Shopify/active_merchant — pull request #473 by frobcode (2012-10-02 20:36:40+00:00)
Title: Add First Data e4 gateway support

This attempts to support the First Data e4 gateway ; they claim to have no plans to stop supporting the old one, but this is what new users typically get. Does not support the 'void' method, due to the void operation requiring the amount.