title: 'Purchase currency not supported' when using in app billing and a test user account in google play
body: <p>I'm using a test google checkout account I created using a credit card number from here: <a href="https://developers.google.com/checkout/developer/Google_Checkout_Basic_HTML_Sandbox" rel="nofollow noreferrer">https://developers.google.com/checkout/developer/Google_Checkout_Basic_HTML_Sandbox</a></p>
  
  <p>When I try to buy something in app from an unpublished app (the item itself is published) using the test account it requests I add a credit card, if I go to the drop down to select an existing card it shows the card from the aforementioned link I had added but says 'purchase currency is not supported'.</p>