1. First, bring back the goods and the receipt to ensure that the information of the goods and the receipt is consistent. Press the "Refund" button on the cash register to enter the refund interface.

2. Secondly, in the refund interface, you need to enter the refund amount. The cashier will automatically calculate the actual amount of the refund and print the refund amount on the receipt.

3. Finally, give the refund to the customer in the form of cash or bank card, and ask the customer to sign the receipt to confirm that the refund has been completed.