Shopify is deprecating checkout.liquid, and your tracking may break in the move
The forced move to checkout extensibility relocates where your scripts and pixels run. Tags that worked on checkout.liquid often stop firing on the new checkout, and the breakage is invisible until your conversions drop.
Signs this is happening to you
- Shopify is warning that checkout.liquid is deprecated and you must upgrade
- After migrating, GA4, Meta, or Google Ads conversions dropped or stopped
- Post-purchase upsells, surveys, or scripts no longer run on the thank-you page
- Your numbers looked fine before the upgrade and look wrong after
What's usually causing it
- Pixels lived in checkout.liquid or Additional scriptsThose locations are going away. Any tag pasted there stops running on the new checkout unless it is migrated to a web pixel or the new extensibility model.
- Custom checkout scripts were not portedUpsells, address validation, and analytics snippets built for the old checkout do not carry over automatically.
- No server-side events as a backupWhen the browser tag breaks, nothing catches the conversion server side, so the data simply disappears.
- The migration was marked done before tracking was verifiedThe checkout can look fine to a shopper while the purchase event fails to fire.
How Mimetic finds it and ships the fix
Mimetic completes a real purchase on your migrated checkout and verifies which events still fire, so you find the breakage before your ad platforms do.
- We run a live purchase through your new checkout on desktop, mobile, and in-app browsers
- We check whether each GA4, Meta, and Google Ads event still fires, and with the right values
- We flag the tags and scripts that did not survive the migration
- We open the fix as a pull request so the broken events are restored, browser and server side
A migrated checkout can complete orders normally while the purchase event fails to fire, so the only way to know is to run the path and watch the events.
Questions
Will moving to checkout extensibility break my pixels?
It can. Pixels and scripts that lived in checkout.liquid or the Additional scripts field do not carry over automatically. They need to be migrated to a web pixel or the extensibility model, and if they are not, the events stop firing. Mimetic verifies which ones survived.
How do I know what broke after the migration?
Run a real purchase and watch the events. Mimetic completes the buying path on your new checkout and reports which GA4, Meta, and Google Ads events still fire and which went missing, so you are not guessing.
Do I have to upgrade?
Yes. Shopify is deprecating checkout.liquid, so the migration is required. The risk is not the upgrade itself, it is the tracking and scripts that stop working in the move without an obvious error. Verifying them after you upgrade is the safe step.