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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