Conventional Card

"When a customer swipes a card, the card's account number, expiration date, billing ZIP code, and security code are sent to a front-end processor working for the merchant and acquiring bank. The processor forwards the information through the relevant card association to the issuing bank, which verifies the account and checks whether sufficient credit is available. Approval travels back through the same chain to the merchant, usually within seconds, although the merchant is not actually paid until a later settlement process."