Wire transfer
Get an email with the bill, then make a bank transfer and get the confirmation later, as soon as the money arrives.

SEPA wire transfer
Get an email with the bill, then make a SEPA bank transfer and get the confirmation later, as soon as the money arrives. The bill has to be paid immediately.

SEPA wire transfer
Get an email with the bill and the confirmation, then make a SEPA transfer for the event fee. The bill has to be paid immediately.