code: @Override
      public ChargeInfo getChargeInfo(String CorpNum, MessageType MsgType)
              throws PopbillException {
          return httpget("/Message/ChargeInfo?Type=" + MsgType.name(), CorpNum, null, ChargeInfo.class);
      }
docs: /*
  (non-Javadoc)
  @see com.popbill.api.MessageService#getChargeInfo(java.lang.String, com.popbill.api.message.MessageType)