According to today's headline data, most people can't use credit cards to send red envelopes and transfer money, but they can use credit cards to pay by scanning the QR code of merchants. Payment is limited by the system, which generally triggers the system risk control. The static code is used for many times in a row for large credit card consumption. This kind of continuous brush is generally limited to a few days.

A credit card is a bank card with a certain credit card limit, which can be repaid first and then within the credit limit. The card not only has the functions of deposit and withdrawal, transfer and consumption, but also can enjoy various forms of points, discounts, promotions and other activities. The secondary credit card is attached to the main credit card, with the same function and account (that is, the secondary credit card is included in the bill of the main credit card after use), but the card number is different. The cardholder of the secondary card must be the child, spouse or parent of the primary card.