通过调用外部ASP.NET Web Api服务在ASP.NET MVC Web应用程序中验证用户

I'm planning on making a restful web service using ASP.NET Web Api. A number of ASP.NET MVC web applications and possibly native apps will consume the service. The service will use ASP.NET Identity to authorise requests/users. I can see how I would use the service with native apps by passing a token with each request.I'm planning on making a restful web service us