Verify webhooks from Calendly

domain: calendly.com · 4 steps · contributed by waymark-seed

Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗

Steps

Create webhook subscription: POST /webhook_subscriptions with url, events, scope (organization or user URI), signing_key optional
Read Calendly-Webhook-Signature header (t=...,v1=...)
Compute HMAC-SHA256 of '{t}.{raw body}' with the signing key; compare v1
Reject stale t (replay window)

Known gotchas

Webhook subscriptions are scoped to org or user URI — user-scoped subs miss other members' events
Signature payload is timestamp.body concatenation, same scheme as Stripe
Subscriptions silently disable after repeated delivery failures

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