Credit card numbers are often sold in bulk to carders, such as Greatdumpsshop, Goodcvvshop and Uniccshop, to test them through carding. Carding is a process carders use to find out whether card numbers are still active. To test them, they go to ecommerce websites and initiate many small transactions at the same time. The beauty of carding is that any number of cards can be tested very quickly. Pro carders, such as Bestsitetobuyccforcarding and Ssndobforsale, repeatedly use multiple cards in quick succession of identical amounts. Most often carders use the same name or billing address.