AppDelegate.swift

func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
  // Create and Store the device token on local database and send
  // Token to backend API
  // 1:
  // remove "<" and ">" from the string
  let trimEnds = token.description.stringByTrimmingCharactersInSet(NSCharacterSet(charactersInString: "<>"))
  // 2:
  // remove spaces
  let cleanToken = trimEnds.stringByReplacingOccurrencesOfString(" ", withString: "", options: nil)
  
  //Send the cleanToken to your WebServer(network call)
}

// If the user do not allow push notifications, this method will be called
func application(application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError) {
  NSLog("Failed to get token. Error: %@", error)
}