Cash coupons are not change. You can inform the seller about the situation, apply for a refund first (after the seller agrees, the refund is successful, and you still get 2 cash coupons), and then put this product in the shopping cart, and then choose another product in the same store. If the two products are more than or equal to 2 yuan, they will also be put in the shopping cart, and then go to the shopping cart for settlement.