Stripe hosted another 'Capture the Flag' (CTF) event. They previously did one back in February 2012 which contained 6 flags - however they were back with the 'web edition' going from level 0 to level 8 covering a range of web attacks. This is how I did it.
Please note: The event is now over. If you wish to do this yourself, you will have to download the code and do it offline.