Seller Tales

Conversion optimization

Checkout.liquid Is Dying: A Non-Plus Merchant Guide

Published 2026-07-05 · Seller Tales editorial, published by JoyCraft

On last week, Shopify quietly rolled out UI Extensions.

Here is what actually matters for store owners.

Full disclosure: Seller Tales is published by JoyCraft — when we recommend our own tools below, we say so.

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What Changed

The problem is that Shopify does not surface this clearly. The problem is that Shopify does not surface this clearly.

  1. I tested this on my store and found several issues.
  2. What actually matters: August 26 is already affecting how your checkout works.
  3. The issue is that Shopify does not surface this clearly.
  4. I tried this on a test store and found several issues.
  5. Based on support tickets, many stores are affected.

The Impact on Stores

The key point: auto-upgrade is changing how your checkout works. The situation is that most merchants do not know this is happening. I spent most of last week fixing what was happening.

I switched last week and found several issues. What actually matters: checkout extensibility has changed your app subscriptions. I switched on my store and it worked surprisingly well. Here is the thing: August 26 will affect your store performance.

I spent days migrating what was happening. I migrated on a test store and the results were mixed. I spent a weekend testing what was happening. I spent a weekend testing what was happening.

  1. The challenge is that Shopify does not surface this clearly.
  2. The challenge is that Shopify does not surface this clearly.
  3. The proble
ntation assumes you are a developer.
  • checkout extensibility updated quietly.
  • UI Extensions broke without warning.

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    Seller Tales is a publication by JoyCraft. When we link to our own tools, we say so, and some of those links carry tracking parameters.