code: @Override
  	public StatementInfo getInfo(String CorpNum, int ItemCode, String MgtKey)
  			throws PopbillException {
  		if (MgtKey == null || MgtKey.isEmpty())
  			throw new PopbillException(-99999999, "관리번호가 입력되지 않았습니다.");
  		
  		return httpget("/Statement/" + ItemCode + "/" + MgtKey, 
  					CorpNum, null, StatementInfo.class);
  	}
docs: /* (non-Javadoc)
  @see com.popbill.api.StatementService#getInfo(java.lang.String, java.number.Integer, java.lang.String, java.lang.String)