AI shopping agents can search for products, build carts and attempt to buy on a customer’s behalf. For merchants, preparing for that possibility means solving two separate problems: exposing products and checkout functions in a way an agent can use, and verifying the agent’s identity and the customer’s authorization at the point of payment. Protocols from Google, Visa and Mastercard describe ways to address those problems, but announcements and specifications do not establish that every merchant, payment provider or shopper can use them today.
What changes when an agent tries to make a purchase?
An agent-led transaction may involve software comparing products, selecting items, assembling a cart and submitting an order for a person or business. The merchant’s existing payment processor may still handle the payment, but the merchant also needs to know what software is acting, what the customer approved and whether the final order still matches that approval.
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It helps to separate the work into two layers:
- Commerce interface: How an agent discovers products and interacts with the merchant’s cart, checkout and order-management functions.
- Payment authorization: How the parties establish that the agent may act for the customer, what limits apply and what transaction the customer approved.
These layers can work together, but they are not interchangeable. A protocol that makes checkout functions available does not, by itself, prove that a customer authorized a particular purchase.
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Google UCP and AP2
Google describes the Universal Commerce Protocol (UCP) as a way to standardize commerce interactions across consumer surfaces, businesses and payment providers, including product discovery, checkout and order management. Its Agent Payments Protocol (AP2) addresses authorization: Google’s developer guide describes typed mandates that record intent and apply transaction guardrails. In Google’s framing, UCP covers what is ordered and from whom, while AP2 covers who approved the purchase and creates an audit trail.
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Google says merchants can keep their business logic and remain Merchant of Record under UCP; it also describes an embedded checkout option for a customized experience. The design separates payment instruments from payment handlers. These are Google’s descriptions of the protocol, not a guarantee that every implementation preserves the same controls. Confirm the details with the platform and payment provider before relying on them.
Visa Trusted Agent Protocol and Intelligent Commerce Connect
Visa’s Trusted Agent Protocol (TAP) is designed to help merchants distinguish recognized shopping agents from ordinary or malicious bots. Visa’s technical material describes checking an agent signature and comparing credential hashes as possible verification steps. These signals can help identify an agent; they do not establish that fraud or disputes will disappear.
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In April 2026, Visa announced Intelligent Commerce Connect, a Visa Acceptance Platform integration for payment initiation, tokenization, spend controls and authentication. Visa said it supports agent-initiated payments through TAP, MPP, ACP and UCP. The announcement establishes Visa’s stated coverage, not availability for every merchant or provider. Confirm eligibility, supported regions and implementation requirements directly.
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Mastercard describes Agent Pay as using registered agents, network tokens and verified user intent. Its Agent Connect product description covers merchant-authorized product catalog discovery, cart orchestration and payment enablement. Those descriptions explain Mastercard’s intended controls and capabilities; merchants still need to check the current rollout, provider support and contract terms that apply to them.
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How do the announced options differ?
| Initiative | What it addresses, according to its provider | What a merchant should verify |
|---|---|---|
| Google UCP | Commerce interactions including product discovery, checkout and order management; Google says merchants retain their business logic and Merchant of Record role. | Which capabilities the implementation actually supports, how checkout is customized, and whether the promised merchant controls apply to the specific integration. |
| Google AP2 | Typed authorization mandates, guardrails and an audit trail, designed to work with UCP. | How approval is represented, enforced and recorded in the provider’s implementation, and how it connects to the merchant’s payment flow. |
| Visa TAP | Agent identity and authorization signals for agent-to-merchant communication. | How the agent is verified, which signals the integration exposes and how bot-management rules treat recognized agents. |
| Visa Intelligent Commerce Connect | Visa announced support for payment initiation, tokenization, spend controls and authentication, with TAP, MPP, ACP and UCP acceptance. | Availability, eligibility, geographic coverage, supported protocols and any commercial or technical requirements. |
| Mastercard Agent Pay | Registered agents, network tokens and verified user intent, as described by Mastercard. | Which agents and payment flows are supported, how tokens and intent work in practice, and where the product is available. |
| Mastercard Agent Connect | Merchant-authorized catalog discovery, cart orchestration and payment enablement, as described by Mastercard. | How catalog and cart access are integrated with the merchant’s platform, and what the payment and operational responsibilities are. |
This is a comparison of provider-described scope, not a neutral performance test. The initiatives are not automatically interchangeable: an integration’s protocol coverage, payment handling and merchant controls depend on the implementation and agreements involved.
