Case C-583/18: Judgment of the Court (Ninth Chamber) of 12 March 2020 (request for a preliminary ruling from the Oberlandesgericht Frankfurt am Main — Germany) — Verbraucherzentrale Berlin eV v DB Vertrieb GmbH (Reference for a preliminary ruling — Consumer protection — Directive 2011/83/EU — Scope — Service contract — Article 2(6) — Contract for passenger transport services — Article 3(3)(k) — Cards conferring entitlement to price reductions when passenger transport contracts are subsequently concluded — Online selling of such cards without informing the consumer about the right of withdrawal)