code: protected XmlHttpResponse callCheckServiceImpl(String urlSymbolKey, String soapAction) {
          String url = getSymbol(urlSymbolKey).toString();
          XmlHttpResponse response = getEnvironment().createInstance(getCheckResponseClass());
          callSoapService(url, getCheckTemplateName(), soapAction, response);
          return response;
      }
docs: Creates check response, calls service using configured check template and current row's values and calls SOAP service.
  @param urlSymbolKey key of symbol containing check service's URL.
  @param soapAction SOAPAction header value (null if no header is required).
  @return filled check response