loyalty card
noun [ C ] UK uk/ˈlɔɪ.əl.ti ˌkɑːd/ us/ˈlɔɪ.əl.t̬i ˌkɑːrd/ (US rewards card)
（商业企业发给顾客的）会员卡
a card that is given to a customer by a business, used by the business to reward the customer for buying goods or services and to record information about what they buy