This will allow you to use CCBill as a payment option in your OpenCart store. To install, you just unzip the files into the root directory of your OpenCart installation. There are detailed instructions included that will walk you through setting up this module. There is also contact information for CCBill if you have any CCBill related questions.
I’ve tested this on version 1.5+ including the newest version released in March. It may work with older versions but not guaranteed.