail')
+            ->once()
+            ->with(
+                '[email protected]',
+                Mockery::type('string'),
+                Mockery::on(static fn (string $body): bool => str_contains($body, 'http://join.test'))
+            )
+            ->andReturn(true);
+
+        self::assertTrue((new RegistrationMailer())->sendClassInvite('[email protected]', 'http://join.test', 'Choir'));
+    }
+
+    public function testSendClassInviteReturnsFalseWithoutRecipient(): void
+    {
+        self::assertFalse((new RegistrationMailer())->sendClassInvite('', 'http://join.test', 'Choir'));
+    }
 }

tests/Unit/Auth/RegistrationPageTest.php

@@ -9,6 +9,7 @@ use Unsupervised\Schedular\Auth\Invite;
 use Unsupervised\Schedular\Auth\InviteRepository;
 use Unsupervised\Schedular\Auth\RegistrationMailer;
 use Unsupervised\Schedular\Auth\RegistrationPage;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
 use Unsupervised\Schedular\Payment\StudioSettings;
 use Unsupervised\Schedular\Policy\AcceptanceRepository;
 use Unsupervised\Schedular\Policy\Policy;
@@ -45,11 +46,15 @@ class RegistrationPageTest extends TestCase
         $questions->shouldReceive('findByScope')->andReturn([])->byDefault();
         $answers->shouldReceive('insert')->andReturn(1)->byDefault();
 
+        $access = Mockery::mock(GroupAccessRepository::class);
+        $access->shouldReceive('linkStudentByEmail')->andReturn(true)->byDefault();
+
         $this->ctx = [
             'invites'   => $invites,
             'policies'  => $policies,
             'questions' => $questions,
             'answers'   => $answers,
+            'access'    => $access,
             'mailer'    => Mockery::mock(RegistrationMailer::class),
             'settings'  => Mockery::mock(StudioSettings::class),
         ];
@@ -63,6 +68,7 @@ class RegistrationPageTest extends TestCase
             $this->ctx['mailer'],
             $questions,
             $answers,
+            $access,
         );
 
         $_POST = [];
@@ -110,6 +116,26 @@ class RegistrationPageTest extends TestCase
         self::assertSame('invite', $this->submit($invite, false));
     }
 
+    public function testInviteAcceptanceLinksClassGrantForTheEmail(): void
+    {
+        $_POST = [ 'password' => 'password123', 'display_name' => 'Ada' ];
+
+        Functions\when('email_exists')->justReturn(false);
+        Functions\when('wp_insert_user')->justReturn(42);
+        Functions\when('is_wp_error')->justReturn(false);
+
+        $this->ctx['invites']->shouldReceive('markAccepted')->once();
+        Functions\when('wp_set_current_user')->justReturn(null);
+        Functions\when('wp_set_auth_cookie')->justReturn(null);
+
+        // A personal invite tied to a class grant links the new account to it.
+        $this->ctx['access']->shouldReceive('linkStudentByEmail')->once()->with('[email protected]', 42)->andReturn(true);
+
+        $invite = new Invite(email: '[email protected]', token: 'hash', offeringId: 8);
+
+        self::assertSame('invite', $this->submit($invite, false));
+    }
+
     public function testOpenBranchCreatesPendingWithoutLoginAndEmails(): void
     {
         $_POST = [ 'password' => 'password123', 'display_name' => 'Ada', 'email' => '[email protected]' ];

tests/Unit/GroupClass/EnrollmentEndpointTest.php

@@ -7,6 +7,7 @@ use Brain\Monkey\Functions;
 use Mockery;
 use Unsupervised\Schedular\GroupClass\EnrollmentEndpoint;
 use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
 use Unsupervised\Schedular\Offering\Offering;
 use Unsupervised\Schedular\Offering\OfferingRepository;
 use Unsupervised\Schedular\Payment\Payment;
@@ -20,6 +21,7 @@ class EnrollmentEndpointTest extends TestCase
     private OfferingRepository $offerings;
     private RegistrationGate $gate;
     private PaymentService $payments;
+    private GroupAccessRepository $access;
     private EnrollmentEndpoint $endpoint;
 
     protected function setUp(): void
@@ -35,12 +37,14 @@ class EnrollmentEndpointTest extends TestCase
         $this->offerings   = Mockery::mock(OfferingRepository::class);
         $this->gate        = Mockery::mock(RegistrationGate::class);
         $this->payments    = Mockery::mock(PaymentService::class);
+        $this->access      = Mockery::mock(GroupAccessRepository::class);
 
