public function getApplicationApiService()
    {
        $applicationService = new \Greenhouse\GreenhouseToolsPhp\Services\ApplicationService($this->_apiKey, $this->_boardToken);
        $apiClient  = new GuzzleClient(array(
            'base_uri' => ApiService::APPLICATION_URL
        ));
        $applicationService->setClient($apiClient);
        
        return $applicationService;
    }