code: private function getLinkedProducts(Product $product, $type = LinkedProduct::TYPE_SIMILAR)
      {
          $result = [];
  
          foreach ($product->getLinkedProducts() as $linkedProduct) {
              if ($linkedProduct->getType() === $type) {
                  $productIdentity = $this->identityService->findOneBy([
                      'objectIdentifier' => $linkedProduct->getProductIdentifier(),
                      'objectType' => Product::TYPE,
                      'adapterName' => ShopwareAdapter::NAME,
                  ]);
  
                  if (null === $productIdentity) {
                      continue;
                  }
  
                  /**
                   * @var EntityRepository $productRepository
                   */
                  $productRepository = $this->entityManager->getRepository(Article::class);
  
                  $productExists = $productRepository->find($productIdentity->getAdapterIdentifier());
  
                  if (!$productExists) {
                      continue;
                  }
  
                  $result[$productIdentity->getAdapterIdentifier()] = [
                      'id' => $productIdentity->getAdapterIdentifier(),
                      'number' => null,
                      'position' => $linkedProduct->getPosition(),
                      'cross' => false,
                  ];
              }
          }
  
          return $result;
      }
docs: @param Product $product
  @param string  $type
  
  @return array