When implementing any part of the Standard (API specifications, security profiles, customer experience and operational guidelines), ASPSPs implement mandatory endpoints and functions, conditional ones where required for regulatory compliance, process mandatory and conditional fields and return meaningful values, document on their developer portals which conditional and optional elements they support, and explain any divergence from mandatory or conditional elements to their national competent authority when seeking an exemption.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.