Flowcharts & Processes

Verifying Stripe Webhooks Securely

Flowcharts & Algorithms diagram · made in Skemio

Flowchart showing Stripe webhook lifecycle: receive raw bytes, compute HMAC signature, reject if invalid, check timestamp tolerance, check event ID idempotency, process payment, and return HTTP 200.
Flowchart showing Stripe webhook lifecycle: receive raw bytes, compute HMAC signature, reject if invalid, check timestamp tolerance, check event ID idempotency, process payment, and return HTTP 200.
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What it shows

  • Read raw payload bytes; parsed JSON changes serialization and breaks HMAC.
  • Reject timestamps older than 5 minutes to prevent replay attacks.
  • Store the event ID in a persistent cache to ensure idempotency.

The takeaway

Verify raw bytes first, enforce a timestamp tolerance window, and deduplicate by event ID.

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