In its PSD2 PKI policy paper, the BSI has issued support for banks that offer accounts and third-party providers of financial services in planning guidelines for implementing the account interface for third-party service providers (XS2A) that is required by PSD2.

Proposal for a Policy for the compliance of a qualified trust service provider with PSD2-specific requirements, PSD2-specific requirements defined by PSD2 and EBA RTS - Draft