Case C-259/18: Judgment of the Court (Eighth Chamber) of 2 May 2019 (request for a preliminary ruling from the Juzgado de lo Mercantil no 3 de Madrid — Spain) — Sociedad Estatal Correos y Telégrafos SA v Asendia Spain SLU (Reference for a preliminary ruling — Directive 97/67/EC — Common rules for the development of the internal market in postal services — Provision of the universal postal service — Exclusive rights of the designated operator — Issue of means of payment for postage other than postage stamps)