Sylius\Bundle\ResourceBundle\Controller\RequestConfiguration::getFlashMessage PHP Method

    public function getFlashMessage($message)
    {
        return $this->parameters->get('flash', sprintf('%s.%s.%s', $this->metadata->getApplicationName(), $this->metadata->getName(), $message));
    }

 /**
  * {@inheritdoc}
  */
 public function addSuccessFlash(RequestConfiguration $requestConfiguration, $actionName, ResourceInterface $resource = null)
 {
     $metadata = $requestConfiguration->getMetadata();
     $flashMessage = $requestConfiguration->getFlashMessage($actionName);
     $translatedMessage = $this->translateMessage($flashMessage, $metadata);
     if ($flashMessage === $translatedMessage) {
         $translatedMessage = $this->translateMessage(sprintf('sylius.resource.%s', $actionName), $metadata);
     }
     $this->session->getBag('flashes')->add('success', $translatedMessage);
 }