This episode shows how to encrypt the variables passed to PayPal and verify the authenticity of the payment notifications (IPN).

PayPal's IPN (Instant Payment Notification) service allows your app to get confirmation when an order is processed. In this episode I use IPN to mark a cart as purchased.

This episode is the first in a series on handling the checkout process for orders. Here we show how to complete purchases through PayPal's Website Payments Standard service.

This episode finishes up the Rails 2.2 series by showing a few miscellaneous additions that I find useful.

In this episode I show how to nest resources through routing and go into some new additions in Rails 2.2.

Internationalization is one of the biggest additions in Rails 2.2. See how the basics work in this episode.

Rails 2.2 is out! In this episode I show how to upgrade Rails and then demonstrate one of the new additions: Memoization.

How do you use jQuery with Rails? In this episode I redo episode #43 using jQuery instead of Prototype/RJS.

Want to create a Ruby Gem instead of a Rails plugin? In this episode I will walk you through creating a gem to extend Rails.

Need to add image attachments to a model? See how with paperclip in this episode.