Challenges Fabulous wanted to implement an onboarding flow that was very easy to use, required minimal updates, and reduced friction with the end user. Fab- ulous had a few key requirements for using a 3rd party authentication sys- tem: First, Fabulous wanted to ensure that users could experiment with the app anonymously and then sign-up the next day. Second, Fabulous wanted the flexibility to sign-in users using multiple providers, like Facebook Login or Google Sign-in and then have the authentication system recognize the user even if they tried signing in via a different method. Third, Fabulous wanted to preserve the look-and-feel of its app on onboarding pages. Solution Fabulous implemented Firebase Authentication in one afternoon, and it met all of its requirements. Using

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