Case C-307/16: Judgment of the Court (Fifth Chamber) of 28 February 2018 (request for a preliminary ruling from the Naczelny Sąd Administracyjny — Poland) — Stanisław Pieńkowski v Dyrektor Izby Skarbowej w Lublinie (Reference for a preliminary ruling — Directive 2006/112/EC — Value added tax (VAT) — Article 131 — Article 146(1)(b) — Article 147 — Exemptions on exportation — Article 273 — Legislation of a Member State making the benefit of the exemption subject to the attainment of a minimum level of turnover or the conclusion of an agreement with a person authorised to make VAT refunds to travellers)