code: private function getCustomerGroupIdentity(array $plentyCustomer)
      {
          return $this->identityService->findOneBy([
              'adapterIdentifier' => (string) $plentyCustomer['classId'],
              'adapterName' => PlentymarketsAdapter::NAME,
              'objectType' => CustomerGroup::TYPE,
          ]);
      }
docs: @param array $plentyCustomer
  
  @return Identity