Utilizing Service API for RESTful Services

Hello,

I'm trying to use Postman to run a GET request to retrieve a token in order to be able to retrieve content data for put together REST methods within my Epi environment.

I'm following the documentation at [https://world.episerver.com/documentation/developer-guides/Episerver-Service-API/installation-and-configuration/] and using the information from the Authorization Token example to run a GET request within Postman but it doesn't seem to be working.

Am I missing something? Is there documentation or tutorials anywhere that explains how to do this clearer?

Thanks.