What should a merchant check before enabling agent checkout?
Use these questions to evaluate a platform or payment-provider proposal. They are decision points, not a substitute for that provider’s technical documentation or contract.
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- Agent recognition: Does the integration provide verifiable agent identity, signing or verification material, and a way to associate the action with the shopper? Ask how these signals are checked and what happens when verification fails.
- Authorization scope: Which orders can proceed without a fresh customer confirmation? Define whether approval is limited by merchant, spend, item or category, shipping constraints, or duration. Google’s AP2 guide illustrates an intent mandate with allowed merchants and a spending limit, followed by a payment mandate bound to a cart and amount; its example pauses approval when a limit is exceeded. That is a protocol illustration, not a recommended spending threshold.
- Credential handling: Ask whether credentials are tokenized or otherwise protected, which party performs payment authentication, and what payment data the agent can see. Visa describes tokenization and authentication in Intelligent Commerce Connect; Mastercard describes network tokens in Agent Pay.
- Checkout and merchant control: Establish who controls checkout, pricing logic, fulfillment rules and the customer relationship, and who is Merchant of Record. Do not assume a protocol-level description guarantees a particular provider’s implementation.
- Exceptions and disputes: Map the process for a decline, changed cart, out-of-stock substitution, refund, cancellation, suspected compromised agent and customer claim. The available product descriptions do not settle legal liability or contractual risk allocation across implementations; get those answers from the relevant providers and agreements.
- Bot and site operations: Coordinate recognized shopping-agent traffic with bot management and site-protection rules. Visa identifies the difficulty of distinguishing trusted agents from ordinary or malicious bots as a motivation for TAP.
How should merchants compare implementation proposals?
Compare the proposed integration against the same practical criteria rather than relying on a protocol name or a broad capability claim:
- Coverage and interoperability: Which protocols and commerce functions are supported now, and which are only planned?
- Merchant functions: Can the integration expose the needed catalog, cart, checkout and order-management capabilities?
- Control: Who retains pricing, fulfillment, checkout and Merchant of Record responsibilities?
- Trust and payment security: How are agent identity, user intent, authentication and tokenization handled, and what evidence is available when a transaction is challenged?
- Fit with current systems: What changes are needed to the commerce platform, payment setup, fraud controls and operational workflows?
- Availability and terms: Which providers, merchants, regions and customer experiences are eligible, and what contractual terms apply?
- Exception handling: Who owns customer support and the resolution path for refunds, cancellations, altered orders and disputes?
Google describes UCP as modular, Visa lists four protocols for Intelligent Commerce Connect, and Mastercard describes Agent Connect across catalog, cart and payment. Those vendor descriptions are useful starting points for questions, not independent evidence that one option is faster, safer or more widely deployed than another.
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What do the adoption figures actually show?
Mastercard’s Agent Pay page, with figures shown for 2025, says 39% of U.S. consumers had used generative AI for online shopping and 53% planned to do so in 2025. The page’s displayed footnote markers did not make the underlying study methodology clear in the available information. These figures concern generative AI use or plans for online shopping; they should not be read as the share of consumers who completed purchases through payment-capable agents.
The same page presents a forecast that AI could handle up to 20% of e-commerce tasks in 2025. That is an expectation attributed to Mastercard, not a measured result. Neither figure establishes completed agent-payment volume, broad merchant readiness or adoption across regions. Product announcements and protocol specifications describe designs and announced capabilities; they do not establish universal availability or a universal allocation of liability.
What merchants should do next
A merchant does not need to treat every announced protocol as a mandate to rebuild checkout. A useful next step is to ask its commerce platform and payment provider for implementation-specific answers to the controls above, then compare those answers with the merchant’s own requirements for customer approval, payment security, fulfillment and dispute handling. Until those details are clear, treat agent checkout as an integration decision to evaluate—not a capability that can be assumed from a product announcement.
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