Guide28 September 2026 · 7 min read
Measure coupon extension impact with holdouts
Before/after comparisons mislead. Here's what to measure, how to do it yourself with GA4 and your dataLayer, and why holdouts are the honest answer.
Author:Benson
Practical, vendor-neutral guides to measuring what coupon extensions do on your store.
Before/after comparisons mislead. Here's what to measure, how to do it yourself with GA4 and your dataLayer, and why holdouts are the honest answer.