A message is always sent, even if a container is not discharged. In that case, 2 months after the request, a so-called closure message is sent. For every request, regardless of whether a discharge confirmation has been sent, a transaction charge of 0.18 euros is levied. This is because infrastructure costs are incurred by Portbase in order to process and link the request. Of course in this case the customer is not charged a kickback fee for the data owner.