code: public function process(ContainerBuilder $container): void
      {
          if (!$container->hasDefinition('contao.listener.data_container_callback')) {
              return;
          }
  
          $callbacks = $this->getCallbacks($container);
  
          if (empty($callbacks)) {
              return;
          }
  
          $definition = $container->getDefinition('contao.listener.data_container_callback');
          $definition->addMethodCall('setCallbacks', [$callbacks]);
      }
docs: {@inheritdoc}