Get Items Children

using LukeHagar.PlexAPI.SDK;
using LukeHagar.PlexAPI.SDK.Models.Components;

var sdk = new PlexAPI(accessToken: "<YOUR_API_KEY_HERE>");

var res = await sdk.Library.GetMetadataChildrenAsync(
    ratingKey: 1539.14D,
    includeElements: "<value>"
);

// handle response

{
  "MediaContainer": {
    "size": 3,
    "allowSync": true,
    "art": "/library/metadata/30072/art/1705739923",
    "identifier": "com.plexapp.plugins.library",
    "key": "30072",
    "librarySectionID": 2,
    "librarySectionTitle": "TV Shows",
    "librarySectionUUID": "4bb2521c-8ba9-459b-aaee-8ab8bc35eabd",
    "mediaTagPrefix": "/system/bundle/media/flags/",
    "mediaTagVersion": 1701731894,
    "nocache": true,
    "parentIndex": 1,
    "parentTitle": "Reacher",
    "parentYear": 2022,
    "summary": "When retired Military Police Officer Jack Reacher is arrested for a murder he did not commit, he finds himself in the middle of a deadly conspiracy full of dirty cops, shady businessmen, and scheming politicians. With nothing but his wits, he must figure out what is happening in Margrave, Georgia.",
    "theme": "/library/metadata/30072/theme/1705739923",
    "thumb": "/library/metadata/30072/thumb/1705739923",
    "title1": "TV Shows",
    "title2": "Reacher",
    "viewGroup": "season",
    "viewMode": 65593,
    "Directory": [
      {
        "leafCount": 16,
        "thumb": "/library/metadata/30072/thumb/1705739923",
        "viewedLeafCount": 16,
        "key": "/library/metadata/30072/allLeaves",
        "title": "All episodes"
      }
    ],
    "Metadata": [
      {
        "ratingKey": "66488",
        "key": "/library/metadata/66488/children",
        "parentRatingKey": "30072",
        "guid": "plex://season/652aea6549508477c34c6000",
        "parentGuid": "plex://show/5d9c09190aaccd001f8f42f0",
        "parentStudio": "Amazon Studios",
        "type": "season",
        "title": "Season 2",
        "parentKey": "/library/metadata/30072",
        "parentTitle": "Reacher",
        "summary": "Based on\"Bad Luck and Trouble,\" when members of Reacher's old military unit start turning up dead, Reacher has just one thing on his mind-revenge.",
        "index": 2,
        "parentIndex": 1,
        "viewCount": 11,
        "lastViewedAt": 1705646565,
        "parentYear": 2022,
        "thumb": "/library/metadata/66488/thumb/1703065033",
        "art": "/library/metadata/30072/art/1705739923",
        "parentThumb": "/library/metadata/30072/thumb/1705739923",
        "parentTheme": "/library/metadata/30072/theme/1705739923",
        "leafCount": 8,
        "viewedLeafCount": 8,
        "addedAt": 1702602021,
        "updatedAt": 1703065033,
        "userRating": 9,
        "skipCount": 1,
        "lastRatedAt": 1703881224
      }
    ]
  }
}