Thank You page upsell or widget gone after August 26? What changed and the 10-minute fix

Shopify Discussion
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Starting August 26, non-Plus stores lose the legacy Thank You / Order status page customizations: the Additional Scripts box, checkout.liquid customizations, and apps that injected ScriptTags into those pages. There is already a good thread here about the tracking side (pixels going quiet with no error). This one is about the visible side: upsell offers, surveys, and widgets that simply disappear from the Thank You page.

How to tell if you are affected

  1. Place a test order on your own store.
  2. Look at the Thank You page. If the offer, survey, or widget you used to see is gone, your app either has not migrated or migrated but needs you to re-add its block.
  3. Check the app’s changelog or emails from the developer. Many apps that did migrate still require you to manually re-add their block in the new editor.

The fix (works for any app built for the new pages)

  1. Go to Settings → Checkout → Customize. This opens the checkout editor.
  2. In the page selector at the top, switch from Checkout to Thank you.
  3. Click Add app block and pick your app’s block.
  4. Position it (typically under the order confirmation) and Save.
  5. Repeat on the Order status page if the app also rendered there.

If your app does not appear in the Add app block list, it was never rebuilt for Checkout Extensibility. Waiting will not bring it back, and no setting on your side can. You will need an app that renders as a Thank You page app block.

If you end up choosing a replacement, a few things worth checking first. Before building in this space I read through 155 one-star reviews of the biggest post-purchase apps, and the same complaints repeat:

  • Percentage-of-revenue pricing: the bill grows with the app’s own measurement of what it generated.
  • Attribution you cannot verify: some apps count orders your store would have gotten anyway.
  • Billing that survives uninstall: “still being charged despite having uninstalled” comes up again and again.
  • Setup complexity: if the setup guide is a three-hour read, it is doing too much for a Thank You page.

Disclosure: I build Upright Upsell, a deliberately small flat-price app in exactly this space, so weigh my replacement advice accordingly. The fix steps above are app-agnostic and work for any migrated app.

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Good addition - worth underlining both points. ‘Supports checkout extensibility’ in an app’s changelog only means the block exists; nothing places it for you, so the page can look broken while the fix is a 30-second Add app block. And yes, the Thank you and Order status pages are configured separately in the editor - restoring one and forgetting the other is an easy way to think you’re done while half the surface is still empty.