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On May 6, 2026, the European Payments Council (EPC) announced the official launch of API Reference Toolbox (ART) v1.1, following the successful completion of its pilot phase. The platform became available to all participants on May 7, 2026, to support the rollout of Verification of Payee (VOP) v1.1. ART v1.1 enables participants to execute and validate both previously available test cases and new test cases introduced as part of the v1.1 release. The toolbox is designed to support testing and validation activities across the payments ecosystem. The EPC has made available comprehensive resources to assist users, including the ART User Guide, a list of test cases, video tutorials, and example files accessible through the toolbox's frequently asked questions section. Technical support is available through the dedicated ART Support Desk at [email protected]. The EPC encourages all participants to utilise the ART platform to facilitate their testing and validation processes. The toolbox can be accessed at https://toolbox.epc-cep.eu/. This release represents a key infrastructure development for payment service providers and other market participants implementing VOP v1.1 standards within the European payments landscape.