Shopify/active_merchant — pull request #1128 by markabe (2014-04-18 13:17:40+00:00)
Title: BridgePay: Switch method of success detection.

In test the 'Message' field returned APPROVAL for success but in production it was
'AUTH/TKT 02992G'. It appears that checking the RespMSG field will be a
better choice.