Judgment of the Court (Fourth Chamber) of 2 September 2021.#DM and LR v Caisse régionale de Crédit agricole mutuel (CRCAM) - Alpes-Provence.#Reference for a preliminary ruling – Approximation of laws – Payment services in the internal market – Directive 2007/64/EC – Articles 58 and 60 – Payment service user – Notification of unauthorised payment transactions – Liability of the payment service provider for those transactions – Action for liability brought by the guarantor of a payment service user.#Case C-337/20.