Setting your unique id
We recommend that all systems provide there own unique identifier for the Patient and the ServiceRequest that is submitted to the CIE Hub. This will be done by providing a value in the identifier section of the FHIR resources. This will allow the third party system to be able to query by that id.
The following is a link to the FHIR specification of this attribute that is on both records. https://www.hl7.org/fhir/datatypes.html#Identifier Please note that it is important to set the system and also the type. The system should be a uri to the client system.
The following is a example