Question juridique clé
Whether the constitutional complaint was admissible despite the unpaid court advance.
Solution extraite
The complaint was not admitted because the appellant failed to pay the required advance within the non-extendable grace period.
Motifs extraits
After proper warning under Art. 62(3) BGG, the advance was neither paid in cash nor validly credited through a Swiss postal or bank account, and no timely debit confirmation was filed.