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Whenever a client manipulates (anything but read operations) a videoappointment in the eHealth Infrastructure the microservice responsible for wrapping the VDX endpoint is invoked and communicates with the VDX endpoint. As such, it is transparent of the clients of the eHealth Infrastructure that they communcate with the actual VDX endpoint. This also means that the eHealth Infrastructure acts as a cache for the VDX endpoint which in turn means that the security model for accessing videoappointments is governed by the rules listed on Tokens, roles and RBAC/ABAC .