CVV verification is a separate fraud prevention tool. With AVS, the system checks a customer's address against the address on file with their card issuer. With CVV verification, the system verifies the customer's correct CVV — a three or four-digit number printed on the customer's credit card. CVV verification ensures a customer has access to both the credit card and CVV numbers, making it harder to use stolen credit card data.Businesses often use both AVS and CVV verification to avoid scammers.