Game client like Steam, but with OpenID/OAuth 2

Hi

For our VR concept, we’re looking at adding a client app, almost just like Steam, where you can access your games/apps, get a notification when the program has an update, and functions so that you can install an app/game in the right place with one button. The thing is, we have a big IT system for our clients where they have their own user login. We want to use the same login that they alredy have, and the guys who develop this solution for us says that OAuth 2 / OpenID will work. So anybody knows if such client program exist, where we can customize the login protocol?