Case C-265/22, Banco Santander (Reference to an official index): Judgment of the Court (Ninth Chamber) of 13 July 2023 (request for a preliminary ruling from the Juzgado de Primera Instancia n. 17 de Palma de Mallorca — Spain) — ZR, PI v Banco Santander, SA (Reference for a preliminary ruling — Consumer protection — Directive 93/13/EEC — Unfair terms in consumer contracts — Mortgage loan agreements — Term providing for a variable interest rate — Reference index based on the annual percentage rates of charge (APRC) of mortgage loans granted by credit institutions — Index established by a regulatory or administrative act — Information contained in the preamble to that act — Check relating to the requirement of transparency — Assessment of the unfair nature of the term)