Use the "China UnionPay Express" APP to inquire, and inquire through the POS brand's own APP or small ticket.

1. Use the "China UnionPay Express" APP to inquire: This is an APP officially produced by China UnionPay, which can inquire all consumption records and detailed MCC codes. By binding the credit cards of various banks to APP, you can query the transaction records of POS machines.

2. Inquire through the POS brand's own APP or receipt: All transaction details of POS card swiping can be viewed through the receipt, which has its own MCC code. Some POS brand apps also have transaction details, including MCC codes, and only some POS brands can query MCC codes.