curl --request GET \
  --url https://{host}/api/v3/sickLeaveCertificates/{id} \
  --header 'Authorization: <authorization>'

{
  "data": {
    "id": 123,
    "leavePeriodId": 123,
    "leaveAccountId": 123,
    "authorId": 123,
    "creationDate": "2023-11-07T05:31:56Z",
    "isActive": true,
    "cancellationDate": "2023-11-07T05:31:56Z",
    "cancellationUserId": 123,
    "subrogation": true,
    "subrogationStartDate": "2023-11-07T05:31:56Z",
    "subrogationEndDate": "<string>",
    "lastWorkingDay": "2023-11-07T05:31:56Z",
    "numberOfWaitingPeriodDays": 1,
    "numberOfCompensatedDays": 1,
    "partTimeNature": 0,
    "partTimeActivityRate": 123,
    "partTimeReturnType": 0,
    "earlyReturn": true,
    "extension": true,
    "comments": "<string>",
    "originalLeavePeriodId": 123,
    "accidentDate": "<string>",
    "accidentPlace": 0,
    "firstObservationDate": "2023-11-07T05:31:56Z",
    "childArrivalScheduledDate": "<string>",
    "childArrivalEffectiveDate": "<string>",
    "childArrivalType": 0,
    "isSingleChild": true,
    "childAdoptionDistribution": 0,
    "paternityLeavePartType": 0,
    "compensationRate": 123,
    "longLastingAffection": true
  }
}