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Shopify announced on September 28 that browser-based AI agents will now be able to complete orders on merchant sites. Beyond product search and adding items to carts, the company has introduced WebMCP support for payment processing, including Shop Pay. Transactions can be completed once buyer approval is obtained. While Amazon and Adidas are blocking AI agents from making purchases on behalf of users, Shopify has clearly embraced an acceptance strategy. The company is also forging direct partnerships with major AI agents such as Muse and Instinct, accelerating its infrastructure build-out for an era in which AI becomes a primary actor in commerce.
Key Elements
Shopify, the Canadian e-commerce infrastructure company, has opened up order completion by browser-based AI agents to its merchants. AI purchasing activity, which had previously been limited to product search and adding items to carts, can now flow seamlessly through to payment completion. With Amazon and Adidas blocking AI agents from making proxy purchases, Shopify has effectively steered in the opposite direction.
Gil Greenberg, a product manager overseeing AI agent purchasing and payments at the company, revealed in a September 28 post on X (formerly Twitter) that WebMCP support has been introduced for payment processing, including Shop Pay. The rollout will proceed across all eligible merchants.
Shopify had previously supported WebMCP at the storefront and cart stages, allowing AI agents to search inventory and add products to carts through structured tools. However, reading cart contents and confirming orders had not been possible. With this update, agents will be able to complete transactions after obtaining buyer approval.
According to Greenberg, the conventional approach of manipulating human-facing HTML in a browser was inefficient. Agents would load a page, locate input fields, enter information, and reload the page to verify changes—repeating this process field by field. Mistakes in data entry were also common, often making shopping more time-consuming rather than less.
The newly introduced tools come in three varieties: “get_checkout,” which reads the checkout state; “update_checkout,” which updates shipping destinations and pickup methods; and “complete_checkout,” which attempts to finalize the order after buyer approval. These tools will enable retrieval of products, total amounts, shipping options, and any conditions blocking the order.
These tools are built on the Universal Commerce Protocol (UCP), a common commerce protocol provided by Shopify. UCP is a framework for handling product search and discovery, cart building, and payments in a standardized way, while WebMCP is a standard designed specifically for agents operating within the buyer’s browser. Shopify already offers hosted MCP servers for running agents server-to-server.
In his post, Greenberg explained that when running agents in the buyer’s browser, order completion can be accomplished efficiently by using the WebMCP tools available at the storefront and checkout rather than manipulating human-facing HTML. He noted that these tools are designed through UCP, ensuring accurate commerce information, required disclosures, and handoff requirements.
On the AI agent partnership front, major agents such as Muse and Instinct have already established direct partnerships with Shopify. The Instinct partnership was announced on the same day as this news. Noah Shinn, the creator of Instinct, stated on X that 35% of users employ the agent for personal shopping, and that the Shopify partnership enables product discovery, checkout, and order status updates to be integrated into a single conversation.
A Divided Industry Response
The retail industry is split on the issue of AI agents making proxy purchases. Amazon blocks AI agents from purchasing on behalf of users on its platform, and Adidas is reported to have adopted a similar stance.
Shopify, by contrast, has chosen a strategy of actively embracing AI agents as a new entry point for commerce. As the back-end infrastructure provider for e-commerce, the company occupies a neutral position that does not depend on individual retailers. By providing the infrastructure for an era in which AI agents become the primary actors in shopping, Shopify aims to strengthen its presence as a platform.
Future Implications
The practical application of AI agent purchasing has the potential to reshape the structure of e-commerce. Consumers will be able to delegate everything from product search to price comparison and order confirmation to agents, and retailers will find that—alongside traditional site design built around human browsing—the development of structured data and APIs for machine readability will directly impact competitiveness.
At the same time, challenges remain: who approves purchases and how, and where responsibility lies for erroneous orders or fraudulent use. Shopify makes buyer approval a mandatory condition, and the design prevents agents from confirming orders on their own. That said, transparency in AI-involved transactions and consumer protection frameworks are expected to become subjects of serious discussion among regulators and industry bodies going forward.
For merchants, a new sales channelgents may well determine revenue outcomes in certain scenarios. Shopify’s move marks a turning point in AI’s evolution from a mere search assistant to an executor of transactions
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