Shopify/active_merchant — pull request #235 by brentmc79 (2011-12-06 21:09:18+00:00)
Title: Resolves issue #234 with the Quickpay gateway

-Including testmode=1 for recurring message types causes a
checksum failure
-Recurring message types include a transaction id
-The testmode is determined from that reference transaction
-Omit the testmode parameter for recurring message types

resolves Shopify/active_merchant#234