Question juridique clé
Whether the constitutional complaint should be entered into despite the unpaid advance costs.
Solution extraite
No. The complainant did not pay the advance within the non-extendable deadline and did not provide proof of timely payment, so the complaint could not be heard.
Motifs extraits
After the warning under Art. 62(3) BGG, non-payment triggered non-entry under Art. 108(1)(a) BGG.