Shopify/active_merchant — pull request #642 by jrust (2013-04-02 17:39:18+00:00)
Title: Add an auth_reversal method for Litle which is the preferred way to reve...

...rse an authorization.

* Added certification and unit tests for auth_reversal.
* Fixed certification tests to always use a random string of length 24 which is required by the XML schema