title: Magento remove promotional code in customer transactional emails
body: <p>My client does not want his customers to have a copy of the promotional code they used to minimize the chance they would create a new account and use it again. I am viewing the invoice and order receipt transactional emails, and there is only reference to order.getIsNotVirtual() which I assume inserts details about the order. How would I go about locating reference to the promotional code itself?</p>