Start building for checkout

To get started with Checkout UI extensions, Shopify Functions, Post-purchase extensions, or Web pixel app extensions, you can use Shopify CLI, which generates starter code for building your extension and automates common development tasks.

The following is a lightweight guide for getting started to build. You can alternatively learn how to use the GraphQL Admin API to style checkout for a brand, such as changing the colors and corner radius settings on checkout form fields.