         $this->endpoint = new EnrollmentEndpoint(
             $this->enrollments,
             $this->offerings,
             $this->gate,
             $this->payments,
+            $this->access,
         );
     }
 
@@ -49,6 +53,11 @@ class EnrollmentEndpointTest extends TestCase
         return new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: 'Choir', price: $price, id: 8);
     }
 
+    private function inviteOnlyOffering(): Offering
+    {
+        return new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: 'Private Choir', accessMode: Offering::ACCESS_INVITE_ONLY, id: 8);
+    }
+
     private function expectSuccessfulEnrollment(): void
     {
         $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 5)->andReturn(false);
@@ -98,4 +107,31 @@ class EnrollmentEndpointTest extends TestCase
             $result->get_data()['payment']
         );
     }
+
+    public function testInviteOnlyClassRejectsStudentWithoutGrant(): void
+    {
+        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering());
+        $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 5)->andReturn(false);
+        $this->access->shouldReceive('hasGrant')->with(8, 5)->andReturn(false);
+        $this->enrollments->shouldReceive('insert')->never();
+
+        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));
+
+        self::assertInstanceOf(\WP_Error::class, $result);
+        self::assertSame('invite_required', $result->get_error_code());
+        self::assertSame(403, $result->error_data['invite_required']['status']);
+    }
+
+    public function testInviteOnlyClassAllowsGrantedStudentAndMarksEnrolled(): void
+    {
+        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering());
+        $this->access->shouldReceive('hasGrant')->with(8, 5)->andReturn(true);
+        $this->expectSuccessfulEnrollment();
+        $this->access->shouldReceive('markEnrolled')->once()->with(8, 5);
+
+        $result = $this->endpoint->enroll(new \WP_REST_Request(['offering_id' => 8]));
+
+        self::assertInstanceOf(\WP_REST_Response::class, $result);
+        self::assertSame(201, $result->get_status());
+    }
 }

