Customers who have already made a deal will be labeled as "Don't Buy" in the membership management. For new customers who clinch a deal, blacklists can be added to some software, such as Joyful, blacklisted customers. After placing an order, the transaction will be automatically closed. As long as the customer fails to pay within 30 seconds, the payment will not be closed after 30 seconds. Without the interception in member management, it is impossible to make a direct shot.