Get AuthCredential instead of login with Firebase UI Phone Auth

[ArcherEmiya05]

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Step 1: Are you in the right place?

Yes

Step 2: Describe your environment

• Android device: Any
• Android OS version: Any
• Google Play Services version: Any
• Firebase/Play Services SDK version: Any
• FirebaseUI version: Any

Step 3: Describe the problem:

Steps to reproduce:

1. Integrate Firebase Auth UI
2. Use Phone Auth as the only provider
3. Sign in Phone Auth

Observed Results:

Instead of signing in which returns a null AuthCredential is there a way for us to get Phone Auth Credential only and not performing sign in?

Expected Results:

Add a flag whether Phone Auth will sign in or just get the AuthCredential that can be use for linking.