Kernrechtsfrage
Whether the appeal had to be entered into despite the unpaid advance costs.
Extrahierter Entscheid
No. Because the appellant did not pay the advance costs within the non-extendable grace period and did not prove timely payment by debit confirmation, the appeal could not be considered.
Extrahierte Begründung
After a warning under Art. 62(3) BGG, non-payment of the advance costs within the final deadline requires non-entry under Art. 108(1)(a) BGG.