What if I forget or miss entering a coupon code?
If you missed entering it by accident rather then being unaware, then send an email to email@example.com immediately.
If your order has been marked as shipped it is too late.
If the coupon has expired it is too late.
If the order was placed after the coupon was announced and before if was expired and the order has not shipped then store credit will be issued for the value that would have been saved if the coupon was applied at the time of purchase.