Can I secure my Asp.net MVC using external JWT provider

Question

I have an Asp.Net MVC 5 web application like: http://www.mmm.com and I need to use an External JWT (JSON Web Token) provider like http://www.example.com/token. This service will return (Token) if username and password are correct how to deal with it and secure my controllers and how to check in every request that (Token) is correct. I know that Asp.Net Identity providing built-in integration for the authentication services such as Facebook, Google, Microsoft Accounts and Twitter but not the custom external provider link.