tests/Unit/GroupClass/GroupAccessRepositoryTest.php

@@ -0,0 +1,158 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Tests\Unit\GroupClass;
+
+use Brain\Monkey\Functions;
+use Mockery;
+use Unsupervised\Schedular\GroupClass\GroupAccess;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
+use Unsupervised\Schedular\Tests\Unit\TestCase;
+
+class GroupAccessRepositoryTest extends TestCase
+{
+    private \wpdb $db;
+    private GroupAccessRepository $repo;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->db         = Mockery::mock(\wpdb::class);
+        $this->db->prefix = 'wp_';
+        $this->repo       = new GroupAccessRepository($this->db);
+    }
+
+    public function testInsertReturnsId(): void
+    {
+        Functions\expect('current_time')->with('mysql')->andReturn('2026-06-02 09:00:00');
+
+        $this->db->shouldReceive('insert')
+            ->once()
+            ->with(
+                'wp_us_group_access',
+                Mockery::on(static function (array $d): bool {
+                    return $d['offering_id'] === 8
+                        && $d['student_id'] === 5
+                        && $d['status'] === GroupAccess::STATUS_INVITED;
+                }),
+                ['%d', '%d', '%s', '%d', '%s', '%d', '%s']
+            );
+        $this->db->insert_id = 3;
+
+        self::assertSame(3, $this->repo->insert(new GroupAccess(offeringId: 8, studentId: 5, invitedBy: 2)));
+    }
+
+    public function testHasGrantTrueWhenCountPositive(): void
+    {
+        $this->db->shouldReceive('prepare')
+            ->once()
+            ->with(
+                Mockery::pattern('/offering_id = %d AND student_id = %d AND status IN/'),
+                'wp_us_group_access',
+                8,
+                5,
+                GroupAccess::STATUS_INVITED,
+                GroupAccess::STATUS_ENROLLED
+            )
+            ->andReturn('SELECT ...');
+        $this->db->shouldReceive('get_var')->andReturn('1');
+
+        self::assertTrue($this->repo->hasGrant(8, 5));
+    }
+
+    public function testHasGrantFalseWhenZero(): void
+    {
+        $this->db->shouldReceive('prepare')->andReturn('SELECT ...');
+        $this->db->shouldReceive('get_var')->andReturn('0');
+
+        self::assertFalse($this->repo->hasGrant(8, 5));
+    }
+
+    public function testFindGrantedOfferingIdsReturnsInts(): void
+    {
+        $this->db->shouldReceive('prepare')
+            ->once()
+            ->with(
+                Mockery::pattern('/DISTINCT offering_id.*student_id = %d/s'),
+                'wp_us_group_access',
+                5,
+                GroupAccess::STATUS_INVITED,
+                GroupAccess::STATUS_ENROLLED
+            )
+            ->andReturn('SELECT ...');
+        $this->db->shouldReceive('get_col')->andReturn(['8', '9']);
+
+        self::assertSame([8, 9], $this->repo->findGrantedOfferingIds(5));
+    }
+
+    public function testFindByOfferingMapsRows(): void
+    {
+        $this->db->shouldReceive('prepare')->andReturn('SELECT ...');
+        $this->db->shouldReceive('get_results')->andReturn([
+            (object) [
+                'id'          => '1',
+                'offering_id' => '8',
+                'student_id'  => '5',
+                'email'       => '',
+                'invite_id'   => null,
+                'status'      => GroupAccess::STATUS_INVITED,
+                'invited_by'  => '2',
+            ],
+        ]);
+
+        $grants = $this->repo->findByOffering(8);
+
+        self::assertCount(1, $grants);
+        self::assertSame(5, $grants[0]->studentId);
+    }
+
+    public function testLinkStudentByEmailUpdatesNullStudentRows(): void
+    {
+        $this->db->shouldReceive('prepare')
+            ->once()
+            ->with(
+                Mockery::pattern('/UPDATE %i SET student_id = %d WHERE email = %s AND student_id IS NULL/'),
+                'wp_us_group_access',
+                5,
+                '[email protected]'
+            )
+            ->andReturn('UPDATE ...');
+        $this->db->shouldReceive('query')->once()->with('UPDATE ...')->andReturn(1);
+
+        self::assertTrue($this->repo->linkStudentByEmail('[email protected]', 5));
+    }
+
+    public function testLinkStudentByEmailIgnoresEmptyEmail(): void
+    {
+        $this->db->shouldReceive('prepare')->never();
+
+        self::assertFalse($this->repo->linkStudentByEmail('', 5));
+    }
+
+    public function testMarkEnrolledUpdatesStatus(): void
+    {
+        $this->db->shouldReceive('update')
+            ->once()
+            ->with(
+                'wp_us_group_access',
+                ['status' => GroupAccess::STATUS_ENROLLED],
+                ['offering_id' => 8, 'student_id' => 5],
+                ['%s'],
+                ['%d', '%d']
+            )
+            ->andReturn(1);
+
+        self::assertTrue($this->repo->markEnrolled(8, 5));
+    }
+
+    public function testRevokeUpdatesStatus(): void
+    {
+        $this->db->shouldReceive('update')
+            ->once()
+            ->with('wp_us_group_access', ['status' => GroupAccess::STATUS_REVOKED], ['id' => 3], ['%s'], ['%d'])
+            ->andReturn(1);
+
+        self::assertTrue($this->repo->revoke(3));
+    }
+}

tests/Unit/GroupClass/GroupAccessTest.php

@@ -0,0 +1,70 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Tests\Unit\GroupClass;
+
+use Unsupervised\Schedular\GroupClass\GroupAccess;
+use Unsupervised\Schedular\Tests\Unit\TestCase;
+
+class GroupAccessTest extends TestCase
+{
+    public function testDefaultsToInvitedStatusAndNullStudent(): void
+    {
+        $access = new GroupAccess(offeringId: 8);
+
+        self::assertSame(GroupAccess::STATUS_INVITED, $access->status);
+        self::assertNull($access->studentId);
+        self::assertSame('', $access->email);
+    }
+
+    public function testFromRowMapsColumns(): void
+    {
+        $row = (object) [
+            'id'          => '3',
+            'offering_id' => '8',
+            'student_id'  => '5',
+            'email'       => '[email protected]',
+            'invite_id'   => '9',
+            'status'      => GroupAccess::STATUS_ENROLLED,
+            'invited_by'  => '2',
+        ];
+
+        $access = GroupAccess::fromRow($row);
+
+        self::assertSame(3, $access->id);
+        self::assertSame(8, $access->offeringId);
+        self::assertSame(5, $access->studentId);
+        self::assertSame('[email protected]', $access->email);
+        self::assertSame(9, $access->inviteId);
+        self::assertSame(GroupAccess::STATUS_ENROLLED, $access->status);
+        self::assertSame(2, $access->invitedBy);
+    }
+
+    public function testFromRowCastsNullStudentAndInvite(): void
+    {
+        $row = (object) [
+            'id'          => '3',
+            'offering_id' => '8',
+            'student_id'  => null,
+            'email'       => '[email protected]',
+            'invite_id'   => null,
+            'status'      => GroupAccess::STATUS_INVITED,
+            'invited_by'  => null,
+        ];
+
+        $access = GroupAccess::fromRow($row);
+
+        self::assertNull($access->studentId);
+        self::assertNull($access->inviteId);
+        self::assertNull($access->invitedBy);
+    }
+
+    public function testToArrayContainsExpectedKeys(): void
+    {
+        $arr = (new GroupAccess(offeringId: 8, studentId: 5, id: 3))->toArray();
+
+        foreach (['id', 'offering_id', 'student_id', 'email', 'invite_id', 'status', 'invited_by'] as $key) {
+            self::assertArrayHasKey($key, $arr);
+        }
+    }
+}

