--- title: "Glossary of agent payment terms | Agent Ready Checkout" description: "42 terms for agent checkout, defined plainly with a sourced example: mandate, TAP, x402, shared payment token, dispute condition 10.4, merchant of record." canonical: https://agentreadycheckout.com/glossary site: "Agent Ready Checkout" last_updated: 2026-11-04 section: "Glossary" --- # Glossary of agent payment terms | Agent Ready Checkout > 42 terms for agent checkout, defined plainly with a sourced example: mandate, TAP, x402, shared payment token, dispute condition 10.4, merchant of record. Source: https://agentreadycheckout.com/glossary Site: Agent Ready Checkout Last reviewed: 2026-11-04 # Glossary of agent payment terms In short 42 terms from the payments and agent-protocol vocabulary, from agentic token and mandate to dispute condition 10.4 and merchant of record. Each term has a plain definition, a sourced example and the profiles and guides where it appears. 36 of them appear in sourced facts on profile and guide pages. ## All terms [/.well-known/ucp](https://agentreadycheckout.com/glossary/well-known-ucp) The path where a business publishes its UCP profile listing services, capabilities and payment handlers. [Agent Pay for Machines (AP4M)](https://agentreadycheckout.com/glossary/agent-pay-for-machines-ap4m) Mastercard's service for machine-to-machine purchases of digital services, built on x402 and settling across cards, accounts and stablecoins. [Agent Payments Protocol (AP2)](https://agentreadycheckout.com/glossary/agent-payments-protocol-ap2) A protocol of signed mandates that record what a user authorised an agent to buy and pay, now standardised in FIDO Alliance working groups. [Agent profile](https://agentreadycheckout.com/glossary/agent-profile) A JSON document an agent hosts at a well-known URL and references on each UCP request, used by Shopify to verify agents and set access. [Agent Purchase Protection](https://agentreadycheckout.com/glossary/agent-purchase-protection) American Express's announced protection for eligible Card Members against charges caused by agent error when the agent sent authenticated intent. [Agent Terms (Amazon)](https://agentreadycheckout.com/glossary/agent-terms-amazon) Amazon's Conditions of Use section requiring agents to identify themselves and forbidding human mimicry and CAPTCHA solving. [Agentic commerce](https://agentreadycheckout.com/glossary/agentic-commerce) Buying and selling where a software agent acting for a person or business searches, selects and pays, with the person approving by instruction or per purchase. [Agentic Commerce Protocol (ACP)](https://agentreadycheckout.com/glossary/agentic-commerce-protocol-acp) An Apache 2.0 protocol, maintained by OpenAI, Stripe and Meta, for checkout sessions, delegated payment tokens and product feeds between agents and merchants. [Agentic Payment Enabler](https://agentreadycheckout.com/glossary/agentic-payment-enabler) Visa term for an entity connected to Visa that lets Agentic Payment Providers participate and initiate Agentic Transactions without engaging cardholders itself. [Agentic Payment Provider](https://agentreadycheckout.com/glossary/agentic-payment-provider) Visa term for an application that searches, discovers and buys for a cardholder on a payment instruction, stores and passes a token, and is not involved in authorisation or settlement. [Agentic Repeated Transaction](https://agentreadycheckout.com/glossary/agentic-repeated-transaction) Visa term for a series of future agent purchases the cardholder consented to, continuing until changed, cancelled or expired. [Agentic Storefronts](https://agentreadycheckout.com/glossary/agentic-storefronts) Shopify's Admin setting that syndicates a store to ChatGPT, Copilot, Google AI Mode and Gemini with the merchant as merchant of record. [Agentic token](https://agentreadycheckout.com/glossary/agentic-token) A network token issued for a specific registered agent, carrying controls and making each agent transaction traceable. [Agentic Transaction](https://agentreadycheckout.com/glossary/agentic-transaction) Visa term for an e-commerce transaction by an Agentic Payment Provider on cardholder-defined instructions, completed without direct cardholder-merchant interaction. [Amex ACE](https://agentreadycheckout.com/glossary/amex-ace) American Express Agentic Commerce Experiences: a developer kit for agent registration, account enablement, intent, payment credentials and cart context. [Buy for Me](https://agentreadycheckout.com/glossary/buy-for-me) Amazon's agent feature that buys from other brands' websites for an Amazon customer, passing encrypted details to the brand checkout. [Cardholder-defined payment instruction](https://agentreadycheckout.com/glossary/cardholder-defined-payment-instruction) The criteria a cardholder gives an agent for searching and buying, which