When binding, you only need to enter the basic information on the credit card, that is, the card number, expiration date and CVV2/CVC verification code on the back of the card.
There may also be a SMS verification code. The front of the card is engraved with the card number and the validity period, such as 05/20, which means it will expire in May 2020.
Enter 0520 when typing on the web page, and that's it. The CVV2/CVC code is the three digits to the right of the signature on the back of the card.