Perform strong customer authentication

If IPG includes in the response the following parameter processor.requiredActionOnTerminal, then terminal will need to ask cardholder for strong customer authentication.

• If requiredActionOnTerminal = 'ContactlessSingleTapPIN', then terminal will need to prompt for PIN entry. No need to read the card again. This value will only be sent back in response, if terminal has sent the following value under the array features SINGLE_TAP_PIN_SUPPORT.
• If requiredActionOnTerminal = 'FallbackToChipAndPIN', then terminal will need to prompt for contact card read and PIN entry.

Once single tap PIN was performed, then terminal will need to send singleTapPinPerformed = true.

There's no need to include a reference to the first attempt.