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- Add POST /api/webhooks/stripe endpoint for Stripe event processing - Handle payment_intent.succeeded: mark invoice as paid, set paymentMethod=card - Handle payment_intent.payment_failed: record failure reason on invoice - Handle charge.refunded: mark invoice as void - Handle charge.dispute.created: log dispute - Idempotency: skip if stripePaymentIntentId already recorded - Add stripe_payment_intent_id, stripe_refund_id, payment_failure_reason columns - Requires STRIPE_WEBHOOK_SECRET env var for signature verification Co-Authored-By: Paperclip <noreply@paperclip.ing>