feat(auth): add support for fullName when using Sign in with Apple

[andrewdollard]

Description

Adds the ability to set the user's full name when using Sign In With Apple.

When signing in with Apple using e.g. react-native-apple-authentication, Apple provides a fullName value which must be displayed in the app; furthermore, Apple provides this data only on initial sign-up and not on subsequent sign-ins.

firebase-ios-sdk supports setting that value when signing in via Firebase with an Apple credential; however, react-native-firebase does not currently provide a way to pass the fullName value to the underlying Firebase native code. As a result, using Sign In With Apple requires storing the user's name data in the app instead of in Firebase as with other social auth providers.

This PR adds a signInWithAppleCredential method to the auth module, which passes the fullName value to appleCredentialWithIDToken in the Firebase iOS SDK so it can be forwarded to Firebase on sign-up.

Notes:

• AppleAuthProvider.credential is extended to take an optional fullName parameter
• signInWithAppleCredential accepts a credential with or without the fullName property
• The behavior of the existing signInWithCredential method is unchanged

This feature is iOS only; AFAICT this functionality is already handled by the Firebase Android SDK (docs).

Related issues

Fixes #7603

Release Summary

Adds ability to set fullName when using Sign In With Apple

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

I wasn't able to add e2e tests as the Firebase emulator doesn't support social auth, but I am running it in my own app:

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 1, 2025 3:56pm

[CLAassistant]

All committers have signed the CLA.

[mikehardy]

interesting! This looks great - I want to think on it for just a little bit, what I'm curious about is if there is any way to allow the new AppleCredential (with full name extras) can simply go in to the existing API, and the code can dynamically check if the fullname exists and do the correct thing in the native module

More important than that is to consult the firebase-js-sdk to see if they have any applicable APIs, I haven't checked yet but in general if they have anything that handles this, we'll follow them exactly so we maintain status as a drop-in replacement