ACP Delegated Payment & SharedPaymentToken

Before writing code

Fetch live docs:

1. Fetch https://developers.openai.com/commerce/specs/payment/ for the delegated payment specification
2. Fetch https://docs.stripe.com/agentic-commerce/concepts/shared-payment-tokens for SPT implementation details
3. Web-search site:docs.stripe.com agentic-commerce delegate payment for Stripe integration guide
4. Web-search site:github.com agentic-commerce-protocol spec openapi delegate for the delegate payment OpenAPI spec

Conceptual Architecture

What Delegated Payment Solves

The agent facilitates purchases but must never see raw card data. Delegated payment creates a secure intermediary:

• Buyer's payment credentials go to the PSP (Stripe), not the agent or merchant
• PSP returns a single-use, scoped token (SPT)
• Agent passes the SPT to the merchant in the complete call
• Merchant charges via PSP using the SPT