UCP integration hub added cart transfer, native checkout on Google and identity linking

Google expanded the Universal Commerce Protocol integration hub so merchants using UCP-powered checkout can also enable cart transfer to their own site, native checkout on Google, identity linking and enhanced checkout flow testing. The capabilities are rolling out gradually in the US, with Australia and Canada to follow in early 2027.

• New capabilities: transfer to merchant cart, native checkout on Google, identity linking, and enhanced checkout flow testing.
• Google said analytics for these flows is "coming soon."
• Rollout is gradual in the United States first; Australia and Canada follow early next year.
• UCP account integration support landed in the Merchant API in August 2026; this is the merchant-facing hub catching up.