title: Youtube API v3 shows "Access Not Configured"
body: <p>I created a Google application in the developers console, turned on "YouTube Data API v3", generated the server API key, and authorized my home and work IPs.</p>
  
  <p>My website lists all videos from a Youtube channel, using the V3 API. It uses the <a href="https://github.com/google/google-api-php-client" rel="noreferrer" title="official Google PHP library on Github">official PHP library</a>, passing it the server API key.</p>
  
  <p>It all worked well yesterday from home, and today morning from work. <strong>Then, it suddently stoped working</strong> at 11am (GMT+1), with no action from my part, with this error:</p>
  
  <blockquote>
    <p>[Google_Service_Exception] Error calling GET
    <a href="https://www.googleapis.com/youtube/v3/channels?part=contentDetails&amp;forUsername=xxxxxxxxxx&amp;key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" rel="noreferrer">https://www.googleapis.com/youtube/v3/channels?part=contentDetails&amp;forUsername=xxxxxxxxxx&amp;key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx</a>:
    (403) Access Not Configured. The API is not enabled for your project,
    or there is a per-IP or per-Referer restriction configured on your
    APIkey and the request does not match these restrictions. Please use
    the Google Developers Console to update your configuration.</p>
  </blockquote>
  
  <p><em>Note: i used less than 10 requests, out of the 50 millions allowed by day, i have a static public IP address, this part of the code was untouched.</em></p>
  
  <p>What can i look for in order to fix that, please? I really don't know where to head for from now... Thank you.</p>