Fraud-prevention services and features, such as Address Verification Service (AVS), help verify street numbers before the merchandise is shipped. CVC2 (MasterCard) and CVV2 (Visa) are new card verification and validation methods designed to minimize Internet and mail order/telephone order fraud. These methods allow greater security when merchants process transactions where the customer's credit card is not present, and they are some of the security measures available that can help you prevent fraudulent credit card purchases and save your business money.