How to resolve GA4 Pixel tracking issue on checkout pages?

Shopify Apps
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Topic summary

GA4 events on Shopify checkout were not firing due to Content Security Policy (CSP) blocking Google endpoints (e.g., analytics.google.com, region-specific collectors). Impacted events included page_view, begin_checkout, and add_payment_info. Console errors and posted CSP headers showed missing connect-src allowances for *.google-analytics.com and *.analytics.google.com.

Workarounds reported:

  • Custom pixel using Shopify analytics events, then pushing to gtag with transport_url set to https://www.google-analytics.com.
  • Thank-you page tagging for conversions when checkout tracking isn’t possible.
  • GTM remains restricted at checkout for non‑Plus stores; theme.liquid edits do not affect checkout.

Reference documentation from Google specified required CSP directives for GA4 (script/img/connect-src to *.googletagmanager.com, *.google-analytics.com, *.analytics.google.com, and, with Signals, additional Google domains).

Vendor responses and outcome:

  • Shopify initially directed merchants to Google; community argued Shopify must update checkout CSP.
  • Multiple users reported a fix rolled out around April 11–13, 2023. Later updates note 90–100% conversion match via native GA4, and reduced discrepancies (~10%) for manual dataLayer setups, suggesting a Shopify-side update.

Current state: Largely resolved for native integration, but some still see missing purchase events (e.g., iDEAL/system-browser flows). Discussion remains open for edge cases.

Summarized with AI on December 15. AI used: gpt-5.
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UPDATE:

I’ve been talking with Google and had a call with them. They were confused why the tag wasn’t firing correctly even after correct installation. We ran out of time and had to reschedule for another appt. I was able to get ahold of Shopify about the CSP issue and they told me Google tag manager won’t work on any shopify stores that aren’t on a shopify plus plan. We’ve had our same plan since 2015 and have been grandfathered in with really good rates and things, so we have no interest in swapping to a different plan that does little for us aside from making us pay more for less. However, this poses a serious issue now that we can’t connect our site to GA4. Don’t know if anyone else is on a custom plan too, or even just not a shopify plus one, but just throwing it out there as another potential to look at for anyone else still struggling with this.