A device for processing electronic payments for the purchase of goods or services is provided. The device includes one or more computer processors in communication with non-transitory computer readable data storage and a display. The data storage includes instructions stored thereon that, when executed by the one or more processors, cause the device to execute a transaction process including receiving purchase data representing one or more goods or services to be purchased, receiving user input to effect a payment transaction, determining a total transaction amount from the purchase data, reading payment credentials from a purchaser's payment device, sending a payment request, receiving data representing a received one time password (OTP), sending the received OTP to the third party authorization server for authentication against a OTP sent by the third party authorization server to a mobile device, and receiving data representing successful authentication from the third party authorization server.