tests/Unit/GroupClass/GroupClassControllerTest.php

@@ -5,13 +5,17 @@ namespace Unsupervised\Schedular\Tests\Unit\GroupClass;
 
 use Brain\Monkey\Functions;
 use Mockery;
+use Unsupervised\Schedular\Auth\InviteRepository;
+use Unsupervised\Schedular\Auth\RegistrationMailer;
 use Unsupervised\Schedular\GroupClass\Enrollment;
 use Unsupervised\Schedular\GroupClass\EnrollmentRepository;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
 use Unsupervised\Schedular\GroupClass\GroupClassController;
 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\Tests\Unit\TestCase;
 
 class GroupClassControllerTest extends TestCase
@@ -19,6 +23,10 @@ class GroupClassControllerTest extends TestCase
     private EnrollmentRepository&Mockery\MockInterface $enrollments;
     private OfferingRepository&Mockery\MockInterface $offerings;
     private PaymentRepository&Mockery\MockInterface $payments;
+    private GroupAccessRepository&Mockery\MockInterface $access;
+    private PaymentService&Mockery\MockInterface $paymentService;
+    private InviteRepository&Mockery\MockInterface $invites;
+    private RegistrationMailer&Mockery\MockInterface $mailer;
     private GroupClassController $controller;
 
     protected function setUp(): void
@@ -28,10 +36,25 @@ class GroupClassControllerTest extends TestCase
         $this->enrollments    = Mockery::mock(EnrollmentRepository::class);
         $this->offerings      = Mockery::mock(OfferingRepository::class);
         $this->payments       = Mockery::mock(PaymentRepository::class);
-        $this->controller  = new GroupClassController($this->enrollments, $this->offerings, $this->payments);
+        $this->access         = Mockery::mock(GroupAccessRepository::class);
+        $this->paymentService = Mockery::mock(PaymentService::class);
+        $this->invites        = Mockery::mock(InviteRepository::class);
+        $this->mailer         = Mockery::mock(RegistrationMailer::class);
+        $this->controller     = new GroupClassController(
+            $this->enrollments,
+            $this->offerings,
+            $this->payments,
+            $this->access,
+            $this->paymentService,
+            $this->invites,
+            $this->mailer,
+        );
 
         Functions\when('current_user_can')->justReturn(true);
         Functions\when('get_current_user_id')->justReturn(3);
+        Functions\when('get_users')->justReturn([]);
+        Functions\when('esc_attr')->returnArg();
+        Functions\when('esc_attr_e')->returnArg();
     }
 
     private function offering(int $id, string $title, ?int $capacity): Offering
@@ -157,4 +180,170 @@ class GroupClassControllerTest extends TestCase
 
