I have osCommerce 2.3.1. Installed PayPal Payflow Gateway from the PayPal website. The instructions say to setup the hosting account confirmation page return url method to link, but only post and get are available. The I-frame for the credit cards show but when it's processed, we receive PayPal payment but no order is processed and the customer's shopping cart is still full.
I have tried to install fresh installs. Still didn't work either. PayPal instructions say to use (mywebsite/checkout_process.php), which I did. That page shows in the I-frame when the order is done, but doesn't link to a new window. If, at that time, I manually type in (mywebsite/checkout_process.php), it does process the order, but doesn't seem very convenient as some orders may or may not process depending on if the customer would or would not think they're done when the payment is done.
I have installed our webpages, osCommerce, add-ons, modules, etc., but am limited to .php coding. Thanks for any help.