In-app purchase verification

From now on, the developer license package comes with the same PHP script we use so you can self-host 'In-app purchase verification' if you want to.

#import "iAPVerification.h"

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {
    for (SKPaymentTransaction *transaction in transactions) {
        [iAPVerification verifyPurchase:transaction isSandbox:YES delegate:self];
    }
}

- (void)purchaseVerified:(NSDictionary *)dictionary paymentTransaction:(SKPaymentTransaction *)paymentTransaction {
    NSString *productId = [dictionary objectForKey:@"product_id"];

    if ([productId isEqualToString:@"com.powerflightapp.iap.1"]) {
        // Provide content
    }

    [[SKPaymentQueue defaultQueue] finishTransaction:paymentTransaction];
}