ACP — Agentic Commerce Protocol

OpenAI & Stripe's commerce checkout protocol with Ed25519 / ES256 signed requests.

OpenAI & Stripe's commerce checkout protocol. A merchant exposes a product feed, a checkout endpoint, and a webhook URL; agents discover the products and trigger Stripe-backed checkout sessions on the merchant's behalf.

Ed25519 / ES256 signed checkout requests (detached JSON signature): AstraSync verifies the signature, resolves the agent identity, and applies endpoint policy.

You declare: merchant ID, checkout endpoint, product feed URL, webhook URL, supported payment methods (card / Apple Pay / Google Pay / Stripe Link / bank transfer), fulfillment options.

PDLSS pre-fill: purpose financial_transaction, checkout domain + merchant:<id> added to counterparties.

{
  "protocols": ["a2a", "acp"],
  "acp": {
    "merchantId": "merchant_abc123",
    "checkoutEndpoint": "https://api.shop.com/checkout",
    "productFeedUrl": "https://api.shop.com/feed",
    "webhookUrl": "https://api.shop.com/webhooks/orders",
    "supportedPaymentMethods": ["card", "apple_pay"],
    "fulfillmentOptions": ["shipping", "digital_delivery"]
  }
}