Get scheduled message

{
  "success": true,
  "data": {
    "id": "string",
    "waMessageKey": {
      "fromMe": true,
      "remote": "string",
      "id": "string",
      "_serialized": "string",
      "participant": "string"
    },
    "to": "string",
    "type": "text",
    "text": "string",
    "mediaUrl": "string",
    "mediaKind": "image",
    "pollQuestion": "string",
    "pollOptions": [
      "string"
    ],
    "pollAllowMultiple": true,
    "status": "pending",
    "sendAt": "2019-08-24T14:15:22Z",
    "createdAt": "2019-08-24T14:15:22Z",
    "confirmedAt": "2019-08-24T14:15:22Z",
    "receivedAt": "2019-08-24T14:15:22Z",
    "readAt": "2019-08-24T14:15:22Z",
    "playedAt": "2019-08-24T14:15:22Z",
    "failedAt": "2019-08-24T14:15:22Z",
    "failureReason": "string",
    "secret": "string",
    "linkPreview": {
      "title": "string",
      "description": "string",
      "canonicalUrl": "string",
      "thumbnail": "string"
    }
  }
}

{
  "success": false,
  "error": {
    "code": "string",
    "message": "string",
    "requestId": "string",
    "details": [
      {
        "path": "string",
        "code": "string",
        "message": "string"
      }
    ]
  }
}