For my work at Liones I am writing a technical design for a shopping cart. The requirements are fairly basic, except for one: the shopping cart must be generic to support any payment service provider (psp) and customer relationship management (CRM) system. Also there might be several different product types in the future, like: subscriptions, downloads, pay per use, etc.. These requirements make the shop very complex and a great challenge.

I started with an investigation on the internet about this subject and I quickly found out that there aren’t much articles on this topic around, but I found a few very interesting ones though. Next I started to draw some UML diagrams; I added some best practices like the Money class.

Read the rest of this entry »