code: public static PaytrailService createPaytrailService() {
  		IOHandler ioHandler = new HttpClientIOHandler();
  		Marshaller marshaller = new JacksonMarshaller();
      String merchantId = SystemUtils.getSettingValue("paytrail.merchantId");
      String merchantSecret = SystemUtils.getSettingValue("paytrail.merchantSecret");
  		return new PaytrailService(ioHandler, marshaller, merchantId, merchantSecret);
  	}
docs: Creates a paytrail service instance
  
  @return created paytrail service instance