'Flutter firebase phonenumberauth how to get code

I use Firebase login to let the user use Facebook, but I also need to save the phone number using otp. So I do it as follows:

sendOtp() async {
  print('otp call');
  await FirebaseAuth.instance.verifyPhoneNumber(
  phoneNumber: '+923323789263',
  verificationCompleted: (PhoneAuthCredential credential) {},
  verificationFailed: (FirebaseAuthException e) {},
  codeSent: (String verificationId, int code) {
 
  },
  codeAutoRetrievalTimeout: (String verificationId) {},
);
}

OTP Code is going to the number but I need that code so I can match it with user input.

I have entered user otp to verify also like this

            AuthCredential credential = PhoneAuthProvider.credential(
                verificationId: verificationIdd,
                smsCode: textEditingController.text.trim());
            print(credential);
            FirebaseAuth.instance.signInWithCredential(credential);

            final User user = FirebaseAuth.instance.currentUser;

But i don't want to signin I need to just check that the use enter correct otp or not. I try to print credential but its showing same response for correct and wrong otp which is this

AuthCredential(providerId: phone, signInMethod: phone, token: null)

And it's not showing anything from which i can guess otp is correct or not.

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'Flutter firebase phonenumberauth how to get code

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