code: private void parseAuthentication(Intent data) {
          String idToken = data.getStringExtra(Constants.ID_TOKEN_EXTRA);
          String accessToken = data.getStringExtra(Constants.ACCESS_TOKEN_EXTRA);
          String tokenType = data.getStringExtra(Constants.TOKEN_TYPE_EXTRA);
          String refreshToken = data.getStringExtra(Constants.REFRESH_TOKEN_EXTRA);
          long expiresIn = data.getLongExtra(Constants.EXPIRES_IN_EXTRA, 0);
          Credentials credentials = new Credentials(idToken, accessToken, tokenType, refreshToken, expiresIn);
  
          Log.d(TAG, "User authenticated!");
          onAuthentication(credentials);
      }
docs: Extracts the Authentication data from the intent data.
  
  @param data the intent received at the end of the login process.