[android][auth] signInWithPhoneNumber now provides a verificationId for confirmResult usage...

android/src/main/java/io/invertase/firebase/auth/RNFirebaseAuth.java

@@ -183,7 +183,7 @@ class RNFirebaseAuth extends ReactContextBaseJavaModule {
   /**
    * The phone number and SMS code here must have been configured in the
    * Firebase Console (Authentication > Sign In Method > Phone).
-   *
+   * <p>
    * Calling this method a second time will overwrite the previously passed parameters.
    * Only one number can be configured at a given time.
    *
@@ -898,9 +898,12 @@ class RNFirebaseAuth extends ReactContextBaseJavaModule {
               if (withData) {
                 promiseWithAuthResult(task.getResult(), promise);
               } else {
-                promiseWithUser(task
-                                  .getResult()
-                                  .getUser(), promise);
+                promiseWithUser(
+                  task
+                    .getResult()
+                    .getUser(),
+                  promise
+                );
               }
             } else {
               Exception exception = task.getException();
@@ -960,7 +963,15 @@ class RNFirebaseAuth extends ReactContextBaseJavaModule {
                 // as calling ConfirmationResult.confirm(code) is invalid in this case anyway
                 if (!promiseResolved) {
                   WritableMap verificationMap = Arguments.createMap();
-                  verificationMap.putNull("verificationId");
+
+                  Parcel parcel = Parcel.obtain();
+                  phoneAuthCredential.writeToParcel(parcel, 0);
+                  parcel.setDataPosition(16); // verificationId
+                  String verificationId = parcel.readString();
+                  mVerificationId = verificationId;
+                  parcel.recycle();
+
+                  verificationMap.putString("verificationId", verificationId);
                   promise.resolve(verificationMap);
                 }
               } else {
@@ -1062,9 +1073,12 @@ class RNFirebaseAuth extends ReactContextBaseJavaModule {
               TAG,
               "_confirmVerificationCode:signInWithCredential:onComplete:success"
             );
-            promiseWithUser(task
-                              .getResult()
-                              .getUser(), promise);
+            promiseWithUser(
+              task
+                .getResult()
+                .getUser(),
+              promise
+            );
           } else {
             Exception exception = task.getException();
             Log.e(