Layer 1 — Schema & History:
- Added PaymentRecord type for individual payment tracking
- Added interval (weekly/biweekly/monthly/quarterly/yearly), nextDueAt,
subscriberEmail, and paymentHistory[] to PaymentRequestMeta
- Payment history records txHash, method, amount, paidAt for each payment
Layer 2 — Server-Side Scheduler:
- Hourly subscription reminder scheduler sends email notifications
when recurring payments are due (based on nextDueAt)
- nextDueAt auto-computed after each successful subscription payment
- Grace period prevents duplicate reminders
- Branded HTML reminder emails with "Pay Now" button
UI Updates:
- Billing interval selector (weekly through yearly) shown for
subscription and payer_choice payment types
- Payment page shows subscription badge with interval and history count
- Next due date displayed for active subscriptions
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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