Unfortunately, we cannot retroactively apply discount codes to orders that have already been placed.
However, here are your options:
Order not yet shipped? Email us at contact@circuitmess.com with your order number and the discount code. We may be able to cancel the order so you can re-place it with the code applied.
Order already shipped? Unfortunately, we can't adjust the price after shipping. But hang onto that code — most of our discount codes are valid for a period of time, so you can use it on your next order!
Note: Discount codes cannot be applied to items already on sale.