Why This Matters Now
Shopify is phasing out legacy checkout customizations. If your store still relies on checkout.liquid, Additional Scripts, or apps that inject script tags on the Thank You and Order Status pages, you must migrate to Checkout Extensibility by August 28, 2025 (for Shopify Plus stores). Otherwise, those older methods will stop working and your tracking, upsells, and custom logic could break. Shopify+1
Quick note on timelines: Shopify split the transition into phases. The Information, Shipping, and Payment checkout steps stopped supporting
checkout.liquidin 2024; Thank You and Order Status pages (plus Additional Scripts and script-tag apps) are set to sunset on Aug 28, 2025 for Plus merchants. Some third-party sources also note Aug 26, 2026 for non-Plus stores—verify your plan and admin notices.
What Is Shopify Checkout Extensibility?
Checkout Extensibility is Shopify’s new, app-based way to customize checkout safely and upgradeably. Instead of editing theme liquid or injecting arbitrary scripts, you extend checkout using UI Extensions, Shopify Functions, Pixels, Branding, and Post-purchase extensions—without risking breakage during platform updates.
Why it’s better:
Built for speed, security, and upgrades
Compatible with Shop Pay and future checkout features
Centralized, app-driven customizations (less brittle than legacy scripts)
Who Is Affected?
Shopify Plus merchants who customized Thank You/Order Status pages with
checkout.liquid, Additional Scripts, or script-tag appsMerchants relying on legacy Shopify Scripts (discounts/shipping/payment logic) should plan migration to Shopify Functions—Shopify extended Scripts deprecation to June 30, 2026, but planning now avoids last-minute surprises.
The Deadline You Can’t Miss
Aug 28, 2025 (Shopify Plus): checkout.liquid, Additional Scripts, and apps with script tags stop working on Thank You and Order Status pages. Move those customizations to Checkout Extensibility.
- Heads-up for non-Plus: Several partners reference Aug 26, 2026 for non-Plus Thank You/Order Status upgrades; always confirm in Admin → Settings → Checkout for your store.
Identifying and addressing these issues requires a robust website testing strategy
What To Do Before August 28, 2025 (Step-by-Step)
Confirm your current setup
Go to Settings → Checkout → Configurations. If you see an upgrade notice for Thank You/Order Status, you’re on a deprecated version and need to migrate. Shopify Help CenterInventory your customizations
List everything living incheckout.liquid, Additional Scripts, or injected via script tags (e.g., analytics pixels, post-purchase surveys, upsell widgets, custom messages). Map each one to an Extensibility alternative:Tracking/analytics: move to Customer/Checkout Pixels
Discounts/shipping/payment logic: move from Scripts to Functions
UI tweaks/blocks: use Checkout UI Extensions or compatible apps Shopify
Replace incompatible apps
Check installed apps for Extensibility support. If an app only uses script tags/Additional Scripts on Thank You/Order Status, find a replacement that supports Checkout Extensibility. Shopify Help CenterRebuild your Thank You & Order Status pages
Use the new Thank You / Order Status editor and app blocks to replicate your old features (upsells, order info, social proof, feedback prompts) in a compatible way—then publish the new pages. Shopify Help CenterPlan your Scripts → Functions migration
If you still run Shopify Scripts, schedule a transition to Shopify Functions well before the 2026 cutoff so you’re not blocked by parity gaps later. Shopify ChangelogTest thoroughly before and after publishing
Validate events, conversions, UX, and edge cases (guest vs. logged-in, discounts, subscriptions, third-party payments, mobile). See testing checklist below.
Shopify’s official “Upgrade Thank You & Order Status” guide is the canonical reference for these steps. Bookmark it.
Migration Checklist
Confirm Admin notice to upgrade Thank You/Order Status
Export/backup legacy
checkout.liquidand Additional ScriptsList every script-tag app and confirm Extensibility support
Recreate tracking with Pixels; QA GA4/Meta/TT events
Rebuild custom UI with UI Extensions/app blocks
Move discounts/shipping/payment logic from Scripts → Functions
Publish new Thank You/Order Status pages
Full QA pass (mobile, cross-browser, guest/member, coupons, high-latency network)
Monitor analytics for a week and compare conversion/drop-off
Common Pitfalls (And How to Avoid Them)
Lost tracking on Thank You page: Move Additional Scripts to Pixels or compatible apps and validate events fire once and with correct parameters. Shopify Help Center
Missing UI customizations: Rebuild with UI Extensions—don’t paste scripts into random app blocks. Shopify
Discount logic not ported: If you used Shopify Scripts for complex promotions, plan adequate time to rewrite in Functions (and re-QA edge cases). Shopify Changelog
Unverified third-party apps: Replace script-tag-only apps with Extensibility-ready alternatives.
FAQs Store Owners Are Searching
What exactly is deprecating on Aug 28, 2025?
For Shopify Plus stores: checkout.liquid, Additional Scripts, and script-tag apps on Thank You and Order Status pages. Shopify+1
Do I still need to worry about scripts on the core checkout steps?
Yes—those pages already stopped supporting checkout.liquid in 2024. If you’re still relying on it, you’re overdue. Braze
What about Shopify Scripts for discounts/shipping?
Shopify extended Scripts deprecation to June 30, 2026, but you should begin moving to Shopify Functions now to avoid last-minute crunch. Shopify Changelog
Where’s the official Shopify guide?
See Shopify Help: Upgrade Thank You & Order Status and Shopify Dev Docs on apps in checkout / checkout.liquid status.
Why QA & Website Testing Matter During This Upgrade
Checkout is where revenue happens. Any migration can quietly introduce UX friction, broken events, or edge-case bugs that are hard to spot—until conversion drops.
A focused QA cycle will:
Validate UI/UX across devices (especially mobile)
Confirm analytics/pixels still fire correctly
Catch functional regressions (discounts, subscriptions, multi-currency, express pay)
Verify thank-you flows (upsells, post-purchase surveys, order updates) work as intended
If you want expert help, QAnalyz provides hands-on Shopify website testing: usability, UI/UX, functionality, responsiveness, and cross-browser validation—plus a report with annotated screenshots and prioritized fixes.
→ Get a QA quote:
→ Learn more about us:
Final Word
Treat the Aug 28, 2025 deadline as a reliability and revenue insurance moment. Migrate now, not later—then test like your conversions depend on it (because they do). If you want an experienced QA partner to pressure-test your checkout and protect your tracking, QAnalyz is here to help:
