Implement Shopify's one-page checkout branded experience with checkout UI extensions that render in multiple targets on a single page
domain: shopify.dev · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Ensure the store has the one-page checkout experience enabled in the Shopify admin checkout settings; note that the one-page layout changes which targets are visible simultaneously compared to the multi-step layout
Audit your existing checkout UI extensions to identify any that rely on the step-based navigation flow (for example, extensions that only render on the shipping step); update their target configuration if needed
For extensions targeting purchase.checkout.block.render, verify that the block position makes sense in the single-column one-page layout; adjust the placement slot in the checkout editor to an appropriate position
Test extension rendering thoroughly in the checkout editor one-page preview mode before publishing; extension components that worked in multi-step may need layout adjustments using the Stack or InlineLayout components for the one-page context
Use the useExtensionCapability hook to detect whether the extension is running in a one-page or multi-page checkout and conditionally adjust rendering if the extension must support both layouts
Review Shopify's extension component constraints for the one-page layout; certain component types or nesting depths may be restricted in the denser one-page layout
Known gotchas
Not all checkout UI extension targets are available in one-page checkout; some step-specific static targets such as shipping-step-specific targets may not render or may appear at a different point in the one-page flow
The one-page checkout is only available on stores using Shopify's new checkout; legacy checkout (Shopify Plus script-based customizations) is incompatible with one-page checkout and checkout UI extensions simultaneously
Extensions that measure or depend on the visible viewport height or page scroll position will behave differently in one-page checkout where the entire checkout is visible without scrolling between steps
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