Is there a way to create a coupon to give a 50% discount but limit it to the first item in the cart? I don't wnat the person to add the whole store and get 50% off everything...
Like those Bed Bath And Beyond coupons they send out that give you 35% off one item from the store.
I'm not sure how you would achieve this in Shopify. But, I did find these articles from Shopify. Maybe they'll help.
All the Best :)