If you’ve spent more than a few minutes in the PayPal documentation, you will have realised it’s easier to manually decrypt a 1024 bit RSA private key than to understand the PayPal’s API for Digital Goods with Express Checkout.

Fortunately, I put in 104 hours of human computing cycles, funnelled the knowledge into an easy-to-use PHP library and am now in the process of publishing human friendly documentation on how to use this library (and the Digital Goods product) on this site.

It’s a work in progress, so checkout a few of the draft articles and check back soon for more.