Agentic Commerce in October 2026: What ChatGPT, Google, Copilot, Amazon and Meta Actually Need From Your Store

"Agentic commerce" means AI assistants that find, compare and sometimes buy products for a person. In 2026 every large platform launched something under that name: Google a protocol and a cart, Microsoft a checkout inside Copilot, Amazon an agent that buys from other shops' websites, Meta a personal agent that pays by card. OpenAI, which started the wave with checkout inside ChatGPT in September 2025, stepped back from it six months later.

For a store, the picture on 22 October 2026 is simpler than the announcements suggest. Being found by AI assistants is real, growing fast from a small base, and it runs on product feeds. Being bought from inside an assistant is gated, almost entirely limited to the United States, and still counted in hundreds of transactions, not millions. Most of what a store has to do is make its catalogue complete, current and readable by machines.

This article goes through each platform as it stands today: what it reads, where the purchase happens, which countries it covers, how to get in, and what a store on its own software has to build. Five companion articles go deeper: the ACP, UCP and AP2 protocols, agentic payments, WebMCP, x402 and machine payments and Amazon Buy for Me.

The Short Version

• ChatGPT shows products from feeds and sends shoppers to your own checkout. Instant Checkout is gone for ordinary merchants. Feeds are open to approved partners from a waitlist, in the US only, and Shopify and Etsy catalogues are already in.
• Google lets AI Mode and Gemini sell through its Universal Commerce Protocol, but only for selected US merchants who build the integration and are approved. Everyone else is shown through Merchant Center as before.
• Microsoft Copilot has a checkout run through PayPal or Stripe, as a pilot, for English-language merchants selling to US buyers in dollars.
• Amazon lists products from more than 400,000 outside shops and can buy from their websites for its customers. A US store can be included without asking and has to email to leave.
• Meta's Muse agent browses sites and pays with a one-time card. It needs nothing from you unless you want to be a named connector.
• Shopify stores are in all of these channels by default. Stores on other software do the work themselves, mostly as product feeds.

What Changed in 2026

Platform by Platform

ChatGPT

OpenAI's Instant Checkout let US users buy single items inside the chat. On 24 March 2026 OpenAI changed course: "the initial version of Instant Checkout did not offer the level of flexibility that we aspire to provide, so we're allowing merchants to use their own checkout experiences while we focus our efforts on product discovery." Its merchant page now says purchases "are completed on merchant-owned websites or apps", with "no fees for purchases made on your site or app". Instant Checkout survives only as a beta "available only to select marketplace partners" inside ChatGPT apps. Walmart went another way, with its own ChatGPT app that supports "account linking, loyalty and Walmart payments".

What ChatGPT reads is a product feed. The specification has nine required fields (item_id, title, description, url, brand, seller_name, image_url, availability, price), delivered as a full snapshot over SFTP "at least daily", with updates and promotions through an API. Target, Sephora, Nordstrom, Lowe's, Best Buy, The Home Depot and Wayfair are integrated, and feeds can also arrive through Salesforce and Stripe. The limits: "Shopping is currently live for ChatGPT users in the U.S.", the standard upload "currently targets the US" whatever the rows say, and onboarding "is currently available to approved partners". A self-serve platform is promised "later this year". Shopify and Etsy sellers are already included and need do nothing.

Google AI Mode, Gemini and Universal Cart

Google launched UCP on 11 January 2026 to let AI Mode in Search and the Gemini app take orders, with the retailer remaining "the seller of record". On 15 October Universal Cart followed in the US: shoppers collect items from several stores, then "check out with Google Pay ... right in the cart" or "transfer your items directly to the merchant's cart to finish buying on their site".

Checkout is not open to everyone. Google's Merchant Center guide says: "The checkout feature enabled by UCP is available for select merchants. To participate in this early access program, submit the interest form and complete the required technical implementation", and "this applies only to products sold within the United States." The integration must be approved by Google before it goes live. Canada and Australia are due "early next year"; in May Google had said "in the coming months". The UK has no date.

