1. Your credit card number is your password and should be kept properly. Chinese credit cards do not require a password, but given the domestic environment, it is still recommended that you use a password.

2. Foreign credit cards are for credit consumption, and merchants must confirm that the purchase is made by the person themselves before they can provide goods or services. If the credit card holder finds that he has not received services from the merchant and directly reports to the credit card company that "this purchase was not authorized by the cardholder", the credit card issuing company will return the money to you until the merchant finds a way to provide you with goods or services. Only with evidence can the money be redirected to it.