         $this->controller->renderInstructorPage();
     }
+
+    protected function tearDown(): void
+    {
+        $_POST = [];
+        parent::tearDown();
+    }
+
+    private function inviteOnlyOffering(float $price = 0.0): Offering
+    {
+        return new Offering(
+            instructorId: 3,
+            kind:         Offering::KIND_GROUP_CLASS,
+            title:        'Private Choir',
+            price:        $price,
+            accessMode:   Offering::ACCESS_INVITE_ONLY,
+            id:           8,
+        );
+    }
+
+    /** Stub the form-processing helpers and the render tail shared by all action tests. */
+    private function stubActionContext(): void
+    {
+        Functions\when('check_admin_referer')->justReturn(true);
+        Functions\when('sanitize_key')->alias(static fn ($v) => strtolower((string) $v));
+        Functions\when('wp_unslash')->returnArg();
+        Functions\when('sanitize_email')->returnArg();
+        Functions\when('absint')->alias(static fn ($v) => abs((int) $v));
+
+        // Render tail: no classes/enrolments to draw so the assertion targets the notice.
+        $this->offerings->shouldReceive('findAll')->with(3, Offering::KIND_GROUP_CLASS)->andReturn([]);
+        $this->enrollments->shouldReceive('findByInstructor')->with(3)->andReturn([]);
+    }
+
+    public function testAddDirectEnrolsStudentWithPendingPayment(): void
+    {
+        $_POST = ['usc_action' => 'add_direct', 'offering_id' => 8, 'student_ids' => [5]];
+        $this->stubActionContext();
+
+        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering(100.0));
+        $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 5)->andReturn(false);
+        $this->enrollments->shouldReceive('insert')->once()->andReturn(44);
+
+        $payment = new Payment(
+            studentId:        5,
+            instructorId:     3,
+            registrationType: Payment::REG_ENROLLMENT,
+            registrationId:   44,
+            amount:           100.0,
+            method:           Payment::METHOD_ETRANSFER,
+            status:           Payment::STATUS_PENDING,
+            id:               12,
+        );
+        $this->paymentService->shouldReceive('createForRegistration')
+            ->once()
+            ->with(Payment::REG_ENROLLMENT, 44, 5, 3, 100.0, 'CAD', null)
+            ->andReturn($payment);
+        $this->enrollments->shouldReceive('setPaymentId')->once()->with(44, 12)->andReturn(true);
+        $this->access->shouldReceive('markEnrolled')->once()->with(8, 5);
+
+        $html = $this->renderInstructor();
+
+        self::assertStringContainsString('1 student(s) added to the class.', $html);
+    }
+
+    public function testGrantAccessCreatesGrantAndEmailsStudent(): void
+    {
+        $_POST = ['usc_action' => 'grant_access', 'offering_id' => 8, 'student_ids' => [5]];
+        $this->stubActionContext();
+
+        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering());
+        $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 5)->andReturn(false);
+        $this->access->shouldReceive('hasGrant')->with(8, 5)->andReturn(false);
+        $this->access->shouldReceive('insert')->once()->andReturn(1);
+
+        $user = Mockery::mock(\WP_User::class);
+        $user->user_email = '[email protected]';
+        Functions\when('get_userdata')->justReturn($user);
+        $this->mailer->shouldReceive('sendClassAccessGranted')->once()->with($user, 'Private Choir')->andReturn(true);
+
+        $html = $this->renderInstructor();
+
+        self::assertStringContainsString('1 student(s) granted access.', $html);
+    }
+
+    public function testInviteEmailForNewAddressCreatesInviteAndSendsLink(): void
+    {
+        $_POST = ['usc_action' => 'invite_email', 'offering_id' => 8, 'email' => '[email protected]'];
+        $this->stubActionContext();
+
+        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering());
+        Functions\when('is_email')->justReturn(true);
+        Functions\when('email_exists')->justReturn(false);
+        $this->invites->shouldReceive('findPendingByEmail')->with('[email protected]')->andReturn(null);
+        Functions\when('wp_generate_password')->justReturn('rawtoken');
+        Functions\when('get_option')->justReturn(0);
+        Functions\when('home_url')->justReturn('http://home.test/');
+        Functions\when('add_query_arg')->justReturn('http://home.test/?us_invite=rawtoken');
+
+        $this->invites->shouldReceive('insert')->once()->andReturn(7);
+        $this->access->shouldReceive('insert')->once()->andReturn(2);
+        $this->mailer->shouldReceive('sendClassInvite')->once()->with('[email protected]', 'http://home.test/?us_invite=rawtoken', 'Private Choir')->andReturn(true);
+
+        $html = $this->renderInstructor();
+
+        self::assertStringContainsString('Invitation sent.', $html);
+    }
+
+    public function testInviteEmailReusesPendingInviteWithoutSendingLink(): void
+    {
+        $_POST = ['usc_action' => 'invite_email', 'offering_id' => 8, 'email' => '[email protected]'];
+        $this->stubActionContext();
+
+        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering());
+        Functions\when('is_email')->justReturn(true);
+        Functions\when('email_exists')->justReturn(false);
+        $this->invites->shouldReceive('findPendingByEmail')->with('[email protected]')->andReturn(
+            new \Unsupervised\Schedular\Auth\Invite(email: '[email protected]', token: 'hash', id: 9)
+        );
+
+        // No new invite row and no email — just a grant attached to the existing invite.
+        $this->invites->shouldReceive('insert')->never();
+        $this->mailer->shouldReceive('sendClassInvite')->never();
+        $this->access->shouldReceive('insert')->once()->andReturn(2);
+
+        $html = $this->renderInstructor();
+
+        self::assertStringContainsString('No new link was sent.', $html);
+    }
+
+    public function testInviteEmailForExistingAccountGrantsAccess(): void
+    {
+        $_POST = ['usc_action' => 'invite_email', 'offering_id' => 8, 'email' => '[email protected]'];
+        $this->stubActionContext();
+
+        $this->offerings->shouldReceive('findById')->with(8)->andReturn($this->inviteOnlyOffering());
+        Functions\when('is_email')->justReturn(true);
+        Functions\when('email_exists')->justReturn(55);
+
+        $this->enrollments->shouldReceive('hasActiveEnrollment')->with(8, 55)->andReturn(false);
+        $this->access->shouldReceive('hasGrant')->with(8, 55)->andReturn(false);
+        $this->access->shouldReceive('insert')->once()->andReturn(3);
+
+        $user = Mockery::mock(\WP_User::class);
+        $user->user_email = '[email protected]';
+        Functions\when('get_userdata')->justReturn($user);
+        $this->mailer->shouldReceive('sendClassAccessGranted')->once()->andReturn(true);
+
+        $html = $this->renderInstructor();
+
+        self::assertStringContainsString('1 student(s) granted access.', $html);
+    }
+
+    public function testActionRejectedForClassNotOwnedByInstructor(): void
+    {
+        $_POST = ['usc_action' => 'add_direct', 'offering_id' => 8, 'student_ids' => [5]];
+        $this->stubActionContext();
+
+        // Offering owned by a different instructor (7, not the current user 3).
+        $foreign = new Offering(instructorId: 7, kind: Offering::KIND_GROUP_CLASS, title: 'Other', accessMode: Offering::ACCESS_INVITE_ONLY, id: 8);
+        $this->offerings->shouldReceive('findById')->with(8)->andReturn($foreign);
+        $this->enrollments->shouldReceive('insert')->never();
+
+        $html = $this->renderInstructor();
+
+        self::assertStringContainsString('That group class was not found.', $html);
+    }
 }

