GTIN Unique Product Identifier google merchant

A GTIN (Global Trade Item Numbers) uniquely identifies your product.
This specific number helps us to make your ad richer and easier for users to find.
Products submitted without any unique product identifiers are difficult to classify and may not be able to take advantage of all Shopping ad features.
When a GTIN is available, it will appear next to the barcode on your product's packaging or book cover.
Submit GTINs in your product data using the gtin attribute to help us classify and display your products on Shopping ads.

Some products don’t have a GTIN assigned, so you don’t need to submit one. However, if the product does have a GTIN assigned and you don’t submit it, then the product could be disapproved.

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