http://fhir.patientsknowbest.com/operation/generate-invitation-tokens
https://www.hl7.org/fhir/STU3/operationdefinition.html
https://www.hl7.org/fhir/STU3/operations.html
name
"generate-invitation-tokens"
...
Currently only NHS, CHI and Health & Care numbers are supported. Reference: https://pkbdev.atlassian.net/wiki/spaces/api/pages/3365077531/Identifier+Systems. If an unsupported system identifier is supplied on the request then the whole request will be rejected and an error returned.
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