Generally, online group purchase requires payment first, such as Meituan, Handan.com, etc. You can pay by online banking, Alipay or credit card. After payment, you will receive a verification code. When you go to the hotel, you will be told that it is a group purchase, and the waiter will ask you to provide the verification code, so you can wait for the meal and you don't need to pay any more. Of course, there is also a kind of group purchase, which is to spend a few dollars to buy some of them first, and then pay the rest in the store. You can also buy vouchers and go to the store to offset the actual consumption. For details, please refer to the introduction of group purchase.