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

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

var res = await sdk.Playlists.GetPlaylistAsync(playlistID: 4109.48D);

// handle response

{
  "MediaContainer": {
    "size": 1,
    "Metadata": [
      {
        "content": "library://x/directory/%2Flibrary%2Fsections%2F1%2Fall%3Ftype%3D1%26push%3D1%26title%3D2%26or%3D1%26title%3DSerenity%26pop%3D1",
        "ratingKey": "95",
        "key": "/playlists/95/items",
        "guid": "com.plexapp.agents.none://87425529-380f-44b8-a689-9a0537e7ec91",
        "type": "playlist",
        "title": "Smart Movie Playlist",
        "summary": "",
        "smart": true,
        "playlistType": "video",
        "composite": "/playlists/95/composite/1705717387",
        "icon": "playlist://image.smart",
        "duration": 282000,
        "leafCount": 2,
        "addedAt": 1705716493,
        "updatedAt": 1705717387
      }
    ]
  }
}