Hooking Paypal up to Ubercart isn't too bad, it's just a matter of knowing what to configure. In this Ubercart PayPal tutorial you'll learn how to create a PayPal business account and set your Ubercart store up to receive payments through PayPal.

I keep things basic and show how to use PayPal Website Payments Standard with Ubercart, as it's the easiest to set up. The standard option redirects to PayPal after checkout, so all credit card processing is done off your site.