Judgment of the Court (Sixth Chamber) of 9 September 2021.#« Toplofikatsia Sofia » EAD and Others.#Requests for a preliminary ruling from the Sofiyski rayonen sad.#Reference for a preliminary ruling – Article 20(2)(a) TFEU – Second paragraph of Article 47 of the Charter of Fundamental Rights of the European Union – Regulation (EC) No 1206/2001 – Cooperation between the courts of the Member States in the taking of evidence in civil and commercial matters – Article 1(1)(a) – Regulation (EU) No 1215/2012 – Jurisdiction and the recognition and enforcement of judgments in civil and commercial matters – Article 5(1) – Outstanding debts – Legal decisions – Orders for payment – Service – Debtor residing at an unknown address in a Member State other than that of the court seised.#Joined Cases C-208/20 and C-256/20.