How would I go about billing my clients via PayPal? I have noticed that there are some hosts out there (ex. http://www.scionhost.com/order/signup/index.php) that have a standardized form which accepts the user name, domain name, password, and other information. I looked on the PayPal site, but I couldn't find this form or how to set it up anywhere. Could somebody please guide me in the right direction.
Login into your PayPal account and go to "Sell" tab. Look at
Single Item Purchases
These links let you create buttons to add to your site. You can also enable IPN (Instant Payment Notification) to process orders via your own script.