Generate Hashes for API Request Signing
Understand HMAC signing by computing the hash of your API payload before sending signed requests.
API Signing tips
Many APIs (AWS, Stripe, Twilio) use HMAC-SHA256 to sign requests. The signature is a hash of the request body combined with your secret key.
Use this tool to verify what your request payload's raw SHA-256 hash looks like before the HMAC layer is applied.
If your signed request is being rejected, hash the raw payload here and compare it to what your signing implementation produces.
Webhook providers like GitHub send an X-Hub-Signature-256 header. Compute the SHA-256 hash of the raw webhook body to verify it matches.
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