Question juridique clé
Whether the federal appeal should be entered into despite non-payment of the cost advance.
Solution extraite
No entry could be made because the appellant neither paid the advance within the deadline nor provided the required proof of timely payment.
Motifs extraits
After a reminder under Art. 62(3) BGG and warning of non-entry, the advance remained unpaid and no valid proof of payment by bank/post transfer was submitted; therefore non-entry followed under Art. 108(1)(a) BGG.