The 3DS SDK is developed in line with EMVCo's SDK Specification and its APIs, provides the data the AReq needs and the challenge UI and messaging; for the challenge it verifies the JWS signature carried as ACS Signed Content in the ARes with the DS's pre-installed public key, and generates JWE objects for CReq messages using keys derived from its own ephemeral key together with the ACS's ephemeral key.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.