The <a href="http://apps.gs1.org/GDD/glossary/Pages/GTIN-8.aspx">GTIN-8</a> code of the product, or the product to which the offer refers. This code is also known as EAN/UCC-8 or 8-digit EAN. See <a href="http://www.gs1.org/barcodes/technical/idkeys/gtin">GS1 GTIN Summary</a> for more details.