Case C-584/17 P: Judgment of the Court (Third Chamber) of 16 July 2020 — ADR Center SpA v European Commission (Appeal — Arbitration clause — Grant agreements concluded in the context of the Specific Programme ‘Civil Justice’ for the period 2007-2013 — Audit reports questioning the eligibility of certain costs — European Commission decision to recover unduly paid sums — Article 299 TFEU — Power of the Commission to adopt an enforceable decision within contractual relationships — Jurisdiction of the EU judicature — Effective judicial protection)