Invoices with "qualified electronic signature" are fortunately no longer required by law since September 2011.
You will receive all Planio invoices via email as regular PDF attachment. You can easily save or print those for your records.
Should you need access to past invoices, please visit Your Avatar -> Customer Account -> Account Management -> Invoices.
If you would like to have your invoices sent to you by regular mail, please let us know. We will send them to you every month at a cost of 1.50€/month.