To generate an HTTP Signature in CyberSource REST API, developers must create a SHA 256 digest of the request body and include required headers like host, date, digest, and v c merchant id. The signature string is then signed using the merchant’s secret key with HMAC SHA256 encoding. Ensure the header order matches CyberSource documentation exactly, or authentication will fail. Common mistakes include incorrect timestamps, invalid digest values, and missing headers. Always test signatures in the CyberSource sandbox environment before moving to production to verify request authentication and API connectivity properly.