the agent must follow and which carries a stated expiry date under Visa rules. [Delegated payment](https://agentreadycheckout.com/glossary/delegated-payment) An ACP pattern in which the agent platform passes payment data to the merchant's PSP and receives a merchant-scoped token instead of raw card data. [Dispute Condition 10.4](https://agentreadycheckout.com/glossary/dispute-condition-10-4) Visa's fraud dispute condition for card-absent transactions, where agent purchases land; merchants can defeat it with matching data from prior undisputed orders. [Dynamic Token Verification Code](https://agentreadycheckout.com/glossary/dynamic-token-verification-code) Mastercard's agentic token formatted for standard card fields, so a verified agent can pay through an existing checkout form. [Facilitator](https://agentreadycheckout.com/glossary/facilitator) In x402, a service that verifies a payment payload and settles it onchain for the server. [HTTP 402 Payment Required](https://agentreadycheckout.com/glossary/http-402-payment-required) An HTTP status code reserved for payment; x402 and MPP use it to tell a client that a resource has a price. [HTTP Message Signatures](https://agentreadycheckout.com/glossary/http-message-signatures) RFC 9421: a way to sign selected HTTP components, carried in Signature-Input and Signature headers. [Human not present](https://agentreadycheckout.com/glossary/human-not-present) An agent payment completed without the user present at the moment of purchase, on instructions the user approved earlier. [Instant Checkout](https://agentreadycheckout.com/glossary/instant-checkout) OpenAI's in-chat purchase feature in ChatGPT, launched 29 Sep 2025 on ACP and replaced on 24 Mar 2026 by merchant-site checkout. [Intelligent Commerce Connect](https://agentreadycheckout.com/glossary/intelligent-commerce-connect) Visa's single acceptance integration for agent-initiated payments over TAP, MPP, ACP and UCP, in pilot since April 2026. [Know Your Agent (KYA)](https://agentreadycheckout.com/glossary/know-your-agent-kya) Verification of an AI agent's identity and operator before it may transact, by analogy with Know Your Customer. [Link Agent Wallet](https://agentreadycheckout.com/glossary/link-agent-wallet) Stripe Link's agent interface: the agent creates a spend request, the user approves, and Link returns a one-time credential. [Machine Payments Protocol (MPP)](https://agentreadycheckout.com/glossary/machine-payments-protocol-mpp) An HTTP 402 protocol co-authored by Tempo and Stripe with one-time, session and subscription intents across stablecoins, cards and Lightning. [Mandate](https://agentreadycheckout.com/glossary/mandate) In AP2, a signed verifiable credential that records a user's authorisation; v0.2 uses a Checkout Mandate and a Payment Mandate, each open or closed. [Mastercard Agent Pay](https://agentreadycheckout.com/glossary/mastercard-agent-pay) Mastercard's agentic payments program built on registered agents and agentic tokens, with an acceptance framework for merchants. [Merchant of record](https://agentreadycheckout.com/glossary/merchant-of-record) The party that sells to the buyer, appears on the statement, and carries refunds, tax and chargebacks; in current agent protocols this stays the merchant. [Payment handler](https://agentreadycheckout.com/glossary/payment-handler) In UCP, a named entry in the payment\_handlers registry that tells the platform how to collect and pass payment for that business. [Probability score (agent)](https://agentreadycheckout.com/glossary/probability-score-agent) Mastercard's score of the likelihood that a transaction was initiated by an AI agent, given to issuers for authorisation decisions. [SD-JWT](https://agentreadycheckout.com/glossary/sd-jwt) Selective Disclosure JSON Web Token: a signed token where the holder reveals only chosen claims to each verifier. [Shared Payment Token (SPT)](https://agentreadycheckout.com/glossary/shared-payment-token-spt) A Stripe token that grants a seller a scoped right to charge a buyer's payment method, with a currency, maximum amount and expiry. [Trusted Agent Protocol (TAP)](https://agentreadycheckout.com/glossary/trusted-agent-protocol-tap) Visa's scheme for agents to sign requests with HTTP Message Signatures so merchants can verify the agent and receive consented identifiers. [Universal Commerce Protocol (UCP)](https://agentreadycheckout.com/glossary/universal-commerce-protocol-ucp) An Apache 2.0 protocol for discovery, carts, checkout, identity linking and orders between platforms and businesses, governed by a Tech Council led by Google and Shopify. [Verifiable Intent](https://agentreadycheckout.com/glossary/verifiable-intent) An open SD-JWT credential format, draft v0.1, chaining credential provider, user and agent and binding purchase constraints. [Visa Intelligent