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Carders, such as Unicccreditcard, Cvvshoplvlogin and Freedumpswithpin2019, obtain credit card numbers from closed marketplaces or by compromising a payment channel. They don't know the quality of these numbers. Freedumpswithpin and Atmdumpswithpin make bots that perform repeated purchases on many merchant websites. Each time they test a number against a payment system to get valid information. The same card can be tested thousands of times in a short period of time. Carding forums are hidden, and payments are performed with cryptocurrency. Carders can easily hide their identity.