Hi,

I've searched and found some other threads about this, but can't find a clear answer to resolve it. I have Authorize.net AIM installed and configured properly, using the hash setting as well, I have SSL & cURL installed on the server. When I try to process a transaction (in test or production mode) I get the following errors:
WARNING: Security hash problem. Please contact store-owner immediately. Your order has *not* been fully authorized.

This transaction cannot be accepted. - Your credit card could not be authorized for this reason. Please correct the information and try again or contact us for further assistance.
I've talked to Authorize.net support on two occasions about this, neither person was able to help me.

Any help or direction would be great. Thanks!