I have to say that the way to properly configure the component has not been easy. This happened because of many objective factors. Among them release a new version of the AEC, Joomla upgrade to version 2.5 and not a simple scheme of interaction with the payment system.
A total of debugging components on the site took more than two months. During that David took an active part in writing the payment processor and debugging. I could only test the component and send reports.
Perhaps, this stage was the most difficult. Because the remaining configuration of the system is intuitive, graphical user interface are excellent and provide great opportunities.
I would also like to note a great template design, almost no demanded changes to adapt to the design of the site. In the end I managed to do exactly the same site, which was conceived.
I am very glad that I was right to choose, and received a wonderful experience with the developer.