gtin

The Global Trade Item Number (GTIN) of the product. This field must be a UTF-8 encoded string with a length limit of 128 characters. Otherwise, an INVALID_ARGUMENT error is returned. This field must be a Unigram. Otherwise, an INVALID_ARGUMENT error is returned. Corresponding properties: Google Merchant Center property gtin. Schema.org property Product.isbn, Product.gtin8, Product.gtin12, Product.gtin13, or Product.gtin14. If the value is not a valid GTIN, an INVALID_ARGUMENT error is returned.