You can use Paypal to make a one time payment on our website with your credit card. As a small convention, we can't afford, nor want the responsibility of securing credit card information on our website. Paypal is a reputable company with 10+ years of doing what they do safely and securely.
You don't need a Paypal account to use Paypal though. When you get to the Paypal log in screen, there is a link on the right side of the page that says "Don't have a Paypal account." When you click that, it has two options, registering a new account or making a one time payment with Paypal without setting up an account. This second option is like going into Kroger or any store and swiping your credit card. They could be using any number of credit card processors, Verisign, FirstUSA, etc. but you don't have to worry about that.
Paypal works the same way, it is just they also have a system in place on the internet that allows you to create an account to save your credit information so that any time you need to pay with Paypal on any website, it is quick and easy.