Yes! Adding a discount code to your recurring order is easy. All you have to do is enter your code into the discount/promotions box at the checkout to apply the discount to your ongoing order.
If you already have a recurring order set up and would like to add or swap a code, all you have to do is update your payment information and add a new code at the checkout before your next order processes, or by cancelling the recurring order in your account and starting fresh.
Updating your payment information can be done on your recurring order page.