Shopify has published migration guides for upgrading Checkout and Customer Account UI extensions to the latest API version using Polaris web components. The guides cover moving from React or JavaScript extension APIs to Preact, Polaris web components, and the global shopify object. Over 60 component-specific migration pages are included for components like Button, Checkbox, Banner, and View. Extensions using API versions earlier than 2025-10 should use these guides, as Polaris web components are the default from 2025-10 onward. Instructions for migrating checkout metafields to cart metafields are also provided.

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