Article

Handling Duplicate Pixel and Conversions API Events

Meta for Developers Free Advanced

Running pixel and CAPI together without matching event_ids just means you're double counting, not building redundancy. This page is the fix.

  • Explains exactly how Meta deduplicates a browser event and a server event: same event_name and same event_id within 48 hours
  • event_id must be an identical string on both sides, an order ID or generated UUID both work as long as they match
  • Shows what 1 event from 2 sources versus 1 event from 1 source means inside Events Manager, the fastest health check for your setup
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The question it answers

  1. How do I set up Business Manager, the Meta pixel and Conversions API before running ads?

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  4. This is the source of truth Meta itself maintains, so when third-party tutorials disagree this is the page that settles it. Meta for Developers Article Conversions API: Get Started Meta for Developers
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  6. Read this before touching any settings so you understand why CAPI exists, not just how to click through it. Meta Business Help Center Article About Conversions API Meta Business Help Center
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