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Mechanize
Mechanize extends the power of Nokogiri allowing you to interact with multiple pages on the site: click links, submit forms, etc.
(10 minutes)
Integrating Active Merchant
In this episode I show how to add Active Merchant's functionality to a Rails application to make a fully-functional checkout process.
(18 minutes)
PayPal Security
This episode shows how to encrypt the variables passed to PayPal and verify the authenticity of the payment notifications (IPN).
(11 minutes)
PayPal Express Checkout
PayPal Express Checkout is easy to add to an existing ordering system. See how in this episode.
(15 minutes)