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In order for step 4 to be successful a mutual trust is established between the microservice in the eHealth Infrastructure and the VDX endpoint. This is done by having exchanged SSL certificates during time of installation of the eHealth Infrastructure. As the VDX endpoint provides its own STS service as well as the actual REST interface, trust is established to both endpoints.
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.