https://apihub.ai-term-hub.com/tags/webhook-security/Recent content in Webhook-Security on APIHub - Global API DirectoryHugoenThu, 23 Jul 2026 00:00:00 +0000https://apihub.ai-term-hub.com/guides/webhook-security/Thu, 23 Jul 2026 00:00:00 +0000https://apihub.ai-term-hub.com/guides/webhook-security/<h1 id="webhook-security">Webhook Security</h1> <p>Webhooks let an API push events to your server as they happen. Because the caller is the API itself, you must verify that each payload really came from the provider and was not tampered with.</p> <h2 id="signature-verification">Signature Verification</h2> <p>Providers sign the raw request body (sometimes with a timestamp) using HMAC with a shared secret. Stripe uses <code>Stripe-Signature</code>, Twilio uses <code>X-Twilio-Signature</code>, and Adyen sends <code>HMACSignature</code>. To verify:</p> <ol> <li>Read the raw body before any parsing.</li> <li>Recompute HMAC-SHA256 of the body (plus timestamp if used) with your webhook secret.</li> <li>Compare with the signature header using a constant-time comparison.</li> <li>Reject mismatches with 401 and do not process the event.</li> </ol> <h2 id="replay-protection">Replay Protection</h2> <p>A stolen valid payload could be re-sent later. Signatures that include a timestamp (Stripe, Adyen) let you reject events older than e.g. 5 minutes. Track processed event IDs in a deduplication store to avoid handling the same event twice.</p>