code: private void addQueryParams(final Request request) {
          if (customerName != null) {
              request.addQueryParam("CustomerName", customerName);
          }
  
          if (friendlyName != null) {
              request.addQueryParam("FriendlyName", friendlyName);
          }
  
          if (isoCountry != null) {
              request.addQueryParam("IsoCountry", isoCountry);
          }
  
          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