code: private void addQueryParams(final Request request) {
          if (isoCode != null) {
              request.addQueryParam("IsoCode", isoCode);
          }
  
          if (continent != null) {
              request.addQueryParam("Continent", continent);
          }
  
          if (countryCode != null) {
              request.addQueryParam("CountryCode", countryCode);
          }
  
          if (lowRiskNumbersEnabled != null) {
              request.addQueryParam("LowRiskNumbersEnabled", lowRiskNumbersEnabled.toString());
          }
  
          if (highRiskSpecialNumbersEnabled != null) {
              request.addQueryParam("HighRiskSpecialNumbersEnabled", highRiskSpecialNumbersEnabled.toString());
          }
  
          if (highRiskTollfraudNumbersEnabled != null) {
              request.addQueryParam("HighRiskTollfraudNumbersEnabled", highRiskTollfraudNumbersEnabled.toString());
          }
  
          if (getPageSize() != null) {
              request.addQueryParam("PageSize", Integer.toString(getPageSize()));
          }
      }
docs: Add the requested query string arguments to the Request.
  
  @param request Request to add query string arguments to