maybe calculate 40% of the room rate for your ressie...and hold back that amount to pay at arrival? That way if you do get a code, you are already apid in full, if not, you have it set aside anyway and can just pay once you chek in. That's what I would do ( I would call WDW and get their calculations of taking 40% off , just to make sure)
Have a great trip!
Have a great trip!