docs: @Override
  	public StatementLog[] getLogs(String CorpNum, int ItemCode, String MgtKey)
  			throws PopbillException {
  		if (MgtKey == null || MgtKey.isEmpty())
  			throw new PopbillException(-99999999, "관리번호 가 입력되지 않았습니다.");
  		
  		return httpget("/Statement/" + ItemCode + "/" + MgtKey + "/Logs",
  					CorpNum, null, StatementLog[].class);
  	}