The feed attribute that switches a product on, native_commerce(checkout_eligibility), "defaults to FALSE". Merchant Center also needs a return policy with cost, window and link, and a support contact. Subscriptions, instalments, personalised goods, used and refurbished items, pre-orders, age-restricted goods, freight items, services, rentals and virtual items are excluded. Separately, Google's conversational attributes (questions and answers, related products, documents) are optional and open to "retailers globally". In travel, hotel booking in AI Mode reached the US in English on 27 August, with ten named chains and booking sites.

Microsoft Copilot

Copilot Checkout launched on 8 January 2026 on Copilot.com in the US. Shopify merchants "will automatically be enrolled in Copilot Checkout following an opt-out window"; others apply through PayPal or Stripe, and Microsoft says that the payment provider "will handle the integration in partnership with you, from start to finish". Microsoft Merchant Center has accepted UCP-ready feeds since 21 April, generally available in the US; the feed needs native checkout eligibility, product warnings where required and a merchant item ID.

The conditions: checkout is "Pilot only to select customers", "Only English‑language merchants who sell to US buyers are eligible at this time (supporting USD)", one payment provider per merchant, and for other countries "we cannot provide a timeline at this time". Microsoft takes no commission. Its own summary of what matters is worth repeating: "Feeds primarily enable discovery (products showing up in AI responses), while UCP enables transactions".

Amazon Buy for Me and Shop Direct

Shop Direct shows products from other retailers' websites inside Amazon, and Buy for Me lets Amazon's AI buy them: "Amazon's AI then securely completes the purchase from the merchant's website using the customer's encrypted payment and shipping information." Since 11 March 2026 it covers "over 100 million products from more than 400,000 merchants", for US customers.

Participation is opt-out. The merchant FAQ says: "If you do not wish for your website to participate in this service ... contact us at shopdirect@amazon.com and we'll respond within 2 business days." There is no fee, the merchant stays the seller of record, orders may carry "a secure, unique email address for each order", and visits arrive tagged utm_source=AMZN_US_ShopDirect. One detail matters if you plan to join through a feed: Feedonomics, one of the named syndicators, says Buy for Me is not yet offered on products sent by feed, which suggests those appear in Shop Direct as links to your site rather than as Buy for Me items. Our Amazon Buy for Me guide covers handling these orders.

Meta Muse

Muse, launched on 8 September 2026 in the US, "can open a browser, fill out forms, and negotiate" for its user, and pays with Link by Stripe, which "generates a one-time-use card". It asks the user before a purchase. Because it can browse, it needs nothing from a store to buy there. A company that wants to be a named Muse connector must do more: Meta's guidelines say a connector should complete bookings and purchases itself, and "Sending the user to finish the entire checkout does not meet the completion requirement."

Shopify: The Default Path

Shopify's agentic storefronts are "active by default for eligible stores" and syndicate products to ChatGPT, Google AI Mode and Gemini, Copilot and Meta. Direct checkout inside Google and Copilot is on by default and shown only to US shoppers; Meta's is shown to shoppers in the US, Canada and Mexico. Some checkout customisations do not load in these direct checkouts. Headless stores must publish to the Headless channel and use Shopify's route format to stay in the Catalog. A brand on another platform can join through the Agentic plan, with an external product URL per product.

What the Numbers Say

Traffic from AI assistants to shops is growing quickly, from very little. Adobe, which measures over a trillion visits to US retail sites and sells the analytics, reported that AI-referred traffic to US retail sites grew 393% year on year in the first quarter of 2026, and that in March it "converted 42% better" than other traffic, a reversal from a year earlier. Growth slowed to 62% in July. Adobe also scored product pages as the least machine-readable part of retail sites, at 66%. Similarweb counted an average of 770.7 million AI referral visits a month worldwide between June 2025 and May 2026, "a low single-digit percentage of most sites' total traffic". Bain, with Similarweb data in November 2025, put AI at "up to 25% of referral traffic for some retailers, though it is still less than 1% of total traffic". On its second-quarter earnings call in August, Shopify said AI-driven traffic and orders to its stores had tripled year on year, while the volume was "still small relative to our massive GMV", and that "half of all AI-referred sessions are landing directly on a product description page."

