: Require the 3- or 4-digit security code (CSC) and use AVS to check if the billing address matches the card issuer's records.
: Monitor the frequency of payments from the same IP address, billing address, or device. Rapid-succession attempts are a major red flag. Paypal Carding.txt
To combat these evolving threats, businesses should implement a layered defense: : Require the 3- or 4-digit security code
: Because stolen cards are often canceled quickly, attackers must test the data to see if it still works. They use automated scripts to submit many low-value purchase requests (sometimes called "micro-transactions") on a merchant’s eCommerce site. The Impact on Businesses
: Once a card is validated, it is either resold at a higher price or used to buy physical goods and gift cards, which are then liquidated for "clean" money. The Impact on Businesses