code: public function handle(CommandInterface $command)
      {
          /**
           * @var Manufacturer $manufacturer
           */
          $manufacturer = $command->getPayload();
  
          $params = [
              'name' => $manufacturer->getName(),
          ];
  
          if (null !== $manufacturer->getLink()) {
              $params['link'] = $manufacturer->getLink();
          }
  
          if (null !== $manufacturer->getLogoIdentifier()) {
              $mediaIdentity = $this->identityService->findOneBy([
                  'objectIdentifier' => (string) $manufacturer->getLogoIdentifier(),
                  'objectType' => Media::TYPE,
                  'adapterName' => ShopwareAdapter::NAME,
              ]);
  
              if (null !== $mediaIdentity) {
                  $params['image'] = [
                      'mediaId' => $mediaIdentity->getAdapterIdentifier(),
                  ];
              }
          }
  
          $identity = $this->identityService->findOneBy([
              'objectIdentifier' => (string) $manufacturer->getIdentifier(),
              'objectType' => Manufacturer::TYPE,
              'adapterName' => ShopwareAdapter::NAME,
          ]);
  
          if (null === $identity) {
              $existingManufacturer = $this->findExistingManufacturer($manufacturer);
  
              if (null !== $existingManufacturer) {
                  $identity = $this->identityService->insert(
                      (string) $manufacturer->getIdentifier(),
                      Manufacturer::TYPE,
                      (string) $existingManufacturer['id'],
                      ShopwareAdapter::NAME
                  );
              }
          }
  
          if ($identity) {
              try {
                  $this->resource->getOne($identity->getAdapterIdentifier());
              } catch (ManufacturerNotFoundException $exception) {
                  $this->identityService->remove($identity);
  
                  $identity = null;
              }
          }
  
          if (null === $identity) {
              $manufacturerModel = $this->resource->create($params);
  
              $this->identityService->insert(
                  (string) $manufacturer->getIdentifier(),
                  Manufacturer::TYPE,
                  (string) $manufacturerModel->getId(),
                  ShopwareAdapter::NAME
              );
          } else {
              $manufacturerModel = $this->resource->update($identity->getAdapterIdentifier(), $params);
          }
  
          $this->attributePersister->saveManufacturerAttributes(
              $manufacturerModel,
              $manufacturer->getAttributes()
          );
  
          return true;
      }
docs: {@inheritdoc}
  
  @param TransferObjectCommand $command