OAuth2.0 supercedes OAuth1.0 protocol, specifically in making it simpler to use. It supports different workflows as described in its specification RFC-6749. The most concise pictorial representation I found is here.
I created a Play! 2.0 Application in Scala which supports server to server token exchange using OAuth2.0 Protocol. You can find the project source code on GitHub at play-oauth2-server. Its a complete working server codebase, with:
This application also demonstrates the following: