A valid webhook signature does not make your handler idempotent. Replay one signed order webhook five times — you should still grant access exactly once.
A customer can complete checkout once while your webhook handler receives the
same event more than once. If every delivery creates access again, one purchase
can produce duplicate licenses, seats, credits, or subscription records.
The launch check is concrete:
Take one valid, signed order webhook. Deliver the exact same body five times.
Stripe webhook delivery is at-least-once, not exactly-once. Here is the atomic dedupe pattern our SaaS kit ships with by default.
A payment webhook once ack=timeout -> retry -> reorder -> duplicate ack can look healthy in...
The Silent Killer: Why Webhook Idempotency Matters You deploy a webhook handler that...
Stripe delivers webhooks at least once. Not exactly once — at least once. A network blip on your...
The first version of a webhook is always the same four lines: await fetch(customer.webhookUrl, { ...
A successful payment is not the same thing as a successful order. For a SaaS product that generates...
