Can I change the initially chosen method of payment at any given time?
Yes, that's easily possible under "My account" - "Change".
Please note that you can sometimes also pay invoices which have already been issued using a different method of payment. The alternatives bank transfer (to a German account), credit card or Paypal are always possible.
You can make payments by Paypal or credit card under the menu item "My invoices". When making a bank transfer to our bank account (see invoice PDF) please state the invoice number.
Please be sure to avoid double payments and allow several working days in the case of payment by bank transfer.

