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
parent 3f9aef7746
commit e8e66eef3c
30 changed files with 1210 additions and 80 deletions
@@ -118,6 +118,11 @@ notice per scan (`Payment\PaymentDueMailer`). Because these payments are schedul
 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                  |
 |---------|---------------------------------------------|-----------------------------|