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Posted a reply to New field “GTIN, UPC, EAN, or ISBN” not being exported, on the site WordPress.org Forums:
// Add the custom column to the export columnsadd_filter('woocommerce_product_export_column_names', 'add_custom_gtin_export_column');function add_custom_gtin_export_column($columns) {$columns['global_unique_id'] = 'GTIN/UPC/EAN/ISBN';return $columns;}//…