code: public function process()
      {
          $this->validate();
  
          $itemIdentifier = $this->hasRequestParameter('itemDefinition')
              ? $this->getRequestParameter('itemDefinition')
              : null;
  
          if (!is_array($itemIdentifier)) {
              $itemIdentifier = [$itemIdentifier];
          }
  
          try {
              if (!$this->getRunnerService()->getTestConfig()->getConfigValue('itemCaching.enabled')) {
                  common_Logger::w('Attempt to disclose the next items without the configuration');
                  throw new common_exception_Unauthorized();
              }
  
              $response = [];
              foreach ($itemIdentifier as $itemId) {
                  //load item data
                  $response['items'][] = $this->getItemData($itemId);
              }
  
              if (isset($response['items'])) {
                  $response['success'] = true;
              }
          } catch (\Exception $e) {
              $response = $this->getErrorResponse($e);
          }
  
          return $response;
      }
docs: Get item data by identifier
  
  Validate required fields.
  Get item data by given identifier
  
  @return array
  @throws