1. standardize the use of cards, and solve the problem directly from the root. 2. If it is real consumption, don't be afraid to check, and provide invoices and receipts directly as required. 3. If the receipt is not issued, it can be reissued and the POS machine can complete it. As for the invoice, you can find a proxy for this. 4. Take the initiative to contact the bank customer service to explain, because of some reasons, the invoice or small ticket was accidentally lost.