b-auth)
      * [ Facebook Login  ](/docs/auth/cpp/facebook-login)
      * [ Sign in with Apple  ](/docs/auth/cpp/apple)
      * [ Twitter Login  ](/docs/auth/cpp/twitter-login)
      * [ Microsoft  ](/docs/auth/cpp/microsoft-oauth)
      * [ Yahoo  ](/docs/auth/cpp/yahoo-oauth)
      * [ Phone Number  ](/docs/auth/cpp/phone-auth)
      * [ Use a Custom Auth System  ](/docs/auth/cpp/custom-auth)
      * [ Anonymous Authentication  ](/docs/auth/cpp/anonymous-auth)
      * [ Link Multiple Auth Providers  ](/docs/auth/cpp/account-linking)

    * Unity 

      * [ Get Started  ](/docs/auth/unity/start)
      * [ Manage Users  ](/docs/auth/unity/manage-users)
      * [ Password Authentication  ](/docs/auth/unity/password-auth)
      * [ Google  ](/docs/auth/unity/google-signin)
      * [ Play Games Sign-in  ](/docs/auth/unity/play-games)
      * [ GitHub Authentication  ](/docs/auth/unity/github-auth)
      * [ Facebook Login  ](/docs/auth/unity/facebook-login)
      * [ Sign in with Apple  ](/docs/auth/unity/apple)
      * [ Twitter Login  ](/docs/auth/unity/twitter-login)
      * [ Microsoft  ](/docs/auth/unity/microsoft-oauth)
      * [ Yahoo  ](/docs/auth/unity/yahoo-oauth)
      * [ Phone Number  ](/docs/auth/unity/phone-auth)
      * [ Use a Custom Auth System  ](/docs/auth/unity/custom-auth)
      * [ Anonymous Authentication  ](/docs/auth/unity/anonymous-auth)
      * [ Link Multiple Auth Providers  ](/docs/auth/unity/account-linking)

    * Admin 

      * [ Introduction  ](/docs/auth/admin)
      * [ Manage Users  ](/docs/auth/admin/manage-users)
      * [ Import Users  ](/docs/auth/admin/import-users)
      * [ Create Custom Tokens  ](/docs/auth/admin/create-custom-tokens)
      * [ Verify ID Tokens  ](/docs/auth/admin/verify-id-tokens)
      * [ Manage Multi-factor Users  ](/docs/auth/admin/manage-mfa-users)
      * [ Manage User Sessions  ](/docs/auth/admin/manage-sessions)
      * [ Manage Session Cookies  ](/docs/auth/admin/manage-cookies)
      * [ Control Access with Custom Claims  ](/docs/auth/admin/custom-claims)
      * [ Generating Email Action Links  ](/docs/auth/admin/email-action-links)
      * [ Errors  ](/docs/auth/admin/errors)

    * [ Customize the Email Action Handler  ](/docs/auth/custom-email-handler)
    * [ Extend with Cloud Functions  ](/docs/auth/extend-with-functions)
    * [ Extend with blocking functions  ](/docs/auth/extend-with-blocking-functions)
    * [ Email Custom Domains  ](/docs/auth/email-custom-domain)
    * [ Case Studies  ](/docs/auth/case-studies)
    * [ Usage Limits  ](/docs/auth/limits)

  * Cloud Firestore 

    * [ Introduction  ](/docs/firestore)
    * [ Get started  ](/docs/firestore/quickstart)
    * Understand Cloud Firestore 

      * [ Compare Cloud Firestore and Realtime Database  ](/docs/firestore/rtdb-vs-firestore)
      * [ Data model  ](/docs/firestore/data-model)
      * [ Data types  ](/docs/firestore/manage-data/data-types)
      * [ SDKs and client libraries  ](/docs/firestore/client/libraries)
      * [ Index types  ](/docs/firestore/query-data/index-overview)
      * [ Database locations  ](/docs/firestore/locations)
      * [ Data bundles  ](/docs/firestore/bundles)

    * [ Manage databases  ](/docs/firestore/manage-databases)
    * Add and manage data 

      * [ Structure data  ](/docs/firestore/manage-data/structure-data)
      * [ Add data  ](/docs/firestore/manage-data/add-data)
      * [ Transactions and batched writes  ](/docs/firestore/manage-data/transactions)
      * [ Data contention in transaction  ](/docs/firestore/transaction-data-contention)
      * [ Delete data  ](/docs/firestore/manage-data/delete-data)
      * [ Manage Cloud Firestore with the Firebase console  ](/docs/firestore/using-console)
      * [ Export and import data  ](/docs/firestore/manage-data/export-import)
      * [ Manage data retention with time-to-live policies  ](/docs/firestore/ttl)
      * [ Process data in bulk with Dataflow  ](/docs/firestore/dataflow-connector)