1. GCA Is the Only Source of Purchase Events
One of the most common issues post-migration is that GCA and GTM both fire purchase events resulting in inflated revenue, broken attribution models, or silent duplication in GA4.
2. Consent Is Being Respected and Logged
GCA integrates with Shopify’s Privacy API, which means it should only fire events after consent is granted. But this only works if:
- Consent status is declared via Shopify’s Customer Privacy API
- No other banners or GTM-based consent logic are running in conflict
- Events like page_view and purchase are correctly gated
3. GCA Captures the Events You Actually Need
Out of the box, GCA captures only a handful of conversion events.
It does not fire:
- view_cart
- remove_from_cart
- begin_checkout (reliably)
- add_shipping_info
4. Shopify Diagnostics and GA4 Match in Real Time
Shopify provides basic diagnostics inside GCA. GA4 provides debug tools. But too few teams compare both environments after setup.
| Tool | Use Case |
| Google Tag Assistant | Confirms what tags fire and in what sequence |
| GA4 DebugView | Shows real-time payloads hitting GA4 |
| Shopify’s Pixel Diagnostics | Shows whether GCA fired at checkout or was blocked |
Recommended sequence
- Place a test order
- Check GCA firing in Shopify diagnostics
- Cross-verify GA4 DebugView for expected event names, parameters, and revenue
- Confirm consent status appears in Tag Assistant and is respected by all tags
If Shopify says “pixel fired” but GA4 has no data, there’s a silent block happening usually a consent or duplication issue.
For Melbourne ecommerce businesses using Shopify, these discrepancies should be resolved before campaign or website performance is evaluated. A CRO agency in Melbourne can use verified GCA and GA4 conversion data to distinguish genuine checkout friction from tracking errors, duplicated purchases or consent-related data loss.
5. Your Data Layer and Consent Flow Are Ready for What’s Next
Even if everything looks functional today, most teams overlook how fragile their implementation really is.
Ask:
- Are you ready to add Meta or TikTok to this setup?
- Can you export this data into BigQuery or Stitch for modelling?
- Does your consent logic scale to country-level regulation differences?
- Do you have version control on your events?
6. Final Thought
If your team “finished” GCA migration in a day, you didn’t migrate. You installed.
And without these five verification steps, your data is at risk not always visibly, but in the quiet gaps where consent, duplication, or attribution silently fail.
The best migrations are the ones no one notices because nothing breaks. That’s what this checklist protects.
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