tests/Unit/Offering/OfferingControllerTest.php

@@ -70,6 +70,39 @@ class OfferingControllerTest extends TestCase
         $this->render();
     }
 
+    public function testAddInviteOnlyGroupClassStoresInviteOnlyAccess(): void
+    {
+        $_POST = [
+            'usc_action'  => 'add',
+            'title'       => 'Private Choir',
+            'kind'        => Offering::KIND_GROUP_CLASS,
+            'invite_only' => '1',
+        ];
+
+        $this->repository->shouldReceive('insert')->once()->with(Mockery::on(
+            static fn (Offering $o) => Offering::ACCESS_INVITE_ONLY === $o->accessMode
+        ))->andReturn(1);
+        $this->repository->shouldReceive('findAll')->andReturn([]);
+
+        $this->render();
+    }
+
+    public function testAddWithoutInviteOnlyDefaultsToPublicAccess(): void
+    {
+        $_POST = [
+            'usc_action' => 'add',
+            'title'      => 'Open Choir',
+            'kind'       => Offering::KIND_GROUP_CLASS,
+        ];
+
+        $this->repository->shouldReceive('insert')->once()->with(Mockery::on(
+            static fn (Offering $o) => Offering::ACCESS_PUBLIC === $o->accessMode
+        ))->andReturn(1);
+        $this->repository->shouldReceive('findAll')->andReturn([]);
+
+        $this->render();
+    }
+
     public function testAddOneOffGroupClassEndsOnItsStartDate(): void
     {
         $_POST = [

