Way to edit the GTIN, UPC, EAN or ISBN fields
GTIN, UPC, EAN, or ISBN fields in most cases are stored as meta fields with the following keys: _gtin, _ean, _upc, _isbn, _global_unique_id in woocommerce plugin (type number). So no matter what plugin you use to keep this data, just define in what meta key its keeps and use it.
First, add these fields by hands in the Meta tab and click the Save button. Then, after the page reloads, go to the Settings tab, enable them one by one, and click Save again.
That’s it! 😊
