Abstract: A method of remotely configuring a pin-pad terminal involves a computer server receiving a merchant identifier over a network from a communications device associated with the pin-pad terminal. The computer server confirms from the merchant identifier that an entity associated with the communications device is authorized to use the pin-pad terminal, and authenticates the pin-pad terminal from a cryptographically-signed datum received from the communications device. The computer server then transmits to the pin-pad terminal via the communications device a configuration payload for installation in the pin-pad terminal. The configuration payload includes at least a payment symmetric cryptographic key set uniquely associated with the pin-pad terminal. The payment symmetric key set configures the pin-pad terminal to effect secure electronic payment via the communications device.

Abstract: A method of authorizing a financial transaction involves a payment terminal receiving, from a payment card interfaced with the payment terminal, application data in response to a predetermined authorization amount provided to the payment card by the payment terminal. The application data comprises an account number uniquely associated with the payment card. The payment terminal generates an adjusted authorization amount based on the account number and from a preliminary authorization amount received at the payment terminal, provides the payment card with the adjusted authorization amount, receives a cryptogram from the payment card in response, and provides notification of authorization of a financial transaction for the adjusted authorization amount in accordance with a confirmation that the cryptogram received at the payment terminal from the payment card was generated by the payment card from the adjusted authorization amount and from a cryptographic key uniquely associated with the payment card.