You can apply your promotional code at the payment confirmation page in the Atome app.
Steps:
1. After you have scanned the QR code with your Atome app at the cashier, you will see a confirmation page showing the total purchase amount and breakdown details of each repayment.
2. Select "Promotion/voucher"
3. Enter the promotional code you wish the apply and click "Confirm"
4. You should see the total amount being adjusted to (original - promotional code amount). Please check the details before clicking "Pay".