iOS In-app purchase - SKPaymentTransactionStatePurchased called all the time

[Danneman101]

I'm trying to implement an in-app purchase that unlocks a non-consumable file by setting a setting-variable to "yes".

I've set up a test user, and tried purchasing, and it seems to work.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
	if   (![[[NSUserDefaults standardUserDefaults] stringForKey:@"settings_FULL_VERSION"] isEqualToString:@"yes"])  
	{		
        if ([SKPaymentQueue canMakePayments]) {
            SKProductsRequest *productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:@"com.mysite.myapp.fullversion"]];
            productsRequest.delegate = self;
            [productsRequest start];
 
            [self purchase];
            
        } else {
            NSLog(@"Parental-controls are enabled");
        }
}

- (void)purchase 
{    
	SKPayment *payment = [SKPayment paymentWithProductIdentifier:@"com.mysite.myapp.fullversion"];
	[[SKPaymentQueue defaultQueue] addTransactionObserver:self];
	[[SKPaymentQueue defaultQueue] addPayment:payment];
}
- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {
	SKProduct *validProduct = nil;
	int count = [response.products count];
	if (count > 0) {
		validProduct = [response.products objectAtIndex:0];
	} else if (!validProduct) {
		NSLog(@"No products available");
	}
}
- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {
	for (SKPaymentTransaction *transaction in transactions) {
		switch (transaction.transactionState)   {
			case SKPaymentTransactionStatePurchasing:
				break;
		
			case SKPaymentTransactionStatePurchased:
				// Set:		settings_FULL_VERSION = YES
				[[NSUserDefaults standardUserDefaults] setObject:@"yes" forKey:@"settings_FULL_VERSION"];
				// DEBUG: 
				NSLog(@"SETTING SET TO YES");
				[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
				break;
				
			case SKPaymentTransactionStateRestored:
				[[SKPaymentQueue defaultQueue] finishTransaction:transaction];				
				break;
				
			case SKPaymentTransactionStateFailed:
				if (transaction.error.code != SKErrorPaymentCancelled) {
					NSLog(@"An error encounterd");
				}				
				[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
				break;
		}
	}
}

The problem is that even though I choose to cancel the transaction, the "settings_FULL_VERSION" is set to "yes".

In other words, the SKPaymentTransactionStatePurchased-case is always called, despite having uninstalled and reinstalled the app on my test-device, and even when having created a new product ID for the in-app purchase item.

Can anybody spot where I've gone wrong with this code?