I set up the Facebook Conversion API for a purchase event and set everything up properly, I guess. The deduplication is working, but there is another browser-based purchase event coming from nowhere. any ideas on how to fix it?
This means that this event is being sent from some other source. For example, you may have fbq in your site code, or some Meta integration/plugin running (although this is unlikely - it would generate a PageView as well). So I recommend checking the site code for fbq facebook scripts.
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Yeah, I figured it out! Previously, I had created a purchase event using the FB Event Tool, and now I created the same event with GTM, which was causing the issue