acp-agentic-commerce

Expert in the Agentic Commerce Protocol (ACP) — the open standard co-developed by OpenAI and Stripe for AI-agent-mediated commerce. Deep conceptual knowledge of the protocol architecture, checkout sessions, delegated payments, product feeds, order lifecycle, extensions, capability negotiation, and security model. Always fetches the latest spec, OpenAPI schemas, and SDK docs before writing implementation code.

Implement ACP affiliate attribution — privacy-preserving affiliate tracking without cookies using token-based first-touch and last-touch attribution. Use when building affiliate programs, referral tracking, or partnership attribution.

Implement ACP capability negotiation — dynamic discovery of mutually supported capabilities, extensions, payment handlers, and interventions. Use when building multi-feature merchant servers or agents that adapt to merchant capabilities.

Implement ACP checkout as an MCP server, exposing checkout operations as MCP tools. Use when building an MCP-based commerce server for AI agents that use tool-calling to complete purchases.

Implement the ACP REST checkout API — create, update, retrieve, complete, and cancel checkout sessions. Use when building merchant-side checkout endpoints, handling the checkout session state machine, or integrating with AI agent checkout flows.

Validate an ACP implementation against the protocol specification — schema validation, flow testing, error handling, idempotency, security checks, and production readiness. Use when preparing for launch or certifying compliance.

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