 As a payment card is swiped through a card reading device, referred to as a point of interaction (POI) device, at the merchant location or point of sale, the device immediately encrypts the card information.A device that is part of a PCI validated P2Pe solution uses an algorithmic calculation to encrypt the confidential payment card data.From the POI, the encrypted, indecipherable codes are sent to the payment gateway or processor for decryption.