Shopify Scripts Deprecation: Plus Migration Checklist

Shopify Scripts Deprecation: The Migration Checklist for Plus Merchants Before June 30

If you run a Shopify Plus store and Scripts still power any of your discounting, shipping, or payment logic, this is the page to work through. Two dates matter: April 15, 2026, when Shopify disables the ability to create or edit existing Scripts, and June 30, 2026, when Scripts stop executing entirely. After April 15 there is no way to patch a broken promotion or fix a buggy shipping rule in your legacy code — whatever ships before that lockout is what you live with for the final ten weeks.

This guide is a checklist, not an explainer. It walks through the inventory, rebuild, and cutover steps your team needs to complete before April. If you want the technical background on the replacement system — Wasm runtime, language support, the seven Function types — read the companion piece, Shopify Functions Explained. This article assumes you already know you have to migrate and just need the order of operations.

The Technical Infrastructure Shift

For over a decade, Shopify Scripts allowed Plus merchants to write custom Ruby code that ran on Shopify’s servers during the checkout process. While powerful, Scripts were inherently tied to the legacy checkout.liquid file. Because Shopify is moving toward a more secure, performant, and upgradeable checkout, they are replacing these server-side scripts with Shopify Functions and the Discounts API.

Shopify Functions are built on WebAssembly (WASM). Unlike the legacy Scripts, which required a specialized Ruby environment, Functions are distributed as apps. This shift allows for greater reliability, faster execution times, and better integration with the Shopify admin. However, it also requires a fundamental rewrite of every line of custom logic your store currently utilizes.

The Risks of Inaction

Waiting until the deadline is a high-risk strategy for any high-volume merchant. If you fail to migrate by the cutoff, your store will face several immediate failures:

1. Broken Discount Logic: Complex "Buy One Get One" (BOGO) deals, tiered discounts, or bundle pricing handled by Scripts will simply stop applying, potentially costing thousands in lost conversion or margin errors.
2. Loss of B2B Pricing: Many Plus merchants use Scripts to hide or show specific prices based on customer tags. Without a replacement Function, your wholesale customers may see retail pricing or vice versa.
3. Shipping Rule Failures: Scripts that hide specific shipping carriers based on zip codes or order weight will disappear, leading to expensive shipping errors or impossible delivery promises.
4. Payment Method Exposure: If you use Scripts to hide "Cash on Delivery" or specific credit card processors for certain orders, those restrictions will vanish on July 1.

Step 1: The Comprehensive Script Audit

The first step in any migration is a full inventory of your current Ruby scripts. Many stores have "ghost scripts"—code that was written years ago for a specific campaign that is still active but doing nothing.

Audit your Scripts editor and categorize every active script into three buckets:

• Line Item Scripts: These usually handle discounts.
• Shipping Scripts: These handle carrier rates and visibility.
• Payment Scripts: These handle the visibility of payment gateways.

For each script, document the business logic it fulfills. Do not look at the code yet; look at the outcome. For example: "If the cart contains SKU-A, give 50% off SKU-B."

Step 2: Mapping to Shopify Functions

Once you have your list of requirements, you must map them to the new technical equivalent. Most Shopify Scripts will be replaced by Shopify Functions documentation.

• Product Discounts: Previously handled by Line Item scripts, these are now handled by the Product Discount API within Functions.
• Order Discounts: These can often be handled via the native Shopify Discount UI now, or through an Order Discount Function.
• Shipping Customizations: Use the Delivery Customization API. This allows you to rename, reorder, or hide shipping options.
• Payment Customizations: Use the Payment Customization API to filter or sort payment methods.

Some logic that previously required a script can now be handled by native Shopify features. For instance, Shopify’s improved native "Automatic Discounts" can now handle many simple BOGO scenarios that once required Ruby.

Step 3: Development and Testing in Draft Checkout

Unlike the old Scripts editor, which allowed for some "live" editing (often with disastrous results), Shopify Functions are deployed via apps. This requires a development workflow involving a partner or an in-house engineering team.

You must create a development store or use a sandbox environment to write the WASM-based functions. Once written, these must be tested using Shopify’s "Draft Checkout" feature. This allows you to see how the new logic interacts with your store’s specific product data and customer segments without affecting live traffic.

Testing must account for "edge cases." What happens if a customer applies a manual discount code on top of a Function-based discount? What happens if a customer is logged in as a VIP? These interactions must be documented and validated before the transition.

Step 4: Deployment and Monitoring

Deploying the new Functions is not a "flip a switch" moment. It should be treated as a staged rollout. Because Checkout Extensibility allows you to run the new checkout in parallel with the old one (for testing purposes), you can verify the logic in a real-world environment before committing to the full upgrade.

Once the Functions are live, you must monitor your conversion rates and discount application logs closely. The goal is to ensure that the transition is invisible to the customer but provides the same financial logic for the business.

The Role of Checkout Extensibility

The death of Scripts is inseparable from the death of checkout.liquid. Shopify Scripts only run on the old checkout. To use Shopify Functions, you must upgrade to Checkout Extensibility. This is a significant change in how Shopify handles the final stage of the buyer journey. It offers better performance and security, but it removes the ability to inject arbitrary JavaScript into the checkout. Everything must now be done via UI Extensions and Functions.

Frequently Asked Questions

1. Can I keep using my Ruby scripts if I stay on the legacy checkout? No. Both the legacy checkout (checkout.liquid) and Shopify Scripts are being deprecated. After June 30, 2026, the legacy checkout will no longer be available for Information, Shipping, and Payment pages, making the Scripts associated with them non-functional.

2. Is there an automated tool to convert Ruby scripts to Functions? No. Because Ruby and WebAssembly/Rust (the primary language for Functions) are fundamentally different, there is no one-to-one automated converter. Each script must be manually rewritten to fit the new API structures.

3. What happens if I miss the April 15, 2026 deadline? After April 15, you will be unable to edit your existing scripts or create new ones. If a bug is discovered or if you need to change a promotion, you will be unable to do so through the Scripts editor. You will be forced to migrate to Functions immediately to make any changes.

4. Are Shopify Functions included in my Shopify Plus subscription? Yes, Shopify Functions are a core feature of the Shopify Plus plan. However, the development costs to build, deploy, and maintain the custom apps that house these Functions are the responsibility of the merchant.

5. Can I use third-party apps instead of building custom Functions? Yes. Use the Shopify App Store to find "Discount" or "Checkout" apps that are built on Shopify Functions. In many cases, a well-supported third-party app can replace a custom script for a fraction of the development cost.

Conclusion

The sun is setting on the era of Ruby scripts in Shopify. For Plus merchants, this is not a optional upgrade; it is a mandatory architectural shift. The complexity of moving legacy logic into the WebAssembly environment of Shopify Functions requires months of planning, development, and testing. Merchants who begin their audit today will ensure a stable, profitable checkout experience through the 2026 transition. Those who wait until April 2026 risk a catastrophic failure of their most critical business rules.

The time to map your migration is now. Begin by identifying every custom discount, shipping rule, and payment restriction currently running in your store. The transition to Checkout Extensibility is the single most important technical project for Shopify Plus operators in the coming 18 months. Readying your team and your budget for this shift is the only way to protect your conversion rate and operational integrity.",body_es:

Related Shugert resources

• Shopify Functions — practical patterns — what to migrate Scripts logic into.
• Shopify Plus integration services — we run Scripts → Functions migrations end-to-end.
• Get a quote for a Scripts replacement project.

Additional reference

• Shopify Dev Docs — Functions API