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When Meta's data says one thing and Shopify says another — which do I trust?

Attribution discrepancy causes operators to misread profitability — very common confusion

Trust Shopify for revenue. Use Meta for directional signals.

Due to iOS14 privacy changes, Meta's reported conversions are partially estimated using modeled data. Your Shopify dashboard shows actual orders. The discrepancy is usually 20–40% — Meta often over-reports (via view-through attribution) or under-reports (when iOS blocks the click event entirely).

  • The right framework: Use Meta data to compare creatives against each other (which angles get more ATCs, which get lower CPM) — the directional comparison is still valid even if absolute numbers are off.
  • Use Shopify data for actual profitability decisions: Your real revenue, your real orders, your real conversion rate. If Meta says 10 purchases and Shopify shows 7, you made 7 sales.
  • UTM parameters help: Add UTM parameters to your ad URLs. Use Shopify's source report (or GA4) to see which campaign UTMs drove actual purchases. This triangulates between Meta's attribution and your actual order data.
  • The MER check: Take your total Shopify revenue for the week and divide by your total Meta ad spend. That's your real Marketing Efficiency Ratio — more accurate than any single platform's reported ROAS.

See this in practice: Read Your Data

More on Reading Ad Data

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Original content by First Sale Society — . Free, no paywall.