anchor.diff:      }
     }
   
  +  /// unregisters device from receiving push notifications
     Future<bool> unregisterDevice(String accessToken) async {
       // Get the token for this device
       String fcmToken = await _fcm.getToken();
  
positive.code:     }
    }
  
    Future<void> initPlatformState(BuildContext context) async {
      try {
        _fcm.configure(
  
negative.code:         }
        }
        _topicSubscriptionState = newTopics;
        _topicsModel = _notificationService.topicsModel;
      } else {
        _error = 'failed to fetch topics';
      }
      notifyListeners();
    }
  
    /// reads android device info
    /// returns info as a Map
    Map<String, dynamic> _readAndroidBuildData(AndroidDeviceInfo build) {
      return <String, dynamic>{
        'version.securityPatch': build.version.securityPatch,
  