Case C-463/14: Judgment of the Court (Third Chamber) of 3 September 2015 (request for a preliminary ruling from the Administrativen sad — Varna — Bulgaria) — Asparuhovo Lake Investment Company OOD v Direktor na Direktsia ‘Obzhalvane i danachno-osiguritelna praktika’ Varna pri Tsentralno upravlenie na Natsionalnata agentsia za prihodite (Reference for a preliminary ruling — Common system of value added tax — Directive 2006/112/EC — Articles 24(1), 25(b), 62(2), 63 and 64(1) — Meaning of ‘supply of services’ — Subscription contract for the supply of consulting services — Chargeable event — Need for proof of the actual supply of services — Chargeability of the tax)