code: public function indexAction(Request $request)
      {
          $parentRequest = $this->getParentRequest();
          $idProductAbstract = $request->attributes->get('idProductAbstract');
  
          $subscriptionForm = $this->getFactory()
              ->createSubscriptionForm($idProductAbstract)
              ->handleRequest($parentRequest);
  
          $this->processSubscriptionForm($subscriptionForm, $request);
  
          return [
              'subscriptionForm' => $subscriptionForm->createView(),
          ];
      }
docs: @param \Symfony\Component\HttpFoundation\Request $request
  
  @return array