Banks use sophisticated AI to track "card testing" behavior. If a card is run through a known checker or used for multiple tiny "verification" transactions in a short period, the bank will likely flag the account as compromised and freeze your card immediately. How to Properly Verify Your Card Status
Hackers use automated scripts to test batches of stolen card data against a merchant’s payment gateway. They "check" the CVV by attempting tiny transactions to see which cards are still active.
Log in to see if your account is active and if there are any pending "verification" charges you don’t recognize.