October 12, 2026 Shopify Shopify Checkout Extensibility gives merchants a way to customise the checkout experience using supported apps, extension points, branding tools and business logic instead of relying on the oldercheckout. For Australian ecommerce businesses, understanding these options is important when planning a checkout upgrade, adding custom functionality or improving the customer journey. A checkout that works well should make it easy for customers to understand their order, choose an appropriate delivery option, complete payment and feel confident about their purchase. A fashion retailer may need gift-related functionality, while a business selling bulky products may need more specific delivery rules. A growing brand may also need better integration between checkout, inventory, accounting and analytics systems.