In this chapter, we updated the Azure backend service we created in the previous chapter with Facebook provided identity. We also updated the API data service in the TripLog app to authenticate its HTTP API requests with a user-specific auth token provided by Azure Mobile Apps service given a valid Facebook access token. Finally, we added a sign in page and updated the app to automatically route the user to the sign in page if an auth token isn't found in local settings. In the next, chapter we are going to create unit tests and automated UI tests for our TripLog app.