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- Reference code. This is your own internal reference. It might be a number, or its reference from the storage location or its supplier, or anything that makes it unique.
- ISBN. ISBN is used internationally to identify books and their various editions. If your products are books or entitled to have an ISBN number, enter it here.
- UPC barcode. This standard for barcodes is mostly used in the United States, Canada, the United Kingdom, Australia, New Zealand.
- EAN-13 or JAN barcode. These are the numbers of the product's barcode, which are used worldwide in order to identify it. You can use either an EAN-13 or a JAN number.
- An EAN-13 is the product's 13-digit international article number. You need to order it Order it on GS1 as soon as the your product is created on GS1 to be able to sell it with Google Shopping, or on marketplaces. Read more on Wikipedia: http://en.wikipedia.org/wiki/International_Article_Number_%28EAN%29.
- A JAN is specific to Japan, but is compatible with the international EAN. Read more on Wikipedia: http://en.wikipedia.org/wiki/Japanese_Article_Number.
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