Code as following - this code worked yesterday are providing invalid ID's now longer works, i've been though code about 10 times
.m
 #import <UIKit/UIKit.h>
 #import <StoreKit/StoreKit.h>
@interface InAppViewController : UIViewController  <SKProductsRequestDelegate, SKPaymentTransactionObserver> {
    SKProduct *proUpgradeProduct;
    SKProductsRequest *productsRequest;
}
.h
#import "InAppViewController.h"
@implementation InAppViewController
- (void)viewDidLoad{
    [self requestProUpgradeProductData];
}
- (void)dealloc {
    [super dealloc];
}
- (void)requestProUpgradeProductData
{
    NSLog(@"called  productsRequest");
    NSSet *productIdentifiers = [NSSet setWithObject:@"com.okz8.investor.gem15" ];
    productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
    productsRequest.delegate = self;
    [productsRequest start];
    // we will release the request object in the delegate callback
}
#pragma mark -
#pragma mark SKProductsRequestDelegate methods
- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
    NSArray *products = response.products;
    proUpgradeProduct = [products count] == 1 ? [[products firstObject] retain] : nil;
    if (proUpgradeProduct)
    {
        NSLog(@"Product title: %@" , proUpgradeProduct.localizedTitle);
        NSLog(@"Product description: %@" , proUpgradeProduct.localizedDescription);
        NSLog(@"Product price: %@" , proUpgradeProduct.price);
        NSLog(@"Product id: %@" , proUpgradeProduct.productIdentifier);
    }
    for (NSString *invalidProductId in response.invalidProductIdentifiers)
    {
        NSLog(@"Invalid product id: %@" , invalidProductId);
    }
    // finally release the reqest we alloc/init’ed in requestProUpgradeProductData
    [productsRequest release];
    //[[NSNotificationCenter defaultCenter] postNotificationName:kInAppPurchaseManagerProductsFetchedNotification object:self userInfo:nil];
}
This just does not return response i've done all here http://troybrant.net/blog/2010/01/invalid-product-ids/
Was getting invalid ID's now i dont get anything
Had the same problem and found the solution here: productsRequest response method is not calling
Due to automatic reference counting my request was immediately deleted again...
Based on user178379 response, Try to implement this method:
- (void)request:(SKRequest *)request didFailWithError:(NSError *)error {
    NSLog(@"request - didFailWithError: %@", [[error userInfo] objectForKey:@"NSLocalizedDescription"]);
}
My problem was: Cannot connect to iTunes Store, which was for: 
StoreKit (In-App purchases) will not work in the Simulator. 13962338
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