code: protected function registerFactory()
      {
          $this->app->singleton('notifyme.factory', function () {
              return new NotifyMeFactory();
          });
  
          $this->app->alias('notifyme.factory', NotifyMeFactory::class);
          $this->app->alias('notifyme.factory', FactoryInterface::class);
      }
docs: Register the factory class.
  
  @return void