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GA4 says 18 purchases, Shopify confirmed 10 - here's why

GA4 is a measurement layer. Shopify is the paid-order truth.

GA4 can miss, split, or duplicate purchase events because of consent-mode gaps, cross-device sessions, blocked tags, checkout-domain handoffs, and event de-duplication. Shopify confirms the order after money lands. When the two disagree, you need the disagreement in front of you, not hidden inside a blended dashboard.

jujugrowth lines up the three counts daily and read-only, then flags whether the likely cause is attribution-window inflation, GA4 loss, or a Shopify/backend truth gap.

What to check first

• Consent and blocked tags: purchases happened, but GA4 did not receive every event.
• Cross-device paths: the click and purchase happened on different sessions or devices.
• Event de-duplication: client-side and server-side events may be merged or dropped.
• Checkout handoff: the store confirmed the order, but analytics lost the browser trail.

How should I reconcile GA4 purchases against Shopify orders?

Put ad-platform claims, GA4 purchases, and Shopify orders next to each other for the same date window. Use Shopify as commerce truth, GA4 as the measurement layer, and the platform number as the claim that needs checking. jujugrowth does that comparison automatically after a read-only connection.

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