All other Firebase Auth features are no-cost on all plans . Prices are per successful verification. On the Blaze plan, Phone Authentication provides a no-cost tier. The first 10K verifications for both instances (USA, Canada, and India and All other countries) are provided at no cost each month.
Read moreWhy is FirebaseUser not found?
To Solve Undefined class ‘FirebaseUser’ just use User instead of FirebaseUser because after the new update of package firebase_auth, the class FirebaseUser was changed to User , and the class AuthResult was changed to UserCredentail. Therefore change FirebaseUser to User.
Read more