Shopify/active_merchant — pull request #308 by dscataglini (2012-03-19 23:52:44+00:00)
Title: Added PayPal recurring payment api

I took @ginettev code from https://github.com/Shopify/active_merchant/pull/246 as a starting point made a module out of it, added a few needed tests & fixed a bug.
With this pull adding recurring payment api to PaypalExpressGateway should be just a matter of including PaypalRecurringApi.