API request help

I’m looking for some advice on how to use the REST API with an external javascript application on a separate server. I am having trouble with the authentication.

I’ve been trying to use postman to test the api calls from https://courses.edx.org/api-docs/, But I cannot seem to get it working.

Specially, the information I am trying to get is the current logged in username or id.

Any advice on how to get it authenticated with postman would be greatly appreciated. I see on lms/admin panel I am able to create authentications but I am a little confused by it all. I feel like once I get it working with postman, I will be able to integrate it with an external application.