ACP Development Patterns

Before writing code

Fetch live docs:

• Checkout spec: Fetch https://developers.openai.com/commerce/specs/checkout/ for error codes and idempotency rules
• Production guide: Fetch https://developers.openai.com/commerce/guides/production/ for operational requirements
• Stripe integration: Web-search site:docs.stripe.com agentic-commerce for PSP-side patterns
• Changelog: Web-search site:github.com agentic-commerce-protocol CHANGELOG for latest changes

Pattern: Idempotency

Every POST request MUST include Idempotency-Key (UUID v4, max 255 chars).