This repository is a quick example of how to obtain an OAuth token and how to make use of the protected endpoints from the Discogs API.
Clone this repository and install the dependencies:
$ composer install
Add your consumer key and secret in $consumerKey and $consumerSecret.
For the sake of simplicity we're using the PHP internal webserver (quick and easy):
$ cd web
$ php -S localhost:8000
Now open your favorite browser and visit http://localhost:8000
As soon as you open the site, you'll be redirect to Discogs. After authorizing you'll be redirected to the site and now you have a OAuth token and secret with which you'll be able to access the protected endpoints.
This example is just some quick hacking together but I think it's enough to get you started.