Purchases completed by an agent are another matter. Accertify, a fraud-prevention company, wrote on 9 October 2026 that "As of September 2026, Accertify has observed hundreds of completed agent-initiated transactions globally, against tens of millions of daily card transactions." Forrester's analyst Emily Pfeiffer wrote in May: "True autonomy is rare", and "Most commerce-related value from answer engines today comes from comparison and guidance, not native transactions." Walmart's Daniel Danker told WIRED in March that purchases inside ChatGPT converted at about a third of the rate of shoppers who clicked through to Walmart's site. And in Bain's consumer research, "around half still say they are cautious about letting AI agents autonomously handle purchases from start to finish."

The practical reading: put your effort where shoppers are being sent, which is your own product pages, by assistants that read your feed.

What a Store on Its Own Software Has to Build

If you run Shopify, the platform does most of this. If you run WooCommerce, Magento, a commerce platform such as Salesforce or commercetools, or software of your own, this is the work, in order of how much the evidence supports it.

1. A complete, current product feed for each platform. It is the one thing every programme asks for. For Google: your Shopping feed, plus native_commerce(checkout_eligibility) if you join checkout, consumer_notice where a legal warning is required, merchant_item_id if feed and checkout IDs differ, and optional conversational attributes in a supplemental source. For OpenAI: the nine required fields, a daily full file over SFTP (Parquet is preferred) and API updates for price, stock and promotions. For Microsoft: the UCP-ready feed attributes. For Amazon: a feed through a supported syndicator. Price, availability and shipping must match what your checkout will charge, or the shopper arrives to a different price.
2. Product pages a machine can read. Public URLs and images, prices and stock in the HTML, and real buttons and labelled fields that an agent can operate. Google's own guidance is that "Structured data isn't required for generative AI search", and that it does not use llms.txt or other "AI text files". Keep schema.org markup for rich results; do not expect it to buy AI visibility.
3. A checkout an agent can complete, only where a programme asks for one. For Google: a public profile at /.well-known/ucp, three checkout-session endpoints with Google's latency targets (completion in 6 seconds at the median), a Google Pay payment handler and order webhooks, or the lighter cart path that hands the cart back to your site. For Copilot, your payment provider builds it. ChatGPT and Amazon need nothing: purchases finish in your normal checkout. The protocols article covers the technical detail.
4. Operations for agent orders. Amazon Buy for Me orders arrive with per-order forwarding addresses; Shop Direct and AI channel visits carry their own tags. You remain the merchant of record in every programme, so customer service, returns and fraud review stay yours. Check that your fraud rules do not decline an order just because the buyer's email is a relay address.
5. A deliberate bot policy. Decide which agents may reach your product pages and your checkout, and configure your CDN to match (next section).

Agents at the Door

Automated traffic is now sorted into kinds, and the defaults are changing under merchants' feet. Cloudflare split AI traffic into Search, Agent and Training on 1 July 2026; since 15 September, new domains block Agent and Training bots on pages that show ads by default, and Cloudflare is "no longer viewing Verified as "default allowed."" Shopify has applied "stricter rate limits to bots and agents" that do not sign their requests since May. Signing uses Web Bot Auth, an IETF working-group draft. OpenAI's cloud browser signs its requests; Google signs "a subset" of Google-Agent requests "as an experiment".

