Checkout UI Extension not being launched

Topic summary

Multiple developers are experiencing an issue where their Checkout UI Extensions work correctly in development environments but fail to load in production or when installed on stores.

Key Details:

  • Extensions deploy successfully and Shopify confirms the new version is active
  • The extension targets “purchase.checkout.reductions.render-after”
  • No console logs or debugging output appears when the extension should load
  • No errors are reported in the Partner Dashboard

Affected Scenarios:

  • Production stores after deployment
  • Dev stores when the app is actually installed (vs. dev preview)
  • Custom apps on Shopify Plus stores

Status: The issue remains unresolved with no solutions proposed yet. Multiple users have confirmed experiencing the identical problem.

Summarized with AI on October 24. AI used: claude-sonnet-4-5-20250929.

Hello there,

I have a ui checkout extensibility that works fine in dev. But when I deploy it to production it’s not enabled for our customers.

The checkout uses the “purchase.checkout.reductions.render-after” target and deployment works fine. Shopify tells me that a new version with the extension is active.

However I added a console.log(“Init my app”) to the code and can’t see it on the stores.

Any ideas what’s not working here?

Thank you very much.

1 Like

Same problem, my simple Checkout UI extension-only app works in dev preview but not when actually installed to that same dev store, nor when deployed as a “custom app” to a production ShopifyPlus store.

No errors, no bad stats in the partner dashboard for the app. Just never seems to even try to load the extension (my debugging console.warn calls also never fire).

I have the same issue.

i have the same issue, it was working a month back.

Developers see the actual developer forums, search first before posting.
If posting be able to provide minimal replication steps, or request ids, etc.