tests/Unit/Offering/OfferingEndpointTest.php

@@ -0,0 +1,102 @@
+<?php
+declare(strict_types=1);
+
+namespace Unsupervised\Schedular\Tests\Unit\Offering;
+
+use Brain\Monkey\Functions;
+use Mockery;
+use Unsupervised\Schedular\GroupClass\GroupAccessRepository;
+use Unsupervised\Schedular\Offering\Offering;
+use Unsupervised\Schedular\Offering\OfferingEndpoint;
+use Unsupervised\Schedular\Offering\OfferingRepository;
+use Unsupervised\Schedular\Tests\Unit\TestCase;
+
+class OfferingEndpointTest extends TestCase
+{
+    private OfferingRepository&Mockery\MockInterface $repository;
+    private GroupAccessRepository&Mockery\MockInterface $access;
+    private OfferingEndpoint $endpoint;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        Functions\when('get_current_user_id')->justReturn(5);
+
+        $this->repository = Mockery::mock(OfferingRepository::class);
+        $this->access     = Mockery::mock(GroupAccessRepository::class);
+        $this->endpoint   = new OfferingEndpoint($this->repository, $this->access);
+    }
+
+    private function group(int $id, string $access): Offering
+    {
+        return new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: "Class $id", accessMode: $access, id: $id);
+    }
+
+    public function testIndexReturnsPublicOfferingsOnlyWhenNoGrants(): void
+    {
+        $this->repository->shouldReceive('findAll')
+            ->once()
+            ->with(0, '', Mockery::on(static fn ($v): bool => true === $v), Offering::ACCESS_PUBLIC)
+            ->andReturn([$this->group(1, Offering::ACCESS_PUBLIC)]);
+        $this->access->shouldReceive('findGrantedOfferingIds')->with(5)->andReturn([]);
+
+        $data = $this->endpoint->index(new \WP_REST_Request())->get_data();
+
+        self::assertCount(1, $data);
+        self::assertSame(1, $data[0]['id']);
+    }
+
+    public function testIndexMergesGrantedInviteOnlyOfferings(): void
+    {
+        $this->repository->shouldReceive('findAll')
+            ->once()
+            ->with(0, '', Mockery::any(), Offering::ACCESS_PUBLIC)
+            ->andReturn([$this->group(1, Offering::ACCESS_PUBLIC)]);
+        $this->access->shouldReceive('findGrantedOfferingIds')->with(5)->andReturn([8]);
+        $this->repository->shouldReceive('findById')->with(8)->andReturn($this->group(8, Offering::ACCESS_INVITE_ONLY));
+
+        $data = $this->endpoint->index(new \WP_REST_Request())->get_data();
+
+        self::assertSame([1, 8], array_column($data, 'id'));
+    }
+
+    public function testIndexOmitsGrantedOfferingThatIsNoLongerInviteOnly(): void
+    {
+        $this->repository->shouldReceive('findAll')->andReturn([]);
+        $this->access->shouldReceive('findGrantedOfferingIds')->with(5)->andReturn([8]);
+        // Grant persists but the class was flipped back to public — it is already
+        // in the public list, so it must not be appended a second time.
+        $this->repository->shouldReceive('findById')->with(8)->andReturn($this->group(8, Offering::ACCESS_PUBLIC));
+
+        $data = $this->endpoint->index(new \WP_REST_Request())->get_data();
+
+        self::assertSame([], $data);
+    }
+
+    public function testIndexRespectsKindFilterForGrantedOfferings(): void
+    {
+        $this->repository->shouldReceive('findAll')
+            ->with(0, Offering::KIND_PRIVATE_LESSON, Mockery::any(), Offering::ACCESS_PUBLIC)
+            ->andReturn([]);
+        $this->access->shouldReceive('findGrantedOfferingIds')->with(5)->andReturn([8]);
+        // Granted class is a group class; the request filters to private lessons.
+        $this->repository->shouldReceive('findById')->with(8)->andReturn($this->group(8, Offering::ACCESS_INVITE_ONLY));
+
+        $data = $this->endpoint->index(new \WP_REST_Request(['kind' => Offering::KIND_PRIVATE_LESSON]))->get_data();
+
+        self::assertSame([], $data);
+    }
+
+    public function testIndexOmitsEtransferEmailFromPublicListing(): void
+    {
+        $this->repository->shouldReceive('findAll')->andReturn([
+            new Offering(instructorId: 3, kind: Offering::KIND_GROUP_CLASS, title: 'Choir', etransferEmail: '[email protected]', id: 1),
+        ]);
+        $this->access->shouldReceive('findGrantedOfferingIds')->with(5)->andReturn([]);
+
+        $data = $this->endpoint->index(new \WP_REST_Request())->get_data();
+
+        self::assertArrayNotHasKey('etransfer_email', $data[0]);
+    }
+}

tests/Unit/Offering/OfferingRepositoryTest.php

@@ -154,6 +154,44 @@ class OfferingRepositoryTest extends TestCase
         $this->repo->findAll(3, Offering::KIND_GROUP_CLASS);
     }
 
