Case C-544/21: Judgment of the Court (Ninth Chamber) of 27 October 2022 (request for a preliminary ruling from the Landgericht Mainz — Germany) — ID v Stadt Mainz (Reference for a preliminary ruling — Freedom to provide services — Directive 2006/123/EC — Article 15(1), (2)(g) and (3) — Services in the internal market — Fees of architects and engineers — Fixed minimum tariffs — Direct effect of provisions of EU law and possible inapplicability of national legislation)