I am attempting to set up authorize.net AIM with zen-cart. The live purchases are being processed by authorize.net but zen-cart is not reading the response correctly.

The purchaser receives a confirmation e-mail of the transaction and the transaction appears in the unsettled transactions at authorize.net

Zen-cart does not record the sale or send an e-mail to the seller.

This message appears when the confirmation button is pushed:

"Your credit card could not be authorized for this reason. Please correct any information and try again or contact us for further assistance."

Zen-cart must be mis-reading the response from authorize.net

Is there a solution?