Shopify releases a major "Edition" update twice a year — and the Winter '26 Edition is arguably their most impactful release since Online Store 2.0. With 150+ individual updates spanning checkout, AI, B2B, developer tools, and international commerce, knowing where to focus your attention is the real challenge. This guide cuts through the noise and tells you exactly what matters, why it matters, and what to do about it.
The Big Picture: What Shopify Is Focusing On
The Winter '26 Edition reveals Shopify's strategic priorities clearly:
- AI everywhere — AI is being embedded into every major workflow, not just content creation
- Checkout is a product — Shopify is treating checkout as a competitive differentiator, not just infrastructure
- B2B is a first-class citizen — Wholesale and B2B features are now sophisticated enough to replace dedicated platforms
- Developer experience — Hydrogen, Functions, and the Admin API are getting significant improvements to reduce development time
Checkout & Payments: The Biggest Changes
Checkout Extensibility v2
This is the headline feature of Winter '26 for Shopify Plus merchants. Checkout Extensibility v2 introduces:
- New UI component library — More native-looking components that match Shopify's checkout design system, improving trust and reducing friction
- Multi-step extension support — Extensions can now span multiple checkout steps, enabling more sophisticated flows (e.g., gift message → personalisation → upsell)
- Real-time inventory checking — Extensions can query live inventory data without leaving the checkout page
- Improved performance — Extension load times reduced by ~40% in benchmark testing
If you're still using the legacy checkout.liquid file, Shopify has confirmed this will be deprecated. Migration to Checkout Extensibility is now urgent, not optional.
Shop Pay Enhancements
Shop Pay continues to be Shopify's highest-converting payment option (typically converting 1.5–2× better than guest checkout). Winter '26 adds:
- Expanded BNPL integration with more providers across more markets
- Biometric authentication improvements for faster returning-customer checkout
- Shop Pay Installments now available in additional countries
- Improved post-purchase page customisation for upsells
AI & Automation: What's New
Sidekick Agent Mode
The most exciting AI update in Winter '26. Sidekick can now execute multi-step, autonomous tasks without requiring human input at each step. Tell Sidekick: "Find all products with fewer than 5 reviews, draft review request emails for recent purchasers of those products, and schedule them to send next Tuesday morning." Sidekick executes the entire sequence.
This is the beginning of truly autonomous commerce operations, and it's significant.
Magic Email Sequences
Shopify Magic can now generate complete email sequences (not just single emails) from a single prompt. Specify the goal ("Re-engage dormant customers over 4 emails"), the tone, and the offer, and Magic produces a complete sequence with optimised send timing suggestions.
AI-Powered Inventory Forecasting
New predictive inventory features use your sales history, seasonal patterns, and external signals (like upcoming holidays or your marketing calendar) to forecast demand and suggest reorder quantities. Especially valuable for brands with long lead times from overseas suppliers.
B2B & Wholesale: Now Enterprise-Grade
B2B Catalogs 2.0
Winter '26 completely rebuilds B2B Catalogs with:
- Percentage-based and fixed-amount pricing rules at the catalog, collection, and product level simultaneously
- Customer-specific catalogs — assign different catalogs to different buyers based on account, location, or contract terms
- Catalog scheduling — price changes go live automatically at a set time, perfect for seasonal B2B promotions
- Metafield-enriched catalogs — include wholesale-specific fields (minimum order quantities, case sizes, lead times) visible only to B2B buyers
Net Payment Terms Improvements
Net 30, 60, and 90 payment terms are now available on more Shopify Plus plans, with improved dunning management and automated payment reminders built in.
Developer Tools: Faster, More Powerful
Shopify Functions Expanded
Shopify Functions — the WebAssembly-based extension system that replaced legacy Shopify Scripts — now supports:
- Order routing functions — Customise which fulfilment location processes each order based on any logic you define
- Payment customisation improvements — More granular control over showing/hiding payment methods based on cart contents, customer data, or shipping address
- Faster execution limits — 5ms execution budget (up from 2ms) for more complex discount logic
Admin API v2026-01
The January 2026 Admin API version introduces bulk query improvements, new metaobject capabilities, and significantly improved GraphQL schema documentation. Developers building on the Shopify API will spend less time debugging and more time building.
International Commerce: Shopify Markets Pro
Shopify Markets Pro — the fully-managed international commerce solution — expands in Winter '26 to cover 150+ countries with:
- Automatic duties and taxes calculation at checkout
- Local payment methods (iDEAL in Netherlands, Klarna in Germany, Afterpay in Australia, etc.) enabled automatically
- Currency conversion with transparent rate display
- Localised product content management from a single admin
What to Implement First: A Priority List
With 150+ updates, prioritisation is essential. Here's what Worldhook recommends for most merchants:
| Priority | Feature | Who It's For |
|---|---|---|
| ???? Critical | Migrate from checkout.liquid to Checkout Extensibility | All Shopify Plus merchants |
| ???? Critical | Set up Sidekick Agent Mode automations | All merchants |
| ???? High | Implement AI Inventory Forecasting | Merchants with £500K+ GMV |
| ???? High | B2B Catalogs 2.0 setup | Wholesale/B2B merchants |
| ???? Medium | Shopify Markets Pro activation | Brands selling internationally |
| ???? Medium | Checkout Extensibility upsell extensions | Merchants wanting post-purchase upsells |
Need expert help implementing Winter '26 features in your store? Worldhook's Shopify Plus team specialises in Checkout Extensibility, B2B setup, and Shopify Functions. Book a free strategy session.
Frequently Asked Questions
When does checkout.liquid get deprecated?
Shopify has set a hard deprecation deadline. All Shopify Plus merchants must migrate to Checkout Extensibility. If you haven't started, treat this as a critical project — the migration typically takes 2–6 weeks depending on your current checkout customisations.
Is Shopify Markets Pro worth it?
For brands with meaningful international traffic (10%+ of revenue from outside your home market), yes — the automatic compliance, localised payments, and duties calculation typically pay for themselves within 90 days through improved international conversion rates.