Understanding GA4 and Meta Ads Attribution DifferencesUnderstanding GA4 and Meta Ads Attribution Differences
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Your GA4 and Meta Ads Manager will never show the same numbers. That's not a bug.
GA4 uses last-click attribution with a 30-day window. Meta uses view-through + click attribution with a 7-day default. They're measuring different things.
The real question isn't why don't they match
it's how big is the gap?
Under 20% difference = acceptable. Over 40% = your tracking is broken.
Most Shopify brands I audit are sitting at 60–80% discrepancy. That's not attribution — that's missing data.
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