Custom Authentication:

1. For OLD Mobile Service - https://azure.microsoft.com/en-us/documentation/articles/mobile-services-dotnet-backend-get-started-custom-authentication/

2. For NEW Mobile App -

keys:

  1. Turn on App Service Authentication
  2. Add Microsoft.Azure.Mobile.Server.Login NuGet package
  3. Create custom authentication endpoint
  4. Configure service to require authentication
  5. Use token on client

http://www.newventuresoftware.com/blog/custom-authentication-with-azure-mobile-apps/

https://azure.microsoft.com/en-us/documentation/articles/app-service-mobile-dotnet-backend-how-to-use-server-sdk