Consumers use credit and debit cards as a convenient way to make transactions and buy goods online. Carders use credit cards for the same reason – it's convenient. Carding is a process of attacking an online store using someone else's credit or gift cards. In 2019, a single attack exposed over 100 million of card numbers.
Different services, such as Cvvshop2019, Cvvdumpsites and Goldendumpscc, offer these numbers in bulk. Oftentimes one number costs a few cents per card. Carders also use bots to test credit card numbers with small-value purchases. Valid cards can be exchanged for untraceable gift cards.