PayPal Advanced Merchant Features

If you don't know anything at all about PayPal, please read What Is PayPal?, Do You Need PayPal?, and PayPal Merchant and Auction Tools. This article covers some additional advanced merchant features. Here's what you'll get:

Buy Now Buttons
This feature is very easy to use and highly customizable. If you only sell one item at a time, so you have no need for a full-blown shopping cart, use the Buy Now buttons. At this writing, these buttons are found on the Merchant Tools page, on the right, under Key Features.[Encryption is a good idea. Without it, anybody can copy off your button code and cause all kinds of mischief.]
Successful Payment URL
This option is hidden under "Add more options" in the Buy Now Buttons category, but it's one of PayPal's best features. If you sell products in electronic format, or "members only" web site access, this little option will allow your customers to go straight to your download page or get instant access to your members only page, as soon as they make their payment. It allows you to set up a turnkey system, by sending your paying customers anywhere you want them to go. If their payment was a donation, you can send them to a page that shows what their contribution is supporting. If their payment was for a subscription, this feature can take them to their subscription content. If you don't do any of these things, you can send them to a custom "thank you" page, so they know how much you appreciate their business.

PayPal is always developing new tools and features, so browse their site, occasionally, to see if you're missing anything good.