code: protected function getShopIds()
      {
          $shopIds = [];
  
          try {
              $shops = $this->container->getParameter('ongr_connections.shops');
          } catch (InvalidArgumentException $e) {
              $shops = [];
          }
  
          foreach ($shops as $shop) {
              $shopIds[] = $shop['shop_id'];
          }
  
          return $shopIds;
      }
docs: Gets ids of shops from the configuration.
  
  @return array