days since the deadlineShopify auto-upgraded every non-Plus checkout on August 26, 2026.
Your Shopify checkout has already changed. Is your tracking still firing?
On August 26, 2026, Shopify retired the legacy "Additional Scripts" system for every non-Plus store. If anything in your checkout depended on it — conversion pixels, custom fields, script-based apps — it may have stopped working that day. Orders keep processing normally, so nothing looks broken. The first sign is usually a gap in your ad reporting.
BasicShopifyAdvancedPause & BuildPlus (already migrated in 2024–2025)
What can break
Three categories are most commonly affected, based on how Shopify and migration guides describe the change.
Tracking & ad attribution
Google Ads conversion tracking
Meta/Facebook pixel firing
GA4 & Google Tag Manager containers pasted into Additional Scripts
Affiliate tracking tags
Checkout customizations
COD surcharges added via script
Custom phone/address verification fields
Conditional payment method visibility
Minimum-order enforcement logic
Apps & integrations
Any app injecting functionality via script tags on Thank You / Order Status pages
Order-tracking widgets
Post-purchase surveys & referral prompts
The dangerous part: the failure is silent.
Orders keep processing normally after the auto-upgrade — nothing looks visibly broken in the checkout itself. Tracking simply stops firing and custom checkout logic quietly disappears. That is exactly why this is worth checking now rather than assuming you were fine: a store can run for weeks on broken attribution before anyone notices, and every day of that is ad budget being spent blind.
What to check now
If you already migrated, this is a verification pass. If you didn't, Shopify migrated you — and this is how you find out what it cost you.
STEP 1
List what used to be there
Check your Additional Scripts and Thank You page boxes, and any checkout-related apps, for anything that is now inert.
STEP 2
Map it to replacements
Tracking belongs in Customer Events / Web Pixels now. Confirm each app you rely on actually supports Checkout Extensibility.
STEP 3
Place a real test order
This is the only way to know. Order from your own store and confirm each tracking event actually fires, on desktop and mobile.
STEP 4
Reconcile your ad reporting
Compare conversions reported in Google Ads and Meta against real orders in Shopify since August 26. A gap that starts on that date is your answer.
Not sure if you're affected — or already migrated correctly?
Every CheckoutGrade audit includes a check of your Checkout Extensibility migration status alongside checkout, payment, shipping, and mobile findings — real findings from a human expert, not a generated report.
This page summarizes publicly available Shopify migration guidance as of September 2026 for general informational purposes — it isn't official Shopify documentation. Always confirm your store's specific situation against Shopify's own help center or your app vendors directly.
