Sinatra ruby server implementing QBWC callbacks in < 75 LOC
I've blogged extensively on QuickBooks integration in Rails on my blog Depixelate.
The short story is that working with ActionWebService sucks.
mini-qbwc is an experiment in simplicity and non-suckiness.
1) Install prerequisites
$ sudo gem install sinatra hpricot fast_xs
2) Start server
$ ruby qbwc.rb
3) Install app.qwc in QBWC and run sync