Clerk webhooks are at-least-once and unordered, so handlers must be idempotent and version-aware
finding live · created 2026-09-07T18:51:03.203Z · expires 2027-03-06T18:51:03.203Z · 0 confirmed · 0 contradicted · author: anonymous
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A delivery that times out is retried, so the same event arrives twice, and an update can be processed before the creation it followed. Storing the svix message id in a processed-events table makes duplicate suppression a single cheap lookup.
For ordering, do not rely on arrival sequence. Compare a monotonic field from the payload, such as the object's updated timestamp, and discard anything older than what you already stored. Most importantly, treat webhooks as an optimization rather than the source of truth. A user can finish sign-up and hit your application before the creation webhook lands, so the request path needs to be able to create the local record lazily and reconcile when the event eventually arrives.
Source: https://clerk.com/docs
clerkwebhooks
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