title: iPhone StoreKit: in App Purchase: Invalid Product id
body: <p>I know this question has been asked before but I am still facing issues with the in app purchase. 
  I have read the apple document, followed the checklist of <a href="http://troybrant.net/blog/2010/01/invalid-product-ids/" rel="nofollow">http://troybrant.net/blog/2010/01/invalid-product-ids/</a></p>
  
  <p>But I am still facing problem in making the in app purchase to work. 
  I followed a video tutorial to create the StoreKit, my codes are fine. When I do NSLog for 
          NSLog(@"Invalid productRequest count %d", [response.invalidProductIdentifiers count]);
          The result: Invalid productRequest count 1
  I have submitted the binary code and rejected it. I hope this is not an issue for the IAP to work. 
  What I am doing different in order to make the in App Purchase to work. </p>
  
  <p>Can someone kindly advice me if I am making a mistake or what should I do to ensure the iap to work.</p>
  
  <p>Your response will be much appreciated. </p>
  
  <p>Thank you.</p>