Case C-68/23,  Finanzamt O (Single-purpose vouchers): Judgment of the Court (Ninth Chamber) of 18 April 2024 (request for a preliminary ruling from the Bundesfinanzhof - Germany) - M-GbR v Finanzamt O (Reference for a preliminary ruling – Common system of value added tax (VAT) – Directive 2006/112/EC – Articles 30a and 30b – Vouchers supplied electronically – Single-purpose and multi-purpose vouchers – Prepaid cards or voucher codes for the purchase of digital content, with a ‘country’ identifier making the digital content in question accessible only in the Member State in question)