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ACP is an open, draft specification for letting buyers, their AI agents, and businesses complete purchases through a standardized interaction model. It’s maintained by OpenAI and Stripe and licensed under Apache-2.0, with the goal of being easy to adopt alongside a merchant’s existing commerce stack rather than replacing it. The repository organizes the spec as human-readable RFCs plus machine-readable OpenAPI and JSON Schema definitions, along with worked examples and a changelog so integrators can track breaking changes. Practically, ACP defines three main pieces; a Product Feed for discovery, an Agentic Checkout API for stateful, in-conversation checkout, and a Delegated Payment flow so a merchant’s existing PSP securely handles payment credentials and settlement. Merchants remain the merchant-of-record—orders, fraud controls, payment authorization/capture, refunds, and post-purchase communication all stay on their systems while the agent surfaces status to the buyer.
Features
- OpenAPI-first specs with JSON Schemas and example payloads for rapid codegen and validation
- Built-in conformance test suite and mock server for Agentic Checkout and Delegated Payment
- Webhook signing + request signature verification utilities and idempotency helpers for all endpoints
- Product Feed validator and scheduled freshness checker with alerts when fields drift or inventory mismatches occur
- PSP adapter interface with reference adapters (e.g., Stripe, Adyen, Braintree) and a sandbox tokenization flow
- Merchant dashboard for observability: session timeline, webhook delivery metrics, error codes, and reconciliation tools
Project Samples
