Shopify/active_merchant — pull request #843 by duff (2013-09-17 18:28:43+00:00)
Title: Moneris: Allow CVV to be optionally passed

Only certain account types at Moneris allow a verification_value to be
specified. By default, we don't pass it.

If you have an account that allows the verification_value, you can
specify that when you instantiate the gateway.

Thanks to @jduff and @melari for pointing out how the different
Moneris account types require different behavior.