Shopify/active_merchant — pull request #795 by duff (2013-08-09 20:03:26+00:00)
Title: MerchantWarrior: Make received amounts in cents

The gateways can take in a Money or an integer in cents. Then under the
covers it sends the amount in the right format to the actual gateway.

The Merchant Warrior gateway class was taking in a string dollar amount
rather than behaving like the other gateways.