I am setting up my game with PayVault and Facebook Credits. It seems to be working great! But I don't see how the "product_url" is used.
The definition: A url to a page where the purchase is displayed to the user, doesn't make sense to me,. I have done some test purchases that have not displayed the "product_url" page I put in. But the payment flow seems to work fine without it. I am using it on a Facebook app directly on the canvas.
Is it possible to provide a more detailed explanation of "product_url", or an example?
Thanks!
Shawn