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Webhook Signing Is Not Optional: How to Verify a Callback Without Breaking Your Integration

Every integration eventually gets the same 2 a.m. page: "The webhooks stopped working after the deploy." Nine times out of ten, nothing about the sender changed.

  • Webhook signing crucial for verifying callbacks without breaking integration
  • Common mistakes include hashing parsed object, string equality comparison, ignoring timestamp
  • Follow steps: capture raw body, compute HMAC, constant-time comparison, enforce timestamp tolerance

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