Google is gradually rolling out a Universal Commerce Protocol integration hub in Merchant Center to selected US retailers, allowing them to configure and test AI shopping journeys. The hub supports cart transfers to retailers’ websites, checkout within Google, and account linking for loyalty benefits. Australia and Canada are expected to follow in early 2027; Google has not announced a launch date for Poland.
The UCP integration hub gives retailers a central place to configure their accounts, validate integrations, and check whether they are ready to launch. This expands Merchant Center’s role beyond product data management to include the technical setup of purchasing journeys.
Participation requires a UCP implementation and acceptance into the early access program. Having a Merchant Center account alone does not enable these capabilities. Google also specifies that the current program covers products sold in the United States.
Industry publications covered the hub in early October, including Search Engine Roundtable on October 7. However, Google had already announced integration developments on September 16, and the hub’s documentation was updated on October 2. The latest coverage reflects another stage in the rollout of UCP-powered shopping.
Retailers select the capabilities they want to support, and Merchant Center adjusts the validation process accordingly.
| Capability | What it enables |
| Cart transfer to the retailer’s website | Customers transfer their selected products to the retailer’s website and complete the purchase there. |
| Checkout within Google | Customers complete a transaction on a Google surface through an integration with the retailer’s commerce system. |
| Customer account linking | Connected accounts support loyalty benefits and purchases associated with the customer’s account. |
Cart transfer follows a simplified validation process. Checkout requires the relevant APIs, while account linking uses OAuth 2.0. Each capability requires preparation within the retailer’s technology stack.
The hub provides a sandbox environment for testing communication with the retailer’s systems. Merchants can check their UCP profile, cart transfers, and checkout operations before validating the integration in production.
Merchant Center may also flag required updates to product feed attributes, return policies, or account settings. Google advises retailers using third-party commerce platforms to contact their providers about plans to support UCP.
Google’s documentation also describes an Analytics tab for retailers with UCP enabled and the necessary permissions. Reporting includes:
These metrics measure a specific transaction journey. They should not be treated as a report on a brand’s overall AI visibility or all traffic referred by AI assistants.
Why Does This Matter for Ecommerce?
Merchant Center has traditionally helped retailers supply the product information Google needs to display their offers. The UCP hub adds another layer: connecting product interest with a cart, payment, and customer account.
For retailers, this creates two areas of preparation. The first concerns visibility and accurate product representation. The second concerns the store’s ability to handle an action initiated outside its own website.
From Delante’s perspective, preparing for agentic commerce requires collaboration between SEO, paid media, ecommerce, and development teams. A reliable product feed helps a system understand an offer. Completing the order also depends on a working integration, accurate inventory, and consistent purchasing terms.
For example, a product recommendation becomes less useful if the cart returns a different price or reveals that delivery is unavailable. A readiness assessment should therefore cover both product data and the behavior of the transaction system.
The E-commerce in Poland 2026 report, published by Gemius on September 30, adds a useful local perspective. According to its authors, 71% of respondents do not want to let AI make purchasing decisions independently.
The publication combines CAWI survey research with Mediapanel and gemiusAdReal data. September 30 is the report’s publication date, rather than the date on which the survey was conducted.
The finding concerns autonomous purchasing decisions. It does not establish that respondents reject AI assistance with product comparisons or cart preparation.
In our view, it supports designing journeys in which customers can review recommendations, edit their orders, and explicitly approve a purchase. The report does not measure interest in UCP, so it cannot predict adoption of Google’s solution in Poland. Its findings should also not be generalized to other markets.
Google has not announced when Polish retailers will gain access to the UCP hub. Retailers outside the current program can still review the consistency of their prices, variants, inventory, delivery information, and return policies. They can also ask their commerce platform providers about integration plans.
Merchant Center’s development shows Google building infrastructure for purchases initiated through AI. For retailers, the work extends from appearing in a recommendation to reliably serving the customer who acts on it.
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