curl --request GET \
  --url https://openapi.pluuug.com/v1/todo/{todo_id} \
  --header 'X-API-Key: <api-key>' \
  --header 'X-Signature: <api-key>'

{
  "id": 123,
  "inquiry": {
    "id": 123,
    "name": "<string>"
  },
  "type": "M",
  "dueDate": "2023-12-25",
  "action": "<string>",
  "dDay": 123,
  "created": "2023-11-07T05:31:56Z",
  "inCharge": {
    "id": 123,
    "nickname": "<string>",
    "email": "<string>",
    "isActive": true,
    "grade": {
      "id": 123,
      "title": "<string>"
    }
  },
  "completedInCharge": {
    "id": 123,
    "nickname": "<string>",
    "email": "<string>",
    "isActive": true,
    "grade": {
      "id": 123,
      "title": "<string>"
    }
  },
  "dueTime": "<string>",
  "actionHistory": "<string>",
  "isComplete": true,
  "completedAt": "2023-11-07T05:31:56Z"
}