I'm evaluating WSO2 Identity Server and WSO2 API Manager. 

I registered an API and an application on API Manager. I can call the resources successfully.

I could also add an user into Identity Server and log into that using oAuth authentication. 

But, it's not too clear how I can use those two systems together. I would like to use API Manager to expose my API's to some applications. And, I would like to use Identity Server to log the final user. Is that possible? How can I "plug" those two systems?

I am not sure if that's the best way to do that, so, please, advice me. 

Thanks