paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions is not called while restoreCompletedTransactions

Hi I need to implement the restore functionality in Inapp-Purchase, for this made a button "Restore" which is calling method

-(void)restorePurchasedProductsWithProductId:(NSString*)prodID
{
    _productIdsArray = [[NSMutableArray alloc] init];
    productID = [prodID retain];
    [[SKPaymentQueue defaultQueue] restoreCompletedTransactions];
}

It gives me a popup to enter the password of apple id.And after doing that nothing happens.

I read somewhere that it calls

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions

So i did like this

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
    NSLog(@"paymentQueue");
    for (SKPaymentTransaction *transaction in transactions)
    {
        switch (transaction.transactionState)
        {
            case SKPaymentTransactionStatePurchased:
                [self completeTransaction:transaction];
                break;
            case SKPaymentTransactionStateFailed:
                [self failedTransaction:transaction];
                break;
            case SKPaymentTransactionStateRestored:
                NSLog(@"restored");
                [self restoreTransaction:transaction];
                break;
            default:
                break;

        }
    }
}

But the problem is the above method is not calling neither this

- (void)paymentQueueRestoreCompletedTransactionsFinished:(SKPaymentQueue *)queue

nor

-(void)paymentQueue:(SKPaymentQueue *)queue restoreCompletedTransactionsFailedWithError:(NSError *)error

I have also included the required protocols,

Can some body help me why these delegate methods are not calling for restore process. I am trying it with test account.