What it is
A discount in exchange for an email. The shopper types their address; their own single-use code appears on screen right away and is already applied to the cart.
When to use it
- Your store is new to the visitor and you want the email more than the margin.
- You run ads and want a second chance to sell after the first visit.
- You have a coupon problem: shared codes keep turning up on deal sites.
Why it works
A code that shows instantly converts better than one that “arrives in your inbox” — no tab switch, no spam folder. Unique codes mean a leaked code is worth exactly one order, so the offer can stay generous.