code: @Override
  	public CashbillLog[] getLogs(String CorpNum, String MgtKey)
  			throws PopbillException {
  		if (MgtKey == null || MgtKey.isEmpty())
  			throw new PopbillException(-99999999, "관리번호가 입력되지 않았습니다.");
  
  		return httpget("/Cashbill/" + MgtKey +"/Logs", CorpNum, null, CashbillLog[].class);
  	}
docs: /* (non-Javadoc)
  @see com.popbill.api.CashbillService#getLogs(java.lang.String, java.lang.String)