Fix HMAC signature mismatch
HMAC verification fails when the computed hash doesn't match the provided signature. Often due to encoding or message format.
Common causes
- Wrong encoding (hex vs base64).
- Different message format (body vs payload).
- Secret mismatch.
How to fix
- Use the same encoding as the provider (hex/base64).
- Hash the exact payload the provider uses.
- Use HMAC Checker to verify.
Use our tool
Check HMACRelated