Authorization to an API with no documentation

I need to connect to an API that has virtually no documentation. The company is totally unresponsive when asked for help. I’ve tried many different combinations and nothing is working.

This is what I have been given:
Request Type: GET
Request Template: User Compiance
Authorization Client Key: XXXXXXXXXXXXXXXXXXXXXXX
Authorization Client Secret: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Output Format: JSON
Website Address: http:\api.workhub.com\user\compliance.json?id=XXXXXXXXXXX&WorkerIDNumber={{WorkerIDnumber}}

What type of Authorization is this? i.e. in the Postman “Type” drop down. Given the presence of a Client Secret I would think I need to get a token, but there is no token URL.

Thanks for any help

I would try Basic Auth first.

Thanks for helping!

I tried Basic, both with the username/password I login to the Website and also with Client Key/Client Secret.

Both get this reply: “Status Code: 401; Unauthorized”

I’ve also tried “API Key”