Thanks, I've already set up the database, but PayPal is not receiving any information except the credit card info and the total price of the order. I'm trying to test with the sandbox but all I get is checkout_failure.php page appended at the bottom. I added the code to dump the session variable but there's nothing in there except the product info. No error code or any other indication coming back from PayPal. I've been trying to get this working for a week now and have had no luck. I'm I the first customer using eCart 6 with PayPal Payments Advanced? Has anyone got a site up and running with that configuration? To test in the sandbox, PayPal insists on changing the API call to use: https://pilot-payflowpro.paypal.com instead of the one coded in the ppadvframe.php file. Is that true?