title: which method is used to register the device token for push notification?
body: <p>I am able to get the deviceToken in the below method, now I want to know how to register the deviceToken for push notification,because I am not sure after getting the device token which method or API is used to register the device token for Push Notification and how this registration process works?</p>
  
  <pre><code>- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
      NSLog(@"APN device token: %@", deviceToken);
  }
  </code></pre>