By using that action you can set values displayed on ticket numberpad, payment screen tendered amount and payment screen payment due amount.
Also we store these values to read from actions.
{:NUMBERPAD} Reads numberpad value.
{:PAYMENTDUEAMOUNT} Reads payment screen payment due amount.
{:TENDEREDAMOUNT} Reads payment screen tendered amount value.
Breaking Change: NUMBERPAD also returns tendered amount on previous versions. Now we should use TENDEREDAMOUNT instead.