code: @Override
  	public String getPopUpURL(String CorpNum, int ItemCode, String MgtKey) throws PopbillException {
  		if (MgtKey == null || MgtKey.isEmpty())
  			throw new PopbillException(-99999999, "관리번호 가 입력되지 않았습니다.");
  	
  		return getPopUpURL(CorpNum, ItemCode, MgtKey, null);
  	}
docs: /*
  (non-Javadoc)
  @see com.popbill.api.StatementService#getPopUpURL(java.lang.String, int, java.lang.String)