Trả tiền mặt / Cash Back do not become available for use until ngày days after your order is delivered to you.
Please note that Trả tiền mặt / Cash Back remain pending in case the order is cancelled or returned. Pending Trả tiền mặt / Cash Back cannot be used as a payment method.
Once the Trả tiền mặt / Cash Back become available (=Total Trả tiền mặt / Cash Back earned - Trả tiền mặt / Cash Back used - Trả tiền mặt / Cash Back pending), you can use them like cash to pay for any purchases.