Implementing IAP

Implementing IAP
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I was following

He said to add the following line in Appdelegate.m at the beginning of application:didFinishLaunchingWithOptions:

[RageIAPHelper sharedInstance];

Where should I add this line in cocos2dx project?

And one more question should I need to implement these functions or they are just the part of GUI covered in this tutorial?

- (void)viewWillAppear:(BOOL)animated {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(productPurchased:) name:IAPHelperProductPurchasedNotification object:nil];

- (void)viewWillDisappear:(BOOL)animated {
    [[NSNotificationCenter defaultCenter] removeObserver:self];

- (void)productPurchased:(NSNotification *)notification {

    NSString * productIdentifier = notification.object;
    [_products enumerateObjectsUsingBlock:^(SKProduct * product, NSUInteger idx, BOOL *stop) {
        if ([product.productIdentifier isEqualToString:productIdentifier]) {
            [self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:idx inSection:0]] withRowAnimation:UITableViewRowAnimationFade];
            *stop = YES;