Google will start enforcing the requirements to have unique product identifiers on your product listing feeds with Google Merchant Center tomorrow, September 15, 2021, the search company announced.
What are unique product identifiers (UPIs). Google said a unique product identifier, also known as UPIs, are considered products that include Global Trade Item Numbers (GTINs), Manufacturer Part Numbers (MPNs), and brand names in the product feed you submit to Google Merchant Center.
