I remember when we first went to Disneyland Hongkong, we used vouchers for the entrance. It was given by a friend. On our next trip to Hongkong, my nephew gave us vouchers for Ocean Park, another theme park like Disneyland. From what we gathered, the voucher can be purchased earlier so you get a certain discount. We are now in search of vouchers that we can buy for Universal Studio in Singapore. And maybe another voucher for Resorts World which is in the same location.
Well we can get discount tickets here, as theme parks generally have their own "voucher" programs i guess you might call them. Generally, they set aside a certain amount of tickets to be sold for less than Full price. It is a way you can get tickets at less than full price. Call the special program what you like, it does often results in less expensive tickets which of course everyone likes, It is a good thing to find and to see.