A supplement brand discovered their "exclusive" 20% off code had been shared on 14 coupon sites. They were hemorrhaging margin on every order.

It started innocently enough. They sent a welcome email with a 20% off code: WELCOME20. Two weeks later, that code appeared on RetailMeNot, Honey, and a dozen smaller coupon extension sites. Every customer checking out — even first-time buyers who would have paid full price — saw the code autofilled in their discount box. What was supposed to be a targeted welcome incentive became a universal 20% discount on the entire store.

The cost was staggering. Over $40,000 in unnecessary discounts over three months. Full-price customers trained to search for codes before buying. Margin erosion across every order. And the worst part: the code could not be turned off without breaking the active welcome flow that was generating $15,000 a month in attributed revenue.

Dynamic coupons solve this permanently. Klaviyo generates a unique, single-use code for every recipient. Each code works once, for one person. If someone shares it, it is already used. Coupon extensions cannot autofill it because every code is different. Your discount strategy works exactly as intended — targeted incentives for specific people at specific stages of the customer journey.

We implement dynamic coupon systems in Klaviyo. Unique codes in welcome flows, winback sequences, VIP campaigns, and every touchpoint where you use discount incentives. Your margin stays intact.