If you want to integrate PayPal with your Google AppEngine application, there are a limited number of options available. My own open source project offers a servlet that can parse and log IPN messages. This will quickly get you up and running with PayPal Payments Standard.
Since I launched the PayPal servlet, I’ve had many inquiries and I know of at least 2 production deployments of the code. It was about time that I started handling the project a little more professionally.
The first step in this process was completed last weekend: the project is now a Maven project and the Eclipse specific configuration has been removed. I have decided to make this part of my Powered by Reindeer initiative. Although it can be used completely independent and will remain so, I believe that there are going to be some nice synergies in the future that I’ll want to exploit.
My next step will be cleaning up the actual code. I’m not sure when I’ll get around to it, but this will involve changing the package names a little to be more in line with the Powered by Reindeer structure. If you think there’s a good reason to keep the old names, please let me know. Also let me know if you’d like to get a personal e-mail when the changes will take place.