API Authentication uses different URL than Get request

[Anonymous]

I'm trying to connect my report to a Web API off of an application.

The main problem is that the URL to get data is something like this:

https://apiurl/qcbin/rest/domains/<domainname>/projects/<projectname>

But if I want to authenticate (using username and password because the API is too old for tokens), the URL is this instead:

https://apiurl/qcbin/authentication-point/api-authenticate/

 How would I go about coding that query? I've tried just about every kind of authentication I could think of with no success.

I might be able to use relativepath somehow but the problem is I still need to turn this into a dynamic query which will be used an invoked custom query in another table. 

[artemus]

What kind of response is given when you authenticate? You could parse the results out and pass it to the other query.