It consists of the last three digits on the signature strip on the back of the card. The role of CVN is to improve the security of transactions and prevent unauthorized use. It is a series of numbers generated according to a specific algorithm, which is used to confirm the identity authentication of cardholders during the transaction. Using CVN can effectively prevent credit card theft and fraud, and protect the security of cardholders' funds. Banks and merchants will require CVN code to confirm the identity and legitimacy of cardholders when conducting indirect transactions such as online payment.