macOS Mac app In-app Purchase : Invalid product ID

    //
    //  AppDelegate.h
    //
    
    #import <Cocoa/Cocoa.h>
    #import <StoreKit/StoreKit.h>
    
    
    @interface AppDelegate : NSObject <NSApplicationDelegate, SKProductsRequestDelegate, SKProductsRequestDelegate, SKPaymentTransactionObserver>
    {
        SKProduct *proUpgradeProduct;
        SKProductsRequest *productsRequest;
    }
    
    @property (assign) IBOutlet NSWindow *window;
    @end

    //
    //  AppDelegate.m
    //
    
    #import "AppDelegate.h"
    
    #define k1 @"com.mpham.TestIAP.IAP1"
    #define k2 @"IAP1"
    
    
    @implementation AppDelegate
    
    - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
    {
        if ([SKPaymentQueue canMakePayments])
        {
            [self requestIAP1];
            [self requestIAP2];
            
        }
        
    
    }
    
    
    - (void)requestIAP1
    {
        NSLog(@"requestIAP1");
        NSSet *productIdentifiers = [NSSet setWithObject:k1];
        productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
        productsRequest.delegate = self;
        [productsRequest start];
        
    }
    - (void)requestIAP2
    {
        NSLog(@"requestIAP2");
        NSSet *productIdentifiers = [NSSet setWithObject:k2];
        productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
        productsRequest.delegate = self;
        [productsRequest start];
        
    }
    
    #pragma mark SKProductsRequestDelegate methods
    
    - (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
    {
        NSArray *products = [[NSArray alloc] initWithArray:response.products];
        
        
        for(SKProduct *item in products)
        {
            NSLog(@"Product title: %@" , item.localizedTitle);
            NSLog(@"Product description: %@" , item.localizedDescription);
            NSLog(@"Product price: %@" , item.price);
            NSLog(@"Product id: %@" , item.productIdentifier);
        }
        
        for (NSString *invalidProductId in response.invalidProductIdentifiers)
        {
            NSLog(@"Invalid : %@" , invalidProductId);
        }
    }
    
    #pragma mark - PaymentQueue
    
    -(void)paymentQueue:(SKPaymentQueue *)queue removedTransactions:(NSArray *)transactions
    {
    }
    
    -(void)paymentQueue:(SKPaymentQueue *)queue restoreCompletedTransactionsFailedWithError:(NSError *)error
    {
    }
    
    -(void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
    {
    }
    
    -(void)paymentQueueRestoreCompletedTransactionsFinished:(SKPaymentQueue *)queue
    {
    }
    
    @end

    2013-02-18 16:59:14.948 TestIAP[12646:403] requestIAP1
    2013-02-18 16:59:14.951 TestIAP[12646:403] requestIAP2
    2013-02-18 16:59:15.939 TestIAP[12646:1b03] Invalid : IAP1
    2013-02-18 16:59:16.043 TestIAP[12646:1b03] Invalid : com.mpham.TestIAP.IAP1