BOC Digital Credit Card is a kind of virtual credit card. Compared with the traditional physical credit card, its account function is the same. After the application is successful, the bank will send the card number, security code and expiration date of the credit card to the mobile phone number reserved by the cardholder by SMS. This information is an important voucher for credit card transactions, which needs to be kept properly and should not be easily leaked to others. Since BOC Digital Credit Card has no physical card, the cardholder can make online consumption through electronic devices such as mobile phones. This form of virtual credit card provides a more convenient and safer payment method, and also reduces the risk of loss or theft of physical cards.