curl --request GET \
  --url https://crm.universal.rollout.com/api/appointments/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'X-Rollout-Credential-Id: <api-key>'

{
  "id": "<string>",
  "personId": "<string>",
  "userId": "<string>",
  "createdById": "<string>",
  "updatedById": "<string>",
  "appointmentOutcomeId": "<string>",
  "appointmentTypeId": "<string>",
  "invitees": [
    {
      "userId": "<string>",
      "personId": "<string>"
    }
  ],
  "title": "<string>",
  "description": "<string>",
  "location": "<string>",
  "isAllDay": true,
  "type": "<string>",
  "outcome": "<string>",
  "outcomeReason": "<string>",
  "startsAt": "<string>",
  "endsAt": "<string>",
  "created": "<string>",
  "updated": "<string>",
  "rolloutUpdated": "<string>",
  "originalIds": {},
  "original": {}
}