Someone remembers that! I worked at CyberCash. I was the primary author of the merchant server component (CashRegister, MCK, SMPS, whatever it was called) for a couple of years, before it got handed off to another team and I was assigned to the SET project (does anybody remember that piece of crap?). It was the first C++ app I ever wrote, and I was a college student, so I literally had the Stephens books on Unix and TCP/IP open on my desk as I worked 14 hours a day to complete the first version. They hired me full time after that and I eventually rewrote most of it to not suck as much. There was ONE version that leaked no memory, all the others were pretty much crap. Sorry about that to anyone who was using it at the time. :) It was all designed before SSL was implemented in browsers so it used real RSA crypto which was fun to work on (those parts were written by graybeards, I just did all the integration). All that stuff probably should have just been a web service / API but at the time nobody really knew how to build web apps and there was no other way to do end-to-end security, so it was all written from scratch. It was plain C++. STL was flaky and Boost didn't exist. I basically wrote a web server and a database and an asynch message processing daemon all rolled in one app that sat between the consumer wallet and the central cybercash gateway which unwrapped everything and talked to the "real" bank. Fun project!