One of the new rules introduced by the PSD2 is mandatory transaction monitoring. As defined in the Regulatory Technical Standards (RTS) on Strong Customer Authentication (SCA) and Common and Secure Communication (CSC), transaction monitoring will become mandatory for all payment services providers.
The revised Payment Services Directive (PSD2), which enters into application on 13 January 2018, will facilitate innovation, competition and efficiency. Read the full European Commission Fact Sheet about PSD2.