We currently accept Paypal, Amazon Pay as well as Visa, MasterCard, Discover, American Express & Apple Pay. So yea, pretty much everything.
Discount codes can be applied during the checkout process, to reach this page add items to your cart and press the "Checkout" button from the cart drawer. On desktop devices, the discount input box will be located to the right of your contact information, on mobile devices the discount input box will be in the cart details drop-down.
It’s possible the promotion has ended, if you feel that isn’t the case go ahead and contact us and we’ll take a look for you.