This customer called and inquired if we could help with an estimate of the costs regarding their new payment service. It was a totally unique service never seen in Sweden before. We helped with sizing and design of the solution, specifically in the communications between different banks. The main problems we faced was the demand to carry through a transaction with so many parties involved in just a few seconds keeping total persistence. A sent 100 SEK must only be at one place in the system at any time.
We used well known IBM products like DB2, MQ and WAS to ensure that the system could handle these demands. The app service was a total success! Today this service is part of the every day life of 5.2 million users. That is an amazing number, considering that it is more than half the population of Sweden.