Best practices for extending Shopify checkout

To optimize your app development experience, Shopify has established a set of best practices that you can refer to when developing an app that extends checkout.

Best practices

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Consider the following best practices to keep stores fast, accessible, responsive, and adaptive to all markets.

Localizing checkout UI extensions

Learn about localizing your checkout UI extension for international merchants and customers.

Testing checkout UI extensions

Learn about how you can test your checkout UI extensions to recreate merchant and customer experiences.

Checkout UX guidelines

Learn how to improve the quality of checkout experiences by following our UX guidelines for checkout.

Next steps

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For general best practices for developing apps, refer to Best practices for building Shopify apps.
For practical guidance on how to design a user interface for the Shopify admin, refer to Shopify's App Design Guidelines.
Get familiar with Polaris accessibility and content guidelines.