Shopify Checkout Extensibility
Shopify's framework for customizing checkout with app-based extensions rather than custom checkout code, relevant to how agentic and one-click purchase flows get built.
What it means
Checkout extensibility replaced older checkout.liquid customization with a structured extension system, apps add functionality, upsells, custom fields, payment options, through defined extension points rather than arbitrary code injection. This matters for agentic commerce because it constrains how purchase flows can be modified, any agent-facing or streamlined checkout experience for AI-driven purchases needs to work within this extension framework rather than bypassing it.
Why it matters for Shopify
Shopify merchants building agent-ready or streamlined checkout experiences need to work within checkout extensibility's app-based model, not legacy custom checkout code, which Shopify no longer supports for new stores.