Google Merchant Center UCP: cart transferred to the site

What Google's cart transfer really does

Cart transfer is a feature that allows a user to add a product to their cart directly from the Google tab — in Shopping results or ads — and find that cart already populated when they arrive on the merchant's site. No product searching, no manual additions: the path to payment is shortened.

Google is rolling this out through the UCP hub, which is the unified Merchant Center area designed to manage feeds, campaigns, and performance all in one place. According to reports by Search Engine Journal , the update also includes tools to test checkout and a YouTube ads beta, plus new AI insights — automatic suggestions generated by the algorithm on campaign data.

Whose routine changes this week

The feature is relevant if these conditions are met:

• you have an active e-commerce store with Google Shopping or Performance Max campaigns;
• your Merchant Center has already been migrated to the UCP hub (or is in the process of being migrated);
• the site supports receiving cart parameters via URL or Google APIs.

If you only sell in physical stores, or if your Google campaigns aim to generate leads rather than direct transactions, this novelty doesn't change anything immediately. However, those who manage significant volumes on Shopping know well that every percentage point of abandonment in the transition from ad to checkout has a direct cost on ROAS — the return on ad spend.

It is also worth keeping an eye on the broader topic of campaign automation: those who are already thinking about how to keep control when Google and Meta automate campaigns will find this feature to be another piece to manage, not just to enable.

Checkout testing and AI insights: what they are in practice

In addition to cart transfer, the update introduces tools to test the checkout process directly from the UCP hub. The idea is to allow the merchant to simulate the user's journey and identify friction points before they become actual abandoned carts.

AI insights, on the other hand, are automatic suggestions that Google generates by analyzing campaign data: performance anomalies, budget opportunities, changes in purchasing patterns. They don't replace human analysis, but they can flag weak signals that might be missed by those managing many accounts. The risk, as always with automatic suggestions, is applying them without checking the context. On this, the article on how advertising attribution models can trick your budget offers a useful perspective before blindly trusting the numbers Google shows.

The integrated YouTube Ads beta in the UCP hub is still rolling out to a limited group. There are no public details on access requirements.

Four action steps to take now

If you manage Shopping campaigns or have an active e-commerce store, here is what makes sense to do this week:

• Check the UCP hub : log in to Merchant Center and check if the UCP panel is already active on your account. Not all accounts have been migrated.
• Check technical compatibility : cart transfer requires your site to be able to receive and interpret the cart parameters passed by Google. Involve your development team before turning anything on.
• Don't turn it on without a measurement plan : if you enable cart transfer, define right away how you will measure the impact on conversion rate and average order value. Without a clear baseline, you won't know if it worked.
• Keep your tests separate : if you are already testing campaign or feed variants, don't overlap the activation of cart transfer. One change at a time, otherwise the data becomes unreadable.

The typical mistake and the broader context

The most common mistake with features like this is enabling them because 'Google recommends them' without checking if the site can handle the technical flow. A transferred cart that lands on a broken page, or isn't recognized by the checkout system, creates a worse experience than the original one.

There's also an ecosystem aspect. Google isn't the only player pushing integrated checkout: those who sell on multiple channels should view this move alongside what's happening on other fronts, such as the integration between Amazon Ads and ChatGPT and the new conversion dynamics that are emerging even outside traditional channels, including ChatGPT Ads click-to-chat formats .

The point isn't to chase every new thing. It's about understanding which one truly reduces friction in your customers' buying journey, and which one adds complexity without measurable benefit. For those who want to navigate the landscape of paid and video campaigns , the direction is always the same: less blind automation, more control over data.

SHM Studio follows these updates for clients managing Shopping and Performance Max campaigns: if you want to understand if cart transfer is already available on your account and if it's worth activating, Write to us .