feat(billing): add Stripe-style inbound webhook pipeline for subscrip… - #73
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…tions Replaces manual subscription toggling with a real webhook pipeline: HMAC-verified POST /api/v1/webhooks/billing, an idempotent BillingWebhookEvent store (unique eventId short-circuits replays and concurrent duplicate deliveries via the DB unique constraint), transactional subscription.activated/cancelled/payment.failed handling with a BillingCustomerMap side table to resolve external IDs, structured audit logging per transition, and a read-only admin listing endpoint. Unknown event types and downstream mutation failures are recorded and still return 200 rather than 500. Dev mode allows an unset webhook secret with a loud warning; production refuses to boot without one. Also fixes a pre-existing build break: gdpr.service.ts referenced AuditAction.GDPR_DATA_EXPORTED/USER_SELF_DELETED, which were never added to the enum.
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closes #59
this Pr Implemented a robust billing webhook pipeline to automate subscription lifecycle updates.
What Changed
Added POST /api/v1/webhooks/billing with raw body support and HMAC signature verification.
Implemented idempotent webhook event processing using a persistent BillingWebhookEvent store.
Added transactional handling for:
subscription.activated
subscription.cancelled
payment.failed
Gracefully ignored and recorded unsupported webhook events.
Added external billing ID mapping, structured audit logs, failure metadata, and processing latency tracking.
Enforced webhook security with payload size limits, environment-based secret validation, and isolated rate limiting.
Added comprehensive tests covering valid events, idempotency, invalid signatures, rollback behavior, concurrent deliveries, and missing ID mappings