Key legal question
Whether the appeal had to be entered into despite non-payment of the required advance on costs after an additional deadline.
Extracted holding
No. Because the appellant neither paid the advance nor proved timely payment by debit confirmation, the appeal could not be heard.
Extracted reasoning
After the non-extendable grace period under Art. 62(3) BGG expired without payment or proof of payment, non-entry was mandatory under Art. 108(1)(a) BGG.