PromoCodeField
3 variants · cart · for cart, checkout pages
collapsed
a quiet « Code promo » link that opens the field: the default, so the cart does not tempt a visitor to go hunting for coupons
card
a titled card at the top of the order summary: shops where codes are common and the field should be seen at once
inline
the field and its button in the totals area, no frame: a compact summary with a few lines