If this is from a message that you are getting currently then it looks like you still have it in test mode. There are two places where test mode is set in PowerStore if you use Authorize.net. In the site settings is the test mode check box, make sure that this is not checked. There is also a test mode available in the payment information tab when use Authorize.net. Make sure that this box is unchecked, it looks like this is the one that is causing the issue since the site settings test mode would not produce a message from Authorize.net.