{ "code": 40103, "message": "Invalid signature in request credentials", "stat": "FAIL" }

I can do GET command successful via postman, in below resultset . but when try POST with everything same and adding parameters to body as username with x-www-form-urlencoded type. It shows below error.
“code”: 40103,
“message”: “Invalid signature in request credentials”,
“stat”: “FAIL”

what can cause it in Postman for POST request

Hi, I think the answers you need are in the past discussion thread here, specifically see the reply on building the signature using the pre-request script feature in postman.

Also, are you url encoding the params in the request? There is a third-party Postman public workspace that some people are using that doesn’t encode the key-value pairs.

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