Can I talk to the Drift API directly with HTTP requests?

We have several custom attributes for our visitors that I would like to draw from Drift's backend and save them in our own database.

Is this possible? How do we talk to the Drift backend to retrieve such information?

I created an App and have access to a clientID, Secret ID and Verification Token but there aren't any docs on how to use these to do a simple HTTP GET request to this endpoint for example:[email protected]