Kernrechtsfrage
Whether the appeal was admissible despite the appellant's failure to pay the court cost advance within the non-extendable deadline.
Extrahierter Entscheid
The appeal could not be entered into because the cost advance was not paid or duly evidenced within the deadline.
Extrahierte Begründung
After a warning under Art. 62(3) BGG and a final non-extendable deadline, the appellant neither paid in cash nor deposited the advance through the permitted postal/bank channels, nor submitted proof of timely debit.