Credit card numbers cannot be written casually. The VISA card number required by foreign websites generally refers to the VISA credit card number, which is 16 digits. Then you are asked to enter the CVV code, credit card validity period, cardholder’s English name and other information. If you have a CCB VISA credit card, that’s no problem. But if it is a CCB Long Card savings card, it will not work because it has a 19-digit card number, no CVV code, no expiration date, and no English name of the cardholder.