I'm using GET https://www.googleapis.com/youtube/v3/playlistItems?part=contentDetails%2Csnippet&maxResults=50&playlistId=PLFs4vir_WsTwwb2zqmtE2WTEFdc7AQHnc&key={YOUR_API_KEY}
This returns all data, but only videoId in each video contentDetails. Maybe I'm missing something here?