(3)In the interest of legal certainty and for the avoidance of discrimination between NB-PSPs on grounds of location of establishment, the Eurosystem central banks should take a uniform approach regarding access by NB-PSPs to all Eurosystem central bank operated payment systems and central bank accounts. The Eurosystem central banks should thus apply a set of non-discriminatory, objective and risk-based criteria for permitting direct access by NB-PSPs to such Eurosystem central bank operated payment systems. This would ensure that direct access by NB-PSPs promotes market integrity and supports competition and innovation in the payment services ecosystem, without posing risks to the resilience, integrity and security of payment systems and thus without becoming a source of systemic risk.