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API Request Signing Basics

Prove who sent the request

Signing API requests involves creating HMAC or asymmetric signatures over canonicalized requests with timestamps and nonces, validating on the server to ensure integrity and authenticity while preventing replay.

Canonicalize

Normalize method, path, headers, body before signing.

Sign Securely

Use HMAC/asymmetric keys; include timestamp and nonce.

Verify

Check signature, freshness window, and replay cache on the server.

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