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Prevent double counting

Why one pixel should only be sent by one app.

ROASaurus sends every event twice on purpose: once from the browser and once from the server, with the same event id. Meta, TikTok, Snapchat, Pinterest, Reddit, OpenAI Ads, AppLovin and Spotify use that id to keep one copy. X, Microsoft, Taboola, LinkedIn, Criteo, AdRoll and Outbrain only get the server event.

Double counting happens when another app also sends the same pixel (for example Shopify's Facebook & Instagram channel data sharing, the TikTok app, or a pixel pasted in your theme). Those use different event ids, so the platform sees two purchases.

Fix

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