Using PayPal with AppEngine (Python)

I'm looking to use Google开发者_开发问答 AppEngine (Python). The Tipfy framework looks very good. How do I add PayPal and/or Google Web Payments into my app.

Is there a simple extension or similar that I can drop in?

Here's the blog entry where they introduce the PayPal X toolkit for GAE/J:

Wednesday, June 30, 2010 PayPal introduces PayPal X Platform Toolkit for Google App Engine http://googleappengine.blogspot.com/2010/06/paypal-introduces-paypal-x-platform.html

In that article it says that they are working on the Python version.

If you have the flexibility you could wait for this official support, otherwise check one of the older stackoverflow topics on this issue where they discuss unofficial solutions.