The largest marketplaces keep outside agents out. Amazon's robots.txt disallows ChatGPT-User, Claude-User, Perplexity-User, GoogleAgent-Shopping and Copilot, and its Conditions of Use require an agent to identify itself as "Agent/[agent name]" and to stop when asked. eBay's User Agreement has banned "buy-for-me agents, LLM-driven bots" without its permission since 20 February 2026, and its robots.txt says: "Checkouts are strictly for human users." In the US the courts have not settled the question: on 4 August 2026 the Ninth Circuit vacated the preliminary injunction Amazon had won against Perplexity's shopping assistant, holding on that record that "It is the user who "accesses" Amazon's computers", while noting that this "does not impair Amazon's ability to regulate access ... via private terms of service". The case continues in the district court.

For a store, the decision is commercial: an agent that reaches your checkout is usually bringing a paying customer. Choose per category, check what your CDN now does by default, and write your terms to match. Verifying agent signatures at your own edge, and what Visa and Mastercard require, is covered in the payments article.

Outside the United States

Almost nothing above is live for stores outside the US. ChatGPT shopping, Google's checkout, Copilot Checkout, Amazon Shop Direct and Muse are all US-only for now. The exceptions are narrow: Meta's direct checkout through Shopify reaches shoppers in Canada and Mexico, Google's conversational attributes are open globally, and ChatGPT ads (advertising, not shopping) reached 31 European markets in August.

Elsewhere, the activity is inside the large platforms' own walls:

• European Union. The AI Act's transparency duty under Article 50(1) has applied since 2 August 2026, and the Commission's guidelines on it say that "AI agents are covered by Article 50(1) AI Act if they are capable of interacting with the persons instructing them or with other natural persons in the execution of the tasks (e.g. making bookings, ... executing purchases, etc)", and must disclose "both their artificial nature and the person on whose behalf they are acting". The duty falls on the provider of the agent, which includes a shop running its own shopping assistant.
• Japan. LY Corporation says about 20% of Yahoo!ショッピング's transaction value went through its AI agent in July 2026. That is LY's own assistant inside its marketplace, not outside agents buying from stores. Japan's Consumer Affairs Agency said on 15 October 2026 that existing mail-order rules, including the final confirmation screen, still apply, that a legal assessment of agent purchases is difficult for now, and that it will first study how such transactions work.
• China. WeChat told mini-program developers in June that a mini program not connected to WeChat AI "cannot be recommended or called by it"; the developer mode is still in internal testing. Alipay sells agent payments to agent platforms and merchants. The national internet regulator's May 2026 opinions on AI agents say an agent must not act beyond what the user authorised; they are policy guidance, not penalties.

If you sell into the US from abroad, the US programmes may still apply to you; check each one's conditions on where the merchant must be based.

What to Do Now

• On Shopify: review the AI channels and direct checkouts in your admin, and switch off what you do not want. Check that the checkout customisations you rely on load in direct checkouts.
• On another platform or your own software, selling in the US: get your Google feed right first, then apply for OpenAI's waitlist and Microsoft's UCP feed. Decide whether to stay in Amazon Shop Direct. Build Google's checkout integration only if you are accepted into the early access programme and your products are eligible.
• Selling outside the US: keep your Google Merchant Center feed complete and add conversational attributes; watch for Canada and Australia in early 2027. Fix the product pages agents land on.
• Everyone: decide your bot policy, and make sure your fraud rules and customer service know what an agent order looks like.

What to Watch

• OpenAI's self-serve merchant platform, promised "later this year".
• Google's checkout in Canada and Australia, "early next year", and a UK date.
• Microsoft's Copilot Checkout leaving its pilot.
• Amazon's merchant portal for direct feeds, announced as "coming soon" in March.
• Whether agent-completed purchases grow beyond the hundreds Accertify counted in September.

Where to Get Help

We build what agentic commerce asks of a store that does not run Shopify: product feed pipelines from your catalogue to Google, OpenAI, Microsoft and Amazon, checkout integrations where a programme accepts you, agent-friendly product pages, and the order handling behind them. Our AI agent development and MCP integration service is where that work starts, and we can also help you decide which programmes are worth joining for your market.

Write to office@c9group.dev with your platform and the countries you sell in, and we will tell you what applies to you today.