@implementation AppDelegate

- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Step 1: Register for user notifications
    UIUserNotificationType types= UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert;
    UIUserNotificationSettings *mySettings= [UIUserNotificationSettings settingsForTypes:types categories:nil];

    [[UIApplication sharedApplication] registerUserNotificationSettings:mySettings];
}

- (void) application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings {

    // Step 2: Register for remote notifications
    [application registerForRemoteNotifications];
}

- (void) application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {

    // Step 3: Convert the token to a string
    NSString *token= [[[deviceToken description]
                       stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]]
                      stringByReplacingOccurrencesOfString:@" " withString:@""];

    /* Step 4: This call will:
     * - Check on LSUserDefaults if a previous token has been saved
     * - Save the current token on LSUserDefaults
     * - Initialize the LSMPNDevice object with the previous and current tokens
     */
    LSMPNDevice *device= [[LSMPNDevice alloc] initWithDeviceToken:token];

    // The LSMPNDevice object is initialized and ready for use
}

- (void) application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {

    // Something went wrong
}

@end