curl --request GET \
  --url https://api.smokeball.com/tasks/{taskId}/subtasks/{id} \
  --header 'Authorization: <api-key>' \
  --header 'x-api-key: <api-key>'

{
  "id": "<string>",
  "href": "<string>",
  "relation": "<string>",
  "method": "GET",
  "self": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "GET"
  },
  "parentTask": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "<string>"
  },
  "createdBy": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "<string>"
  },
  "completedBy": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "<string>"
  },
  "lastUpdatedBy": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "<string>"
  },
  "subject": "Confer with Mary",
  "completedDate": "2020-02-15T00:00:00Z",
  "createdDate": "2020-02-15T00:00:00Z",
  "isCompleted": false,
  "isDeleted": false,
  "lastUpdated": 637847425252027400
}