McDonald's food card is a kind of dining card, which can be recharged. Just show this card before you check out, and the cashier will help you pull out the corresponding price of the food you bought (with this card, you don't have to pay cash). If the cash in the card runs out, you can also exchange this card for food under five yuan, such as a pie, two ice creams or a small coke or a small sprite, but this five yuan can't be used as cash!