The Anatomy of the Swipe: Making Money Move Contactless payment: Tap your card or device to pay without inserting it. Magnetic stripe: A strip on the back of the card that stores your account information. Chip: An embedded microchip that provides enhanced security. PIN: A personal identification number that you enter to authorize transactions. Signature panel: A space where you sign your name to verify your identity. Expiration date: The date after which the card is no longer valid. Card number: A unique identifier for your account. Security code: A three- or four-digit code that helps prevent unauthorized use.