What broke when we counted conversions twice (and the boring test that fixed it)

<p>We run a small Israeli tools and home-improvement store, <a href="https://ramo.co.il" rel="noopener noreferrer">ramo.co.il</a>, on Next.js and Vercel. A few weeks ago our ad dashboards said we were doing great. Our bank account disagreed.</p> <p>The cause was dull: the purchase event fired twice on the thank-you page. Once on the first render, and again after a client-side navigation re-mounted

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