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unsupervised-scheduler/docs/features/payments.md
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Credit students for cancelled paid lessons
Cancelling a lesson that was already paid for now credits the student
that money instead of leaving it as a manual refund, and the daily
scheduled-billing scan applies any available credit against their due
charges before emailing the notice.

- New us_credits ledger + us_payments.credit_applied column (Payment::netDue).
- PaymentService::creditForCancelledLesson issues a per-lesson share of the
  covering payment's total; wired into all three cancel paths (student
  self-cancel, instructor status update, admin student-detail cancel).
- PaymentService::applyCredits draws credit down FIFO across a run's charges,
  marking a fully-covered charge paid-by-credit; the notice shows the credit
  applied and reduced total, and the admin queue shows net due.
- Student detail page shows a student's credit balance and history.

Ships as part of the unreleased 1.2.0 (same release as scheduled billing).

Tests: composer test (585), composer lint, composer cs all pass.

Co-Authored-By: Claude Opus 4.8 <[email protected]>
2026-07-24 15:32:20 -03:00

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# Feature: Payments
## Overview
Payment is taken at registration. When Stripe is **not** configured the platform
falls back to **e-transfer** — a pending payment a studio admin marks received —
so everything works without any credentials. When Stripe **is** configured the
default rail becomes the **credit card**. The studio admin can override any
student's method (card / e-transfer / comp). Single bookings are charged once;
weekly reservations and group classes are charged the full term upfront (a
`full_term` price once, or a per-lesson `one_time` price × the occurrences
reserved — see `lesson-booking.md`). A
numbered receipt is emailed automatically when a payment is marked paid.
> **Implemented:** the payment ledger, studio settings, method resolution
> (e-transfer default with no Stripe; card default when configured; per-student
> override), the e-transfer/comp flow with admin confirmation + receipts,
> integration into booking/enrolment (a registration's `payment_id` is linked;
> comp auto-confirms; e-transfer stays pending until confirmed), and the **live
> Stripe card charge** — a PaymentIntent created on `POST /payments/intent`,
> confirmed in the browser with Stripe.js Payment Elements, and finalised by the
> `POST /payments/webhook` handler (signature-verified) on
> `payment_intent.succeeded`. Uses the `stripe/stripe-php` SDK.
## Stripe Configuration
Stripe credentials live in WordPress options, managed on the **Studio Settings**
page (`manage_billing`, studio admin only):
| Option | Notes |
|------------------------------|----------------------------------------|
| `us_stripe_publishable_key` | Stripe publishable key |
| `us_stripe_secret_key` | Stripe secret key |
| `us_stripe_webhook_secret` | Webhook signing secret (`whsec_…`) |
| `us_stripe_mode` | `test` or `live` |
| `us_currency` | Default ISO 4217 currency, e.g. `CAD` |
| `us_etransfer_email` | Studio-default e-transfer destination |
| `us_hst_rate` | Default HST/tax percentage, e.g. `13` |
## HST / Tax
A studio-default **HST rate** (percentage) is configured on **Studio Settings**
(`us_hst_rate`, `manage_billing`). At booking the rate is **frozen onto the
payment** (`us_payments.tax_rate`) and the tax is computed against the pre-tax
subtotal (`tax_amount = round(amount × rate / 100, 2)`). The billed total is
`amount + tax_amount` (`Payment::total()`). Comped registrations are never taxed
(rate and amount are 0).
The rate is overridable **per booking** on **My Lessons** (instructor) while the
payment is still unpaid; saving recomputes `tax_amount` from the current
subtotal (`PaymentRepository::updateTax`). Receipts break out subtotal, HST, and
total when tax applies.
## Per-Student Billing Method
Each student's billing method is stored in user meta `us_payment_method`, set by the
studio admin (`Students → student detail → Billing method`). When unset, the studio
default applies — `card` if Stripe is configured, otherwise `etransfer`
(`BillingMethodResolver`):
| Method | Behaviour |
|------------|-----------------------------------------------------------------------|
| `card` | Charged immediately via Stripe; payment `paid` on success |
| `etransfer`| Payment row created `pending`; admin marks it `paid` when funds arrive |
| `comp` | No charge; registration is confirmed immediately, no payment row required |
## E-transfer Destination Email
Where students send e-transfers is resolved and **frozen onto the payment** at
booking time (`us_payments.etransfer_email`), so each record keeps the destination
the student was given. Resolution at creation:
1. **Offering override**`us_offerings.etransfer_email`, set by the instructor on the offering.
2. **Studio default** — the `us_etransfer_email` option (Studio Settings, `manage_billing`).
After booking, the destination on a payment can be corrected per booking:
