allowed_category_restriction_during_product_import

add_action( 'woocommerce_product_import_before_process_item', function($data) {
    if(empty($data['category_ids'])) return;
    if(wcfm_is_vendor()) {
        $vendor_id = apply_filters('wcfm_current_vendor_id', get_current_user_id());
    } elseif(isset($data['store'])) {
        $vendor_id = $data['store'];
    } elseif(isset($data['meta_data'])) {
        foreach($data['meta_data'] as $meta) {
            if($meta['key'] == '_wcfm_product_author') {
                $vendor_id = $meta['value'];
                break;
            }
        }
    }
    if($vendor_id) {
        $cache_key = 'wcfm-vendor-capabilities-' . $vendor_id;
        $vendor_capability_options = wp_cache_get( $cache_key, 'wcfm-vendor-capabilities' );

        if( empty( $vendor_capability_options ) ) {
            $vendor_capability_options = (array) apply_filters( 'wcfmgs_user_capability', get_option( 'wcfm_capability_options' ), $vendor_id );
            wp_cache_set( $cache_key, $vendor_capability_options, 'wcfm-vendor-capabilities' );
        }
        $allowed_categories = $vendor_capability_options['allowed_categories'] ?? [];
        if(empty($allowed_categories)) return;
        foreach($data['category_ids'] as $cat_id) {
            $category = get_term($cat_id, 'product_cat');
            if (is_wp_error($category) || !$category) {
                continue;
            }
            if ($category->parent == 0 && in_array($cat_id, $allowed_categories)) {
                return;
            }
            while ($category->parent != 0) {
                $category = get_term($category->parent, 'product_cat');
            }
            if(in_array($category->term_id, $allowed_categories)) {
                return;
            }
        }
        throw new Exception( 'category not allowed' );
    }
} );