Magento Clickbank Gateway is an extension that allows you to process your payments using ClickBank.
This extension was designed for people using Magento to sell digital goods.
ClickBank was founded in 1998 and is the online retail outlet for over 12,000 digital product vendors and their more than 100,000 active affiliates.
How it works:
User clicks “Purchase with ClickBank” button and is redirected to ClickBank payment page. Once they complete their order they are redirected back to your site. An account is automatically created for them and their user name and password is sent to them by email.