Key legal question
Whether the constitutional complaint was admissible despite non-payment of the required cost advance.
Extracted holding
The complaint could not be entertained because the appellant did not pay the advance within the non-extendable grace period and did not prove timely payment by debit confirmation.
Extracted reasoning
After a warning under Art. 62(3) BGG, non-payment of the advance and failure to furnish the required proof triggered non-entry under Art. 117 BGG in conjunction with Art. 108(1)(a) BGG.