title: Firebase Cloud Messaging where to find PUBLIC VAPID KEY
body: <p>I'm implementing Push Notification for Web App via Firebase and follow this guidelines from Google</p>
  
  <p><a href="https://github.com/firebase/quickstart-js/tree/master/messaging" rel="noreferrer">https://github.com/firebase/quickstart-js/tree/master/messaging</a></p>
  
  <p>On <code>index.html</code> I see this code</p>
  
  <pre><code>    // [START get_messaging_object]
      // Retrieve Firebase Messaging object.
      const messaging = firebase.messaging();
      // [END get_messaging_object]
  
      // [START set_public_vapid_key]
      // Add the public key generated from the console here.
      messaging.usePublicVapidKey('&lt;YOUR_PUBLIC_VAPID_KEY_HERE&gt;');
      // [END set_public_vapid_key]
  </code></pre>
  
  <p>My question is "What is Vapid Key ? and Where I can find this key ?"</p>