ACP Checkout — REST Binding

Before writing code

Fetch live docs:

1. Fetch https://developers.openai.com/commerce/specs/checkout/ for the canonical checkout specification
2. Web-search site:github.com agentic-commerce-protocol spec openapi checkout for the latest OpenAPI YAML
3. Fetch https://developers.openai.com/commerce/guides/key-concepts/ for data model details
4. Web-search site:docs.stripe.com agentic-commerce protocol specification for Stripe's merchant-side reference

Conceptual Architecture

Five Checkout Operations