What Can You do with Plastic prepaid MasterCard? You can use your Prepaid plastic QCard or Gift card anywhere MasterCards/Debit cards are accepted. Be sure to know your card balance before you shop—the merchant or service provider may not be able to retrieve this information for you. When you’re ready to make your purchase, give the cashier your card or, if asked, swipe your card at the terminal. The purchase amount will automatically be deducted from the card balance.