docs: @Override
  	public StatementInfo[] getInfos(String CorpNum, int ItemCode,
  			String[] MgtKeyList) throws PopbillException {
  		if (MgtKeyList == null)
  			throw new PopbillException(-99999999, "관리번호 배열이 입력되지 않았습니다.");
  		
  		String PostData = toJsonString(MgtKeyList);
  		
  		return httppost("/Statement/" + ItemCode, CorpNum, 
  					PostData, null, StatementInfo[].class);
  	}