At all ticket windows at the WDW Parks (including water parks, DTD, TTC and Epcot International Gateway) we are able to take three forms of payment for any ticket transaction.
An unlimited number of Disney Gift Cards is considered as only one form of payment.
Other than Disney Gift Cards, each individual credit or debit or stored cash card or Resort KTTW is considered one form of payment.
And, of course, cash is considered a form of payment.