CAS AP Series - Change Calculation Process

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6. The Change Calculation (AP-MX, EX)
This function is performed while the any total price is on the display.
PAY
5 0 0 0
PAY
Press PAY key. Enter a customer's payment. Press PAY key.
PAY
Press PAY key to escape.
NOTE: Customer's payment should be always bigger than the total price otherwise,
an error beep sound may be generated.