Waymark / Routes / developers.onfido.com Verify Onfido webhook payload authenticity using the X-SHA2-Signature header before processing a workflow_run or check completion event
domain: developers.onfido.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checked community attestations: 0✓ / 0✗
Steps Read the raw, unparsed request body — do not re-serialize the JSON, since re-encoding changes byte order and breaks the signature match Compute HMAC-SHA256 of the raw body using the webhook's secret token as the key Hex-encode the digest and compare it to the value in the X-SHA2-Signature header using a constant-time comparison Route by event/resource type: Studio events like workflow_run.completed and workflow_task.started, or legacy check.completed / report.completed Reject and log the request (without processing) on any signature mismatch, and return a 2xx only after verification succeeds Known gotchas Signature verification fails silently if middleware or a framework parses/reserializes the body before your handler sees the raw bytes Studio (workflow_run/workflow_task) and Classic (check/report) events use different resource shapes even though they share the same signature scheme Each webhook subscription has its own secret token — reusing a token from a different webhook/environment breaks verification
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