Our shop ships only to US and Canada. We currently have Four shipping modules installed: flat rate, flat rate Canada (clone of flat rate), Free Shipping and UPS. flat rate Canada was added just before our problems started showing up...
We use Authorize.net (AIM) to process orders.
Since adding Flat Rate Canada, Canadian customers can no longer checkout of our shop. It gives them an authorization error and they can't check out.
Can anyone point me in the right direction on this??? My client is about to FIRE me!!!![]()





