Google published a commerce audience sharing help doc for retailers and their brand partners

A new Google Ads help page documents commerce audience sharing, which lets commerce partners such as retailers and marketplaces share first-party audience segments with their advertising partners such as brands and sellers. Campaigns using a shared audience may only drive traffic back to the commerce partner's own platform.

• Commerce partners share first-party data segments with trusted advertising partners to improve those partners' campaign performance.
• The key restriction: traffic from campaigns using shared commerce audiences can only point back to the commerce partner's site or app.
• The page sits alongside Google's existing commerce media documentation covering data sharing and policies.