stripe webhook delivered multiple times duplicate order

The actual problem

Idempotency gaps cause double fulfillments or double unlocks after webhook retries.

Do this

1. Key fulfillment on event.id (or payment_intent id) in a durable store.
2. Return 200 only after idempotent write succeeds.
3. Replay a test event twice in Stripe CLI; confirm one side effect.
4. Keep a demo unlock path for local without forwarding.

Tools for this job

• Stripe CLI

  Forward and replay webhooks locally

Related intents

• stripe webhook local nextjs without forwarding
• stripe connect application fee not showing