code: public function getJobApiService()
      {
          $apiService = new \Greenhouse\GreenhouseToolsPhp\Services\JobApiService($this->_boardToken);
          $apiClient  = new GuzzleClient(array(
              'base_uri' => ApiService::jobBoardBaseUrl($this->_boardToken)
          ));
          $apiService->setClient($apiClient);
          
          return $apiService;
      }
docs: The Job API Service does not require an API key.  This service interacts with
  the GET endpoints in the Greenhouse job boards.