title: Add (end-)cards to a Youtube video using the Youtube Data API V3
body: <p>is it currently possible to add cards and endcards to a youtube video using the Youtube Data API V3?</p>
  
  <p>I know it wasn't able to add the oldschool annotations to a video using an API, a developer answered that there won't be any option to do so and those are deprecated now anyways.</p>
  
  <p>There are the invideoPromotion(also deprecated according to the API documentation) features present in the API, but due to the lack of information I am not entirely sure what I can achieve with that.
  (<a href="https://developers.google.com/youtube/v3/docs/channels#resource" rel="nofollow noreferrer">https://developers.google.com/youtube/v3/docs/channels#resource</a>)</p>
  
  <p>Do I have to update a channel just so I can add some annotations to one single video?</p>
  
  <p>Is it even possible to add proper annotations to a video or can i only add the watermark?</p>
  
  <p>I've searched for hours on end, without finding a definitive answer or an example of how I am supposed to add annotations to a video.</p>
  
  <p>I use a Go-server to upload Videos and thumbnails for my clients and would love a feature where they don't have to insert the annotations by hand after the video is uploaded.</p>