Coupons can only be applied to an order during the time that the coupon is valid and are not valid with other promotions. Unfortunately, we cannot apply discounts to older orders if the discount was not valid at that time. Future sales can never be applied to past orders.
If your coupon code is not working, please make sure that you are logged into your account. Some discount codes do require customers to log into their account before the site will allow you to apply the discount to your order.
There is a limit of one coupon/promotion per order.
If you have any questions, please contact us by submitting a ticket.