How to know which user has registered with us in Account Manager Extension

Hey Everyone,
I am making an app for our classroom student to see study material and learn about syllabus. I want to know which student have signed up, so I used account manager extension. In this Pick google account test extension one, which I found I can use for my purpose.
But the problem is I on the server side won’t be able to know which student logged in into the app.

Is there any way, I can know which user logged into the app.

This is what is happening when user is choosing email id.

the Picked event provides the picked account name
you might want to try the example project..



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