For some products, eBay requires that a UPC number be provided when listing a product. A UPC (Universal Product Code) is a is a barcode symbology that is widely used in the United States, Canada, United Kingdom, Australia, New Zealand, in Europe and other countries for tracking trade items in stores. It consists of 12 numeric digits, that are uniquely assigned to each trade item.
To add UPC's to your listings, please add it to your ecommerce platform. Our system will sync and import the details and add it to your eBay listings.
You can check GTIN existence here https://gepir.gs1.org/index.php/search-by-gtin
Also this website here can when checking UPC numbers - https://www.upcitemdb.com0