test: add integration tests for Stripe webhook handlers

Add comprehensive test coverage for all Stripe webhook event handlers:
- invoice.paid (subscription renewal, non-subscription, missing sub)
- invoice.payment_failed (past due, notifications, edge cases)
- customer.subscription.created/updated/deleted (full lifecycle)
- payment_method.attached/detached/updated (card management)
- setup_intent.succeeded (hosted setup page)
- charge.succeeded & payment_intent.succeeded (Stripe Radar fraud scoring)
- Idempotency / duplicate event rejection
- Webhook audit trail logging
- Stripe status mapping for all subscription states

Fixes #11

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Claude 2026-03-24 16:35:48 +00:00
parent 5bce748a0f
commit 96f83eca1b
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