I have downloaded FotoPlayer because I wish to sell my images using PayPal. Two thirds of my visitors are from the States and it seems far more sensible to offer images rather than prints.
I have created my album and configured the shopping cart to the best of my ability but when I use PayPal's Sandbox to test the cart I have problems. The buyer can select the image/s and pay using PayPal. The transaction is accepted and then the buyer is told that he/she is returning to the merchant's site (to be able to download the image/s), but that doesn't happen. The prog. paypalreturn.php starts up and then this is followed by an error report stating, “Validation failed. Possible reasons: Unauthorized access, page has expired or payment not yet credited to paypal account.”
I have tried all options open that I can see without success and the author has not been able to sort my problem.
The problem I had turned out to be with the Paypal sandbox. Dhina resolved the problem for me, tested my configuration and I used his sandbox facility to test it for myself. 2 out of 10 for Paypal but 10 out of 10 for Dhina.