Protocol
ACP
Agentic Commerce Protocol
The checkout session’s id is the ATR hash, with the link to the ATR in the session’s metadata. Source: lcp docs: agentic checkouts (opens in a new tab)
ACP, the Agentic Commerce Protocol, is maintained by OpenAI and Stripe. Source: ACP repository (opens in a new tab) Integra is not affiliated; we read their published interfaces.
What it is
In the Agentic Commerce Protocol, the seller creates a checkout session and the buyer’s agent completes it with a payment handler; a payment service provider moves the money. Source: lcp docs: agentic checkouts (opens in a new tab)
Where the ATR hash rides
The checkout session is named by the ATR hash, with a link to the ATR beside it.
What a payment through it proves
Each pairing’s record states what a payment through it shows, and what it does not, in the package’s own words. These are read from the package when the site is built. Source: lcp docs: pairings reference (opens in a new tab)
Of these 2 pairings, 0 have the buyer’s signature cover the ATR hash, 0 leave a public proof of it, and 0 let anyone read it back from the chain alone. Source: lcp docs: pairings reference (opens in a new tab)
Switch to Technical to see each pairing, and the sentence its record states about what a payment through it proves.
The rails it settles on
A checkout through this protocol is paid by the provider the checkout names, so it lists no rail of its own.