You can create custom search parameter for extensions and to made SearchParameter easier to write you also can define attribute
We suggest OAuth implementation in Client Credentials Grant. You need to use “Client Credentials Grant + Access Policy”:
An example of the query that doesn't work:
It’s called an absolute reference. Aidbox doesn't work with absolute references because the logic can become very tricky since these references can point to external servers.
Use relative references instead: GET /DocumentReference?patient=Patient/1234