+    public function testFindAllFiltersByAccessMode(): void
+    {
+        $this->db->shouldReceive('prepare')
+            ->once()
+            ->with(
+                Mockery::pattern('/access_mode = %s/'),
+                Mockery::on(static fn (array $p): bool => $p === ['wp_us_offerings', Offering::ACCESS_PUBLIC])
+            )
+            ->andReturn('SELECT ...');
+
+        $this->db->shouldReceive('get_results')->andReturn([]);
+
+        self::assertSame([], $this->repo->findAll(accessMode: Offering::ACCESS_PUBLIC));
+    }
+
+    public function testInsertPersistsAccessMode(): void
+    {
+        Functions\expect('current_time')->with('mysql')->andReturn('2026-04-01 12:00:00');
+
+        $this->db->shouldReceive('insert')
+            ->once()
+            ->with(
+                'wp_us_offerings',
+                Mockery::on(static fn (array $data): bool => $data['access_mode'] === Offering::ACCESS_INVITE_ONLY),
+                Mockery::type('array')
+            );
+        $this->db->insert_id = 1;
+
+        $offering = new Offering(
+            instructorId: 5,
+            kind:         Offering::KIND_GROUP_CLASS,
+            title:        'Private Choir',
+            accessMode:   Offering::ACCESS_INVITE_ONLY,
+        );
+
+        self::assertSame(1, $this->repo->insert($offering));
+    }
+
     public function testDeleteCallsWpdbDelete(): void
     {
         $this->db->shouldReceive('delete')

tests/Unit/Offering/OfferingTest.php

@@ -132,11 +132,53 @@ class OfferingTest extends TestCase
         $offering = new Offering(1, Offering::KIND_PRIVATE_LESSON, 'Lesson', id: 10);
         $arr      = $offering->toArray();
 
-        foreach (['id', 'instructor_id', 'kind', 'title', 'price', 'billing_mode', 'is_active'] as $key) {
+        foreach (['id', 'instructor_id', 'kind', 'title', 'price', 'billing_mode', 'access_mode', 'is_active'] as $key) {
             self::assertArrayHasKey($key, $arr);
         }
     }
 
+    public function testDefaultsToPublicAccess(): void
+    {
+        $offering = new Offering(1, Offering::KIND_GROUP_CLASS, 'Choir', id: 10);
+
+        self::assertSame(Offering::ACCESS_PUBLIC, $offering->accessMode);
+        self::assertFalse($offering->isInviteOnly());
+    }
+
+    public function testInviteOnlyAccessIsReported(): void
+    {
+        $offering = new Offering(1, Offering::KIND_GROUP_CLASS, 'Choir', accessMode: Offering::ACCESS_INVITE_ONLY, id: 10);
+
+        self::assertTrue($offering->isInviteOnly());
+        self::assertSame(Offering::ACCESS_INVITE_ONLY, $offering->toArray()['access_mode']);
+    }
+
+    public function testFromRowReadsInviteOnlyAccessMode(): void
+    {
+        $row = (object) [
+            'id'               => '7',
+            'instructor_id'    => '3',
+            'kind'             => Offering::KIND_GROUP_CLASS,
+            'title'            => 'Private Choir',
+            'description'      => null,
+            'duration_minutes' => null,
+            'price'            => '0.00',
+            'currency'         => 'CAD',
+            'billing_mode'     => Offering::BILLING_FULL_TERM,
+            'allow_weekly'     => '0',
+            'capacity'         => null,
+            'term_start'       => null,
+            'term_end'         => null,
+            'schedule_note'    => null,
+            'etransfer_email'  => null,
+            'cancellation_cutoff_hours' => null,
+            'access_mode'      => Offering::ACCESS_INVITE_ONLY,
+            'is_active'        => '1',
+        ];
+
+        self::assertTrue(Offering::fromRow($row)->isInviteOnly());
+    }
+
     public function testToArrayIncludesEtransferEmailByDefault(): void
     {
         $offering = new Offering(1, Offering::KIND_PRIVATE_LESSON, 'Lesson', etransferEmail: '[email protected]', id: 10);