ASP.NET MVC4 and Web API Authentication + Authorization (Windows 8 and Web)

Question

I created an ASP.NET MVC 4 Internet Web Application using Simple Membership db for storing users, roles and profiles.

In my app I created a Web API controller that will

Answer 1

You should make another api, that checks the authentication from the Windows 8 app or Windows.

If its pass successfully from the authentication, then only you have to show user list to the client.