As a pp mentioned, there are only so many ways you can pay for your WDW vacation. When you make your booking you must pay for your deposit at that time (either the equivalent of one night's stay for a room only booking or $200 for a vacation package). After that you can call and make any interim partial payments that you want to make. If you have a vacation package you must pay the remaining balance by the 45day mark before your vacation begins. If you have a room only booking, the balance is due when you check in.
Is that the information you were wanting? Or were you looking at forms of payment- credit card, debit card, gift cards, etc.?