Agricultural Bank of China CVD2 code 2 (the last three codes) does not need to open online banking. It is used for network card-free payment. The card number, the validity period of the card and the last three codes constitute the payment conditions, and there is no need to pay passwords or dynamic passwords or K-treasures. At this time, the last three codes are equivalent to passwords. So protect it as well as your payment password. You can get a credit card and cover it with something. Only you know, which is good.