title: Google Maps shows "For development purposes only"
body: <p>Google Maps show the message "For development purposes only" when I try to show it in my webpage:</p>
  
  <p><a href="https://i.stack.imgur.com/maCMs.png" rel="noreferrer"><img src="https://i.stack.imgur.com/maCMs.png" alt="enter image description here"></a></p>
  
  <p>How could I make this message go away?</p>
  
  <p>My code is like that:</p>
  
  <pre><code>&lt;script src="https://maps.googleapis.com/maps/api/js?v=3.exp&amp;sensor=false"&gt;&lt;/script&gt;
  &lt;script type="text/javascript"&gt;
    function initialize() {  
      var myLatlng = new google.maps.LatLng(50.5792659,8.6744471);
      var centerMap = new google.maps.LatLng(50.5792659,8.6744471);
      var div = document.getElementById('map');
    }
  &lt;/script&gt;
  </code></pre>
  
  <p>Then later I have </p>
  
  <pre><code>&lt;p&gt;
    &lt;a
      href="https://www.google.com/maps/dir//50.5792659,8.6744471/@50.579266,8.674447,16z"
      target="_blank"
    &gt;Route berechnen&lt;/a&gt;
  &lt;/p&gt;
  </code></pre>
  
  <p>I don't see where this message originates from.</p>