If you are using PayPal with the shopping cart, you must change your settings inside of PayPal!
Log in at your Paypal account and go to:
"Profile (under My Account)", then choose
"Website Payment Preferences".
Set "auto return" to ON, and use the return url for the ssl:
https://wahmproductions.com/~cpanelname/checkout_process.php
Replace cpanelname with the username for your cpanel. The url above is the shared ssl (secure certificate) that your website uses. You could also use this url:
http://yourdomain.com/checkout_process.php
There is an option to require users to be registered with PayPal. That is optional, but if you ever notice paypal payments that don't have matching orders, this is the reason why. It doesn't happen with everyone and there is a fix. If this happens to you, you will need to install the PayPal IPN add-on from oscommerce. If you need help installing it, please let me know and I will install it for you.