The Revised Payment Services Directive (PSD2) goes into effect in January 2018. This new set of regulations drives signiﬁcant changes in the banking and payment technology industries. While much of PSD2 concerns the operational aspects of monetary transfers, there are also speciﬁc technical requirements. Notably, the companion document Regulatory Technical Standards (RTS) on Strong Customer Authentication and Secure Communication requires that banks allow third-party technology providers access to their systems through a secure, designated communications interface. The speciﬁc provisions of this RTS are effective as of November 2018.