Step 8 — ACP, AP2, MPP

Advanced Agentic Commerce: Ship the Full Agent Surface — lesson 10 of 20 (DEFINITION)

Three commerce surfaces: /.well-known/acp.json (protocol, api_base_url, transports, and capabilities.services as a flat ID array), the AP2 extension declared on the A2A card, and MPP x-payment-info metadata inside your OpenAPI document. Each is a different buyer’s preferred rail.

Source: Agentic Commerce Protocol

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