The payment process of group purchase is also risky and lacks guarantee mechanism. At present, most group-buying websites adopt the method of instant payment, and consumers pay directly to group-buying websites. After the group purchase service, the buyer is only the beginning of consumption, and the end of the group purchase is when the seller experiences the consumption. In this process once there are problems, need to refund, some non-standard website often excuse website attack, alipay has problems, and merchants in coordination and other reasons delay withdrawal, to the buyer's payment security buried hidden trouble. Due to the uneven quality of the current group purchase websites, this payment method completely transfers the risks to the consumers and provides opportunities for some criminals. If the group purchase websites abscond with the funds, the consumers will be helpless. No refund after expiration is the unwritten rule of group purchase. Although several websites have improved on this problem and adopted refund method to protect consumers' interests for expired group purchase coupons, most of them still adopt non-refund method to pocket such funds and keep them as their own. Even some websites that claim to be refundable have a hard time getting a refund