title: User email by channel ID
body: <p>Is there a way to get the email of a user having their channel ID?</p>
  <p>In this example, I am trying to get the email of the user who left a comment under a video, but there is only the channel ID.</p>
  <pre><code>&quot;authorChannelId&quot;: {
                              &quot;value&quot;: &quot;UCNLNkYTttHytlMhVXP5skhA&quot;
                         }, 
  
  </code></pre>