Shopify/active_merchant — pull request #1135 by bslobodin (2014-04-23 16:41:57+00:00)
Title: Fix DataCash refund using original authorization value

@edward /cc @Shopify/payments, waiting for CI.

Original purchase transaction's response sets ``:authorization => "#{response[:datacash_reference]};#{response[:authcode]};#{response[:ca_reference]}"``, but we need only ``response[:datacash_reference]`` to execute a refund transaction, same as void or capture.