sailthru/sailthru-ruby-client — pull request #27 by TheTrendyCyborg (2013-07-15 16:42:46+00:00)
Title: Added method to verify optout requests

It seemed this method from the API was missing.

See https://github.com/sailthru/sailthru-php5-client/blob/master/sailthru/Sailthru_Client.php#L798-821 for reference