That's how they did it when we did the hot glass class. The price you pay is an entry price..meaning, you may select to make a piece that is priced higher than the reservation price on line. Therefore, you pay the difference when you complete the class and will get your discount for the full amount at that time. If you do not make a more expensive piece then the 5% is credited back to your account. The other option is to book the class on embarkation day. It fills up quickly so if you go this route, don't delay in signing up for the class. Going this route ensures you get the 5% off whatever piece you make without having to get the credit to your account.