add_action('woocommerce_order_status_completed', function (int $orderId) {
    $order = wc_get_order($orderId);

    if ($order) {
        foreach ($order->get_items() as $item) {
            $isEvent = $item->meta_exists('_tbsa_eventId');
            if ($isEvent) {
                $eventPostId = $item->get_meta('_tbsa_eventId');
                $event       = em_get_event($eventPostId, 'post_id');
                $location    = $event ? $event->get_location() : null;
                $town        = $location ? $location->location_town : null;
                if ($town) {
                    // Teraz $town zawiera nazwę miasta
                }
            }
        }
    }
}, 10, 1);