First of all, it's important to note that the documentation might be outdated:
After IBM’s acquisition of StrongLoop, we have integrated
strong-gateway with the latest product offering from IBM called API
Connect.
In any case, if you need some directions on how the server is set to provide OAUTH 2 authentications you should look at the following git project and pay a close attention to the following:
- strong-gateway/server/server.js - gives you an idea of which modules and methods to create inside your server script.
- strong-gateway/test/ * - has a bunch of scripts that shows how it is used in an authorization context.
Git project using OAuth2.0 with the StrongLoop API Gateway: https://github.com/strongloop-archive/strong-gateway