1. When purchasing coupons, check whether there is a clause in the webpage: after the buffet expires, the money will be automatically returned to the account paid by the consumer. If you have this, you can not directly consume it, and let it be returned automatically when it expires. Generally, these volumes are sold through intermediaries. If you don't go to a physical store, the cost of the buffet roll will not be transferred to the buffet shop, but will remain in the intermediary. If you don't spend it, the intermediary will automatically return the money to your account according to your due date.

2. If before you buy the roll, the consumption inside doesn't indicate "automatically return the roll after expiration", you can call the intermediary and negotiate with the other party to see if you can return it. If you really can't, you will be admitted! Be cautious about the next online shopping, and pay attention to the problem of situation one.