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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]>