Treat webhooks as repeatable

A provider will send the same event twice. Your handler has to notice.

Store the event id

The first time you see an event id, do the work and record it. The second time, return success and do nothing.

Check the signature before you parse the body into a business action.

Acknowledge quickly and finish the slow part in a job. Providers retry when you are slow, which creates the duplicate you just tried to avoid.

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Engineering · July 17, 2026 · Gynvix · 1 min read

A provider will send the same event twice. Your handler has to notice.

The first time you see an event id, do the work and record it. The second time, return success and do nothing.

Check the signature before you parse the body into a business action.

Acknowledge quickly and finish the slow part in a job. Providers retry when you are slow, which creates the duplicate you just tried to avoid.