Hi,
So in that case, I would recommend to implement the "onAfterOrderUpdate(&$order)" trigger in a plugin of the group "hikashop".
In it, you would first check the new and old status, and then load the order data and get the info of the billing address:
if($order->order_status != $order->old->order_status && $order->order_status == 'confirmed') {
$orderClass = hikashop_get('class.order');
$orderData = $orderClass->loadFullOrder($order->order_id, false, false);
echo $orderData->billing_address->address_city;
// etc
}