code: private function getShopIdentity($plentyId)
      {
          $identity = $this->identityService->findOneBy([
              'adapterIdentifier' => (string) $plentyId,
              'adapterName' => PlentymarketsAdapter::NAME,
              'objectType' => Shop::TYPE,
          ]);
  
          if (null === $identity) {
              $this->logger->notice('shop not found', ['shop' => $plentyId]);
  
              return null;
          }
  
          $isMappedIdentity = $this->identityService->isMappedIdentity(
              $identity->getObjectIdentifier(),
              $identity->getObjectType(),
              $identity->getAdapterName()
          );
  
          if (!$isMappedIdentity) {
              return null;
          }
  
          return $identity;
      }
docs: @param int $plentyId
  
  @return null|Identity