The idea behind carding is simple. Carders, such as Bankloginscvvshop, Cardingcvvshop and Validccshoponline obtain huge lists of credit/debit card information. They "stuff" this data into checkout forms on online stores. Carders don't enter everything manually. Instead, they create bots that can test thousands of numbers at the same time.
For example, one of the biggest breaches included 2.2 billion cards. While websites have protection to block suspicious activity, carders have tools to keep things looking normal. Once card details are validated, they can use it everywhere