title: In App Purchase Products that are not "Cleared For Sale" showing up in Sandbox mode
body: <p>I have some in app purchases that are not cleared for sale in iTunes Connect. </p>
  
  <p>My goal is to be able to enable and disable them after the app is launched when needed. </p>
  
  <p>However when I test in sandbox mode all of these products show up.  I had assumed that SKProductsResponse would return any invalid products in it's invalidProductIdentifiers method. </p>
  
  <p>Is this a difference between the SandBox and production modes? Will these products always show up even if they are not cleared for sale?</p>