Shopify App Extension Not Showing on Thank You Page After Installation

Shopify Apps

Topic summary

A developer created a Shopify App Extension that adds a custom button to the Thank You Page using the Checkout UI Extensions API. The extension worked correctly in their development store, but after building and installing it on a merchant store, the extension block doesn’t appear in the Thank You Page settings.

Key Issue:

  • Extension functions properly in development environment
  • After installation on production merchant store, no block is available to add
  • The custom button is completely missing from the Thank You Page configuration options

Status: The developer is seeking help to identify what might prevent the extension from appearing in other stores after installation. No responses or solutions have been provided yet.

Summarized with AI on November 1. AI used: claude-sonnet-4-5-20250929.
1

Hey Shopify Community,

I recently developed a Shopify App Extension that adds a custom button to the Thank You Page. It was working perfectly on my development store, but after building and installing it on a merchant store, there is no block available to add on the Thank You Page.

What I Did:- Created an App Extension using the Shopify Checkout UI Extensions API.

  • Successfully tested it on my development store—the button appeared on the Thank You Page as expected.
  • Built the app and installed it on a different Shopify store.
  • The extension does not show up in the Thank You Page settings (no block to add).

Question:

What could be causing this issue? Is there something I might be missing that prevents the extension block from appearing on the Thank You Page in other stores? Any help or insights would be greatly appreciated!

Thanks in advance! :raising_hands: