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Shopify Checkout UI Extension Development: A Step-by-Step Guide (2026)

Summary by DEV Community
Shopify checkout UI extension development means building a small, sandboxed React or Preact component that Shopify renders inside a fixed slot in checkout, such as a block on the Thank you page or a static area next to the cart line items. This guide scaffolds one from a real Shopify CLI project, reads and writes checkout data through the current shopify global object, tests it locally, and deploys it under the platform's actual constraints. By …
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DEV Community broke the news on Tuesday, July 21, 2026.
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