Applicants may pay the fees immediately after their application is completed, or pay the fees later by clicking the "On-Line Payment" button of the registration system.
First we thought about an XML based configuration, but this seemed to be a hassle to write (and read) and also would mean we would have to pay the price of parsing it on every application startup.
Back in 1993 we had to buy and continue to pay for maintenance on everything we needed just to build our service — operating systems, compilers, web servers, application servers, databases.