Commerce](https://agentreadycheckout.com/glossary/visa-intelligent-commerce) Visa's program for agent payments with tokenised credentials, payment instructions and rules for agentic providers. [Web Bot Auth](https://agentreadycheckout.com/glossary/web-bot-auth) An IETF draft for bots and agents to sign HTTP requests with HTTP Message Signatures and a published key, used as the identity layer by TAP and Agent Pay. [x402](https://agentreadycheckout.com/glossary/x402) An HTTP 402 payment protocol in which a server states its price, the client pays (usually in stablecoins) and retries; governed by the x402 Foundation. ## Sources 1. [UCP specification overview](https://ucp.dev/latest/specification/overview/), read 4 Nov 2026 2. [Watch Mastercard Agent Pay for Machines in action](https://www.mastercard.com/global/en/news-and-trends/press/2026/october/Mastercard-Agent-Pay-for-Machines-in-action.html), read 4 Nov 2026 3. [Google donates AP2 to FIDO Alliance](https://fidoalliance.org/google-donates-agent-payments-protocol-to-fido-alliance/), read 4 Nov 2026 4. [shopify.com/news/spring-26-edition-dev](https://shopify.com/news/spring-26-edition-dev), read 4 Nov 2026 5. [Amex Agentic Commerce Experiences](https://www.americanexpress.com/en-us/company/agentic-commerce/), read 4 Nov 2026 6. [Amazon Conditions of Use](https://www.amazon.com/gp/help/customer/display.html?nodeId=508088), read 4 Nov 2026 7. [Stripe helps Muse shop across the internet with Link](https://stripe.com/newsroom/news/stripe-helps-meta-muse-shop-with-link), read 4 Nov 2026 8. [ACP changelog 2026-04-17](https://github.com/agentic-commerce-protocol/agentic-commerce-protocol/blob/main/changelog/2026-04-17.md), read 4 Nov 2026 9. [Visa Core Rules and Visa Product and Service Rules, 24 October 2026](https://usa.visa.com/dam/VCOM/download/about-visa/visa-rules-public.pdf), read 4 Nov 2026 10. [shopify.com/news/agentic-commerce-momentum](https://shopify.com/news/agentic-commerce-momentum), read 4 Nov 2026 11. [Mastercard Agent Pay Acceptance Framework](https://www.mastercard.com/us/en/news-and-trends/stories/2025/agentic-commerce-framework.html), read 4 Nov 2026 12. [Amazon Buy for Me](https://www.aboutamazon.com/news/retail/amazon-shopping-app-buy-for-me-brands), read 4 Nov 2026 13. [docs.adyen.com/online-payments/agentic-commerce/agent-platform](https://docs.adyen.com/online-payments/agentic-commerce/agent-platform), read 4 Nov 2026 14. [docs.cdp.coinbase.com/x402/core-concepts/facilitator](https://docs.cdp.coinbase.com/x402/core-concepts/facilitator), read 4 Nov 2026 15. [Machine Payments Protocol](https://mpp.dev/), read 4 Nov 2026 16. [Cloudflare: Secure agentic commerce](https://blog.cloudflare.com/secure-agentic-commerce/), read 4 Nov 2026 17. [Power product discovery in ChatGPT (merchants page)](https://chatgpt.com/merchants/), read 4 Nov 2026 18. [Visa opens the door to AI-driven shopping (Intelligent Commerce Connect)](https://www.visa.co.uk/about-visa/newsroom/press-releases.3442048.html), read 4 Nov 2026 19. [Mastercard trust and intelligence services](https://www.mastercard.com/us/en/news-and-trends/press/2026/september/new-trust-and-intelligence-services.html), read 4 Nov 2026 20. [docs.stripe.com/payments/machine.md](https://docs.stripe.com/payments/machine.md), read 4 Nov 2026 21. [AP2 protocol site](https://ap2-protocol.org/), read 4 Nov 2026 22. [mastercard.com/us/en/news-and-trends/press/2025/april/mastercard-unveils-agent-pay-pioneering-agentic-payments-technolog](https://www.mastercard.com/us/en/news-and-trends/press/2025/april/mastercard-unveils-agent-pay-pioneering-agentic-payments-technology-to-power-commerce-in-the-age-of-ai.html), read 4 Nov 2026 23. [ucp.dev/](https://ucp.dev/), read 4 Nov 2026 24. [docs.stripe.com/agentic-commerce/protocols/ucp.md](https://docs.stripe.com/agentic-commerce/protocols/ucp.md), read 4 Nov 2026 25. [Verifiable Intent repository](https://github.com/agent-intent/verifiable-intent), read 4 Nov 2026 26. [stripe.com/pricing](https://stripe.com/pricing), read 4 Nov 2026 27. [Visa Introduces Trusted Agent Protocol](https://usa.visa.com/about-visa/newsroom/press-releases.releaseId.21716.html), read 4 Nov 2026 28. [Merchant Center help: UCP-powered checkout](https://support.google.com/merchants/answer/16837055), read 4 Nov 2026 29. [mastercard.com/us/en/news-and-trends/stories/2026/verifiable-intent.html](https://www.mastercard.com/us/en/news-and-trends/stories/2026/verifiable-intent.html), read 4 Nov 2026 30. [x402 Foundation operational launch](https://x402.org/linux-foundation-announces-operational-launch-of-x402-foundation-to-standardize-internet-native-payments-for-ai-agents-and-applications/), read 4 Nov 2026 Last reviewed 4 Nov 2026 ## Edition Matrix edition of 4 Nov 2026. Reviewed 4 Nov 2026, [30 sources](#sources-h). ## Method [How cells, sources and read dates are defined](https://agentreadycheckout.com/method)