The Universal Commerce Protocol (UCP) uses the Google Merchant Center feed as its primary discovery layer and requires attributes beyond the standard feed. Assert the native_commerce attribute to declare a product eligible for agentic checkout, keep a strict correlation between the feed ID and the product ID used in the Checkout API, and use the consumer_notice attribute for any product warnings. Add complete return-policy data (costs, windows, policy links) and structured customer-support data so agents can validate the merchant of record and handle basic queries. Google recommends adding these UCP-specific attributes via a supplemental feed to avoid formatting errors in the primary feed.
Full guide → Agentic Commerce Optimization (ACO) & UCP Protocol
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