code: public OpenpayFeesSummary getSummary(final int year, final int month) throws OpenpayServiceException,
              ServiceUnavailableException {
          String path = String.format(FEES_PATH, this.getMerchantId());
          Map<String, String> params = new HashMap<String, String>();
          params.put("year", String.valueOf(year));
          params.put("month", String.valueOf(month));
          return this.getJsonClient().get(path, params, OpenpayFeesSummary.class);
      }
docs: Retrieve the summary of the charged fees in the given month. The amounts retrieved in the current month may
  change on a daily basis.
  @param year Year of the date to retrieve
  @param month Month to retrieve
  @return The summary of the fees charged by Openpay.
  @throws OpenpayServiceException If the service returns an error
  @throws ServiceUnavailableException If the service is not available