code: public MessageListResult v2GetUserMessages(String username, int count, String begin_time, String end_time)
              throws APIConnectionException, APIRequestException {
          return _reportClient.v2GetUserMessages(username, count, begin_time, end_time);
      }
docs: Get message list from user's record, messages will store 60 days.
  @param username Necessary parameter.
  @param count Necessary parameter. The count of the message list.
  @param begin_time Optional parameter. The format must follow by 'yyyy-MM-dd HH:mm:ss'
  @param end_time Optional parameter. The format must follow by 'yyyy-MM-dd HH:mm:ss'
  @return MessageListResult
  @throws APIConnectionException connect exception
  @throws APIRequestException request exception