Judgment of the Court (Ninth Chamber) of 21 September 2023.#AM and PM v mBank S.A.#Reference for a preliminary ruling – Directive 93/13/EEC – Unfair terms in consumer contracts – Mortgage loan contract index-linked to a foreign currency – Criteria for assessment of whether a conversion clause is unfair – National register of standard business terms which are held to be unlawful – Duty to provide information.#Case C-139/22.