Payment Technology · Industry
On 8 September 2026, at a Goldman Sachs conference, Visa's chief executive Ryan McInerney said what the payments industry had spent a year insisting was not so: 'We are seeing adoption for shopping, but not yet for autonomous payments.' Consumers use AI assistants to compare and choose, he said, and then go to the seller's website to pay. Nine months earlier Visa's own press release had promised that 'in 2026, AI agents won't just assist — they will complete your purchases', with millions of consumers buying through agents by the holiday season.
For a business owner the question is not whether agents will one day buy things. It is what has actually been switched on at your processor, what it costs, and who is left holding a chargeback when an agent buys the wrong thing. Here is the year in evidence, from the launch announcements to the retreat, with what each of the reviewed processors has said in its own name.
The first live product was Instant Checkout in ChatGPT, announced by Stripe (A) and OpenAI on 29 September 2025. US users could buy from US Etsy sellers inside the chat, with 'over a million Shopify merchants' to follow. Stripe published the plumbing as an open specification, the Agentic Commerce Protocol, and a new payment primitive, the Shared Payment Token, which 'lets applications like ChatGPT initiate a payment without exposing the buyer's payment credentials' and is 'scoped to a specific merchant and cart total'. The merchant stayed the merchant: orders 'flow from ChatGPT to a merchant's backend via ACP. Merchants can accept or decline the order, charge the payment method, calculate and remit sales tax, and handle fulfillment and returns, as they normally would.'
The price arrived in January. PYMNTS reported on 21 January 2026, citing a Shopify spokesperson's confirmation to The Information, that OpenAI would charge a 4% fee on sales made through ChatGPT checkout from 26 January, on top of the fees charged by Shopify, and that Google's AI Mode, Gemini and Microsoft's Copilot charged no additional fee for checkout sales. Shopify Payments (A-) merchants could toggle each AI platform on or off individually.
Then it was gone. Forbes, summarising The Information's reporting, dates the pullback to 4 March 2026, roughly five months after launch: instead of completing purchases inside product listings in chat, OpenAI would route transactions through retailers' own apps inside ChatGPT. An OpenAI spokesperson told Modern Retail that 'Instant Checkout is moving to Apps, where purchases can happen more seamlessly'. Shopify's president Harley Finkelstein said at an investor conference the same day that only about a dozen of Shopify's millions of merchants had actually gone live, and that the holdup was on the AI firms' side. Forbes' account of why is worth reading in full: at launch the product supported single-item purchases only, no multi-item carts, no promotional codes, no shipping promises, and, according to The Information, no system for remitting state sales tax. Shopify's replacement, announced for later in March, is 'agentic storefronts', in which the product is found in ChatGPT and the purchase is completed on the merchant's own storefront in an in-app browser or a separate tab.
That is the shape McInerney described in September: discovery in the assistant, payment on the seller's site. The 4% fee applied to the in-chat checkout; on a purchase completed on your own storefront, your ordinary processing fee applies.
Four names come up in every announcement, and it helps to know which is which.
Visa's version of the merchant-side product, Intelligent Commerce Connect, was announced on 8 April 2026 as a service on the Visa Acceptance Platform that accepts agent-initiated payments over the Trusted Agent Protocol, ACP, UCP and the Machine Payments Protocol. The named pilot partners were AWS, Highnote, Mesh, Payabli (B), Sumvin, Diddo and Aldar. On 18 December 2025 Visa said 'hundreds' of agent-initiated transactions had been completed in closed beta, for Bose headphones, jewellery and corporate bill pay. Hundreds is the figure to hold against the holiday-season prediction in the same release.
Less than the announcements imply, because most of it is not switched on. Stripe's newsroom and blog posts disclose no merchant price for agentic payments beyond saying an existing Stripe merchant can enable them in its existing integration. Shopify's ChatGPT checkout carried OpenAI's 4% on top of Shopify's fees for the five weeks it ran at that price, per The Information's reporting, and Google and Microsoft charged nothing extra. Visa's and Mastercard's releases say nothing about a merchant fee for agent-initiated transactions, and neither network's public US interchange schedule, both dated April 2026, carries an agentic category. As of September 2026 an agent-initiated card payment prices as whatever card-not-present category the card and merchant fall into.
There is one cost that does not appear on any pricing page: tokenisation. Both networks moved their tokenisation and card-updating services from per-use billing to a rate on every card-not-present authorisation in April 2026, which we covered in our piece on tokenization fees, and the credentials these protocols pay with are tokens: Shared Payment Tokens at Stripe, Google Pay credentials in UCP, and Agent Pay is an extension of Mastercard's token service by name. If agent traffic ever becomes a meaningful share of your sales, it will be tokenised traffic, priced accordingly.
This is the question a business owner should put to their processor before turning anything on, and the honest answer in September 2026 is that the rules have not been written.
What has been written is who the merchant is. Stripe's Agentic Commerce Suite announcement: 'As the merchant of record, you also retain all control over customer relationships, including how refunds and disputes are managed.' Google's UCP announcement: retailers maintain seller-of-record status. Stripe's launch release: merchants handle fulfilment and returns 'as they normally would'. Every protocol preserves the merchant of record, and the merchant of record is where a chargeback lands.
What the networks have promised is machinery, not liability rules. Mastercard's April 2025 release committed to 'a process to help clarify agentic transactions that may be unfamiliar or unrecognized' and to consumer authentication using on-device biometrics. Visa's Trusted Agent Protocol gives you a way to recognise an agent before it buys. EMVCo, the standards body owned by the card networks, published a draft framework for card-based agentic payments on 1 September 2026, built around 'Intent Services', a shared record of what the consumer authorised the agent to do that persists 'before, during and after a transaction', and it says it may add 'Know Your Agent' and an agentic transaction indicator in future publications. Feedback closes on 30 September 2026. None of that is a chargeback rule. Nothing we could find in either network's published material shifts liability for an agent-initiated purchase off the merchant, and nothing creates a new reason code for one.
That matters because the evidence you would use to fight a dispute does not exist for an agent-initiated sale. The behavioural signals a human checkout produces, a browser session, a device, a typing pattern, are not there, and the authentication step that a human completes is one of the things the agent exists to skip; we covered where that leaves an issuer when Visa retired its frictionless-checkout framework this month. Stripe's answer is that a Shared Payment Token can be 'scoped to a specific business, limited by time or amount, revoked at any time', and that risk signals 'such as likelihood of card testing or stolen cards' travel with the token for Radar to read; those are fraud controls, and they are useful, but they do not tell an issuer who authorised the purchase. Until the networks say otherwise, treat every agent-initiated sale as a card-not-present sale with less evidence than usual, and remember that it counts toward the same dispute-ratio thresholds as every other sale.
A year ago the industry said agents would complete your purchases by Christmas. In September the network that said it told an investor conference they are completing the shopping and leaving the purchase to you. That is not a failure of the technology so much as a description of where the liability sits, and until the rules move it, that is where the payment will stay.
