I don’t know if this is of any help, but if on your visit to WDW you are staying in one of the Disney Resorts (excluding Dolphin & Swan), then you can ask for your door key card to act as a Disney Visa Card or as they like to call it “Your Key to the world”, for the duration of your visit.
Basically this means that you don’t have to carry any cash around with you (very useful in the water parks) and also allows you to buy almost anything in the parks and everything will be charged back to your room, then when you check out you just use a standard credit/visa card to square up! No Charges, No Hastle!
Oh by the way, it’s very easy to get carried away spending with all the cool Disney stuff available, so just set yourself a limit each day!
Hope some of this helps,
Enjoy your trip…“Happy Spending”