Case C-455/21, Lyoness Europe: Judgment of the Court (Fifth Chamber) of 8 June 2023 (request for a preliminary ruling from the Tribunalul Olt — Romania) — OZ v Lyoness Europe AG (Reference for a preliminary ruling — Consumer protection — Directive 93/13/EEC — Unfair terms in consumer contracts — Article 2(b) — Definition of ‘consumer’ — Contract for membership of a loyalty scheme enabling certain financial benefits to be obtained when purchasing goods and services from third-party traders)