According to the regulations, when a cardholder holds a credit card, the cashier must verify that the card number, expiration date, cardholder's name and security code on the back are clearly visible, and the credit card is valid. It's just that there are not many cashiers in China at present, and some foreign countries are very strict.

It is suggested that you can buy some small adhesive tapes as protection measures, which are safer in China and can be taken off in time when you go abroad.