Response: text/html; charset=utf-8 All fields are returned as x-www-form-urlencoded key=value pairs, each terminated by a newline character (0x0A).
Authentication
The checksum is used to ensure that it is Merchant (and not a fraudster) that sends the request to FYST. This SHA-1 checksum, the parameter control, is created by concatenation of these parameters values in the following order:
To reproduce your API call, input all of the data from your original request, including the authentication tokens. Don’t forget to set the nonce and timestamp to the values you used. An OAuth signed URL should match regardless of the generating library. If the signatures differ, you know there is a bug in your OAuth signature code.