beware of the agent studying abroad is to defraud the credit card number and the three-digit CVV2 code on the back of the card to commit fraud.

The three-digit CVV2 code on the back of the credit card is the security code of the credit card when conducting online or telephone transactions, and is usually used to confirm that the payer really holds the credit card during the transaction. Because some websites, especially overseas websites, don't need a password when paying by credit card online, they can complete the transaction only by card number, expiration date and CVV2 code, so the importance of CVV2 code is almost equal to password.

a CreditCard is a credit certificate issued by a commercial bank or a credit card company to a qualified consumer. The form of credit card is a card with the name of issuing bank, expiration date, number, cardholder's name and other contents printed on the front. Consumers with credit cards can go to special commercial service departments for shopping or spending, and then the bank will settle accounts with merchants and cardholders, and cardholders can overdraw within the specified amount.