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.
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.
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).