ABC's monthly cashback is a coupon. Because the Agricultural Bank of China held a daily cashback activity, from the 1st day of each month during the activity period, cardholders can receive a daily cashback voucher with deep affection through the ABC APP credit card. After successful collection, they can enjoy a random amount of cash back for online consumption in 18 yuan in that month, and each person can get cash back at most once a day. Therefore, the monthly cash back of ABC is a coupon.