This class provides a light wrapper around several PayPal operations including
creating a URL to redirect to PayPal, and a PostBack implementations for
IPN notifications.

PayPal operation differs significantly from the other Credit Card processing classes in this group, since PayPal is not a straight transactional interface, but requires going through PayPal's Web interface. This class only provides a few helper methods to facilitate this process, but additional code is required to hook this logic into the Web application flow.

For more information see How PayPal Integration works.

What do you need:

• Bank Account
  
• Set up a PayPal account
  
• Hook up in the Web Store is automatic. For other
  apps you'll need to hook PayPal Redirection and return
  processing into your order flow.