How to get the <OwnerEmail> using the API endpoints?

How to get the <OwnerEmail> using the API endpoints?

I'm trying to write some API integrations, but the endpoint I need to use requires the passing of the owner email, and I was wondering if it was possible to read this value by using a different endpoint, because the way our interface is designed, we only show a button to start the oauth2 authentication flow, and it would mess things up a little bit if we had to alter the interface showing new UI elements to ask the person for their email.

If they authenticate with oauth2, could we simply use the accessToken and get the logged user information? 

thanks a lot

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