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Webhook Signatures cheat sheet

How APIs sign webhook payloads and how receivers verify them.

Quick lookup

HMAC SHA-256Check exact spelling, casing, and the platform documentation for this field.
timestamp toleranceCheck exact spelling, casing, and the platform documentation for this field.
raw body verificationCheck exact spelling, casing, and the platform documentation for this field.
replay preventionCheck exact spelling, casing, and the platform documentation for this field.

Common mistakes

  • Debugging the client before checking the raw request and response
  • Ignoring headers that explain cache, auth, or rate limits
  • Treating browser CORS failures as generic API downtime
  • Logging tokens or webhook secrets while troubleshooting

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