On June 30, 2026, Shopify Scripts stop running. If you are a Plus brand adjusting payment, shipping, or line item logic through Scripts, after that date your running Scripts are gone. Editing them already stopped on April 15. This is not a matter of weeks anymore, it is days. This post explains why the forced Functions migration is the right moment to untangle your entire customizing architecture once, instead of just swapping Script for Function.

What happens on June 30

Shopify has set the deprecation clearly. Since April 15, 2026, Scripts can no longer be edited or published. Existing Scripts keep running until June 30, 2026, after which they stop executing (shopify.dev/changelog). The deadline originally set for August 2025 was pushed to June 2026 once. Shopify has been explicit that it will not move again.

Every Plus brand with active Scripts in the Script Editor is affected: discount logic, shipping rules, payment method sorting, bundle pricing. The official successor is Shopify Functions plus Checkout Extensibility. The migration is mandatory, not optional.

Why most teams scope the migration too narrowly

The obvious response is a one to one port: every Script becomes a Function, everything else stays as it is. That closes the deadline, but it leaves the real question untouched.

Most Plus brands have built up a customizing web over the years, made of three layers that nobody fully oversees anymore:

1. Liquid theme adjustments for presentation and page logic
2. Scripts for checkout rules (the ones dying now)
3. Checkout apps and app blocks for everything theme and Script could not do

These three layers interlock, often with duplicated logic. A shipping rule sits half in a Script, half in an app. A discount mechanic is hardcoded in Liquid even though a Script exists for it. The Functions migration forces you to touch at least one of these layers. That is the moment to sort out the other two as well, instead of dragging the web into a new generation.

The real bottleneck is the frontend

Here is the point most migration guides miss. Shopify Functions solve the checkout backend cleanly. They do not solve the reason Plus brands experience their frontend as a brake.

The frontend of a grown Shopify Plus storefront exists in two practical states, both with lock-in:

• Liquid theme: a page builder stack patched through app blocks and custom code. Performance depends on theme and app maintenance, marketing waits on theme PR reviews, accessibility is fragmented.
• Hydrogen plus Oxygen: a modern React stack, but the frontend has to be fully decoupled. Oxygen brings a 50ms CPU budget per worker, no WebSockets, GitHub-only CI/CD. Checkout still runs through Shopify payment fees.

Both paths tie you to Shopify-specific frontend infrastructure. If you only lift Scripts to Functions now and defer the frontend question, you close one construction site and leave the bigger one open.

The third option: Functions in the backend, frontend as its own layer

There is a path that addresses both problems in one move. You migrate the checkout logic to Shopify Functions, where it belongs, and decouple the frontend into its own management layer at the same time. Shopify stays the backend and commerce engine, the Storefront API (GraphQL) delivers the data. The frontend becomes interchangeable.

This is the core thesis of the Frontend Management Platform: the layer where storefronts are composed, localized, and delivered does not belong inside each backend, it belongs in its own tier above the backend. For Shopify specifically:

• Laioutr connects to the Shopify Storefront API. Standard integration, no custom glue code.
• The checkout rules you are migrating to Functions anyway stay in Shopify. Functions is the clean place for them.
• The frontend runs as a Composable Headless Frontend on a Nuxt codebase, not as a Liquid theme and not as Hydrogen on Oxygen.
• Multi-brand and multi-locale run on one codebase instead of n parallel Shopify stores with duplicated app licenses.

The decisive point: the Functions migration and the frontend decoupling do not collide. They complement each other. Functions is the right answer for the checkout backend, a decoupled frontend the right answer for the marketing and performance bottleneck.

Migration as an architecture inventory: 4 steps

If you have to address the deadline anyway, use it as a structured inventory instead of an emergency port.

1. Map the customizing layers

List what lives where today: which logic in the Liquid theme, which in Scripts, which in checkout apps. Flag duplicated logic and dead paths. This map is the prerequisite for every clean decision.

2. Lift checkout logic to Functions

Payment, shipping, and discount logic belong in Shopify Functions. This is the mandatory part with the deadline. Keep the Functions lean and well documented instead of carrying over the old Script complexity one to one.

3. Separate frontend logic from checkout

Everything that concerns presentation, page composition, personalization, and marketing content does not belong in Functions and not in app block sprawl. That is frontend responsibility. This is where it is decided whether you stay tied to Liquid or Hydrogen, or decouple the layer.

4. Evaluate the decoupling path

Check whether a dedicated frontend layer above the Storefront API is viable for you. The question is not academic: it decides whether your next replatforming discussion in 24 months becomes an 18-month greenfield project or a frontend refactor with the backend running.

What you gain

FAQ

Do I have to decouple the frontend before June 30?

No. The hard deadline only affects Scripts. Functions is the mandatory part. The frontend decoupling is the strategic option the inventory opens up for you, not something to force under time pressure. But the customizing map is on the table right now anyway.

Do I lose Shopify as a backend if I decouple the frontend?

No. Shopify stays the commerce engine and checkout backend. The Functions you are migrating now keep running in Shopify. Only the frontend layer above the Storefront API gets decoupled.

What happens to my Shopify checkout?

It stays. Shopify checkout keeps running by default, including the migrated Functions. A headless checkout is optional for B2B or multi-step flows, not a prerequisite.

Next steps

If you are tackling the Functions deadline anyway and want to see how a decoupled frontend layer over your Shopify Storefront API looks in practice: book a demo. We show you on a real setup how the backend stays with Shopify and the frontend is back in your hands.

More from the Laioutr platform

• Headless Frontend for Shopify
• Composable Headless Frontend
• Performance and Core Web Vitals
• Agentic Frontend Management Platform

Related reading: Magento 2.4.x End-of-Life Calendar: Versions & Dates and SAP Accelerator End of Life: Migrating to a Composable Frontend Without Replatforming the Backend.