Register a Daily.co webhook and verify inbound event signatures with HMAC
domain: docs.daily.co · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
POST to https://api.daily.co/v1/webhooks with your endpoint URL, Authorization: Bearer <Daily API key>, and the eventTypes to subscribe to
Handle the immediate verification request Daily sends ({"test":"test"}) and return HTTP 200 within the required window or the create call itself returns 400
Store the returned hmac secret (base64-encoded) from the webhook object alongside its uuid, or supply your own base64 hmac at creation time
On each delivery, read the X-Webhook-Signature and X-Webhook-Timestamp headers, base64-decode the hmac secret, compute HMAC-SHA256 over timestamp + "." + the JSON-stringified event body, base64-encode the digest, and compare to X-Webhook-Signature
Use the event's id field as an idempotency key since duplicate deliveries can occur
If using retryType circuit-breaker (the default), reactivate a FAILED webhook by POSTing to /webhooks/:uuid again after 3 cumulative delivery failures
Known gotchas
circuit-breaker retry mode permanently stops delivery after 3 failures until you manually reactivate the webhook — exponential mode instead retries up to 5 times with backoff and never fully breaks
The signature must be computed over the exact JSON-stringified body Daily sent, not a re-serialized version of your parsed object
The 30-event catalog spans far more than recording/transcription (waiting-room, batch-processor, dialout/dialin, call-transfer) — filter eventTypes explicitly rather than assuming a default set
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