What is the product GTIN code for?

A GTIN identifies a trade item. Use codes actually assigned to your products; do not invent a number to fill a missing field.

In Feed management → Feed data options, select the preferred source. The module processes it as follows:

These internal length checks validate neither assignment nor the GTIN check digit. They do not validate GTIN-14 codes or define the specifications for all Meta destinations.

Fill in the exported product's or combination's field, regenerate and inspect g:gtin in the XML. The “without EAN/UPC” exclusion is separate from ISBN preference; inspect its diagnostic before assuming that ISBN satisfies that exclusion.

If an item has no GTIN, do not invent one: provide its other real data and consult the applicable Meta specifications. See MPN and brand.

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