code: @Override
  	public String getPrintURL(String CorpNum, String MgtKey)
  			throws PopbillException {
  
  		return getPrintURL(CorpNum, MgtKey, null);
  	}
docs: /*
  (non-Javadoc)
  @see com.popbill.api.CashbillService#getPrintURL(java.lang.String, java.lang.String)