that's the manager card.

In general, when you see the manager give a 51% discount to outsiders, that's illegal operation.

In general, employees who are at work on the same day can enjoy a 51% discount for meals on the way (not counting after work).

In other cases, all employees will get a 7.5% discount.

McDonald's POS machine (cash register) will order the meal every time and press the checkout button. When you click on any one of them, the system will prompt: Please swipe the manager card to confirm. At this time, the discount price can be displayed, otherwise the POS machine will be booked at the original price (which is very troublesome, and the cashier error will be caused)

And when you return the meal (McDonald's can return the meal), when the single transaction is too large, you need to use the card to confirm (to prevent misoperation).