Shopify has now integrated with the Canadian payment gateway E-xact.
From the E-xact Transactions website:
E-xact is a leading provider of fast, secure and accountable online transaction solutions. Since 1998, we’ve been at the forefront of the emerging world of online exchange, with solid and secure transaction processing systems and superb customer service.
Special thanks to James Edward Gray II who contributed the code for this gateway to ActiveMerchant.