title: Read data from Youtube Analytics API without Oauth2
body: <p>I am currently writing a python script to pull information from YouTube Analytics API for a list of separate YouTube channels. The output would be, for example, count video views for each YouTube channel in last month.</p>
  
  <p>My initial idea was to ask each of the YouTube account owners to create a YouTube Analytics app in their console.cloud.google, create a Project, enable the youTube Analytics API, generate an API key and specify that it is needed for the YouTube Analytics API. </p>
  
  <p>I'm testing with one account and if I try to run the script using the API Key generated with the process described above and authenticating like this:</p>
  
  <pre><code>def get_service():
      return build('youtubeAnalytics', 'v2', developerKey=API_KEY)
  </code></pre>
  
  <p>it fails with a <code>HttpError 401 Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.</code> </p>
  
  <p>I am not sure if I have done something wrong in creating the API key, or if instead the YouTube Analytics API <em>requires</em> Oauth2 authentication. If the latter is the case, then I am surprised that google console lets you to go all the way and generate API keys and specify that they are needed for the YouTube Analytics API, only for you to find out that you can't use it.</p>
  
  <p>So my question is: do I have to use Oauth2 for YouTube Analytics API or can I use the API key? I'm trying to read data from "my own" account, so why do I need to manually authorise my own app?</p>