API key is missing error(2112), even when having API Key and Secret in the request

[unnicris]

I am trying to fiddle with the WazirX APIs to learn about it.
But in postman even after setting up the API Key and secret, I am getting "API key is missing" error with error code 2112. I don't know if I am missing something or if this is an issue.

Here is the request I am sending from postman:
{{wazirx_api_domain}}/sapi/v1/funds?recvWindow1=20000&timestamp={{current_time}}&signature={{signature}}
Response:

{
    "code": 2112,
    "message": "API key is missing"
}

Note: I am able to get successful response for some other requests such as {{wazirx_api_domain}}/sapi/v1/exchangeInfo