- **My Lessons** — the instructor edits the e-transfer email for a pending lesson payment.
- **Payments queue** — when marking an e-transfer received, the studio admin can update the email it was actually sent to before confirming.
## Data Model — `{prefix}us_payments`
| Column | Type | Notes |
|----------------------------|------------------|--------------------------------------------------------|
| `id` | BIGINT UNSIGNED | Primary key |
| `student_id` | BIGINT UNSIGNED | WordPress user ID |
| `instructor_id` | BIGINT UNSIGNED | WordPress user ID (denormalised for reporting) |
| `registration_type` | VARCHAR(20) | `lesson` or `enrollment` |
| `registration_id` | BIGINT UNSIGNED | FK → `us_lessons.id` or `us_group_enrollments.id` |
| `amount` | DECIMAL(10,2) | Charged amount in dollars (matches the offering price) |
| `currency` | VARCHAR(3) | ISO 4217, e.g. `CAD` |
| `method` | VARCHAR(20) | `card` / `etransfer` / `comp` |
| `status` | VARCHAR(20) | `pending` / `paid` / `failed` / `refunded` |
| `tax_rate` | DECIMAL(5,2) | HST rate % frozen at booking; editable until paid |
| `tax_amount` | DECIMAL(10,2) | Computed tax in dollars (`amount × tax_rate / 100`) |
| `due_date` | DATE | When a *scheduled* payment is due; NULL = due at registration (`Payment::isScheduled()`) |
| `period_key` | VARCHAR(20) | Scheduled-billing dedup key: session date (weekly) or `YYYY-MM` (monthly); NULL otherwise |
| `notice_batch` | VARCHAR(32) | Shared reference for the payments one due-notice email covers, so a lump-sum e-transfer reconciles to them; NULL otherwise |
| `etransfer_email` | VARCHAR(191) | Frozen e-transfer destination; editable until confirmed |
| `stripe_payment_intent_id` | VARCHAR(255) | Stripe PaymentIntent id; NULL for e-transfer / comp |
| `receipt_number` | VARCHAR(50) | Sequential receipt id; set when `paid` |
| `receipt_sent_at` | DATETIME | When the receipt email was sent; NULL until sent |
| `created_at` | DATETIME | Insertion time |
| `paid_at` | DATETIME | When marked `paid`; NULL otherwise |
## Payment Flow
1. During registration the front-end calls `POST /payments/intent` — but only when the registration response carried a `payment` summary (unpriced registrations return `payment: null` and skip the payment step). The intent call creates a Stripe PaymentIntent for a `card` student and returns the client secret. (`etransfer` returns a `pending` payment; `comp` returns none.)
2. The browser confirms the card payment with Stripe.
3. Stripe calls `POST /payments/webhook`; on `payment_intent.succeeded` the payment is marked `paid`, `paid_at` is stamped, and the linked lesson/enrolment is `confirmed`.
4. On transition to `paid`, `ReceiptMailer` assigns a `receipt_number`, emails the student a receipt, and stamps `receipt_sent_at`.
5. For an e-transfer, the studio admin later calls `PATCH /payments/{id}` to mark it `paid`, which triggers the same confirmation + receipt.
## Scheduled Billing (weekly / monthly)
`weekly` and `monthly` offerings are **not** charged at registration. The booking /
enrolment succeeds with `payment: null`; the lesson is confirmed (or the enrolment stays
active) immediately, and payments are generated later by the daily
`us_generate_due_payments` cron scan (`Payment\ScheduledBillingRunner`). Each generated
payment carries a `due_date` and `period_key`, flows through the same
`PaymentService::createForRegistration` (so HST, method resolution, e-transfer freezing
and comp auto-pay are identical), and the student is emailed one consolidated itemised
notice per scan (`Payment\PaymentDueMailer`). Because these payments are scheduled,
`PaymentService::voidPending` never voids them — cancelling one lesson leaves a shared
monthly charge (and every other lesson it covers) untouched, and never rebills. Full
model, dedup, and the four generation cases are documented in `scheduled-billing.md`.
Cancelling a lesson that was **already paid** issues the student an account credit for
that lesson's share of what they paid; the next daily scan applies any available credit
against their due charges (reducing `us_payments.credit_applied``Payment::netDue()`)
before emailing the notice. See `credits.md`.
## REST API
| Method | Endpoint | Permission |
|---------|---------------------------------------------|-----------------------------|
| `POST` | `/wp-json/us-scheduler/v1/payments/intent` | `book_lesson` |
| `POST` | `/wp-json/us-scheduler/v1/payments/webhook` | Public (Stripe signature verified) |
| `PATCH` | `/wp-json/us-scheduler/v1/payments/{id}` | `manage_billing` |
See `payment-reporting.md` for the monthly report and CSV export endpoints.
## Implementation
- Repository: `Unsupervised\Schedular\Payment\PaymentRepository`
- Model: `Unsupervised\Schedular\Payment\Payment`
- Stripe gateway: `Unsupervised\Schedular\Payment\StripeGateway`
- Receipts: `Unsupervised\Schedular\Payment\ReceiptMailer`
- Settings page: `Unsupervised\Schedular\Payment\StudioSettings`
- REST endpoint: `Unsupervised\Schedular\Payment\PaymentEndpoint`
## Tests
- `tests/Unit/Payment/PaymentRepositoryTest.php`
- `tests/Unit/Payment/PaymentTest.php`
- `tests/Unit/Payment/StripeGatewayTest.php`
- `tests/Unit/Payment/ReceiptMailerTest.php`