My Authorization code is empty!

[chuyencn]

Hello friends!
I'm trying to configure Authorize payment works in VM 1.1.0 and Joomla 1.5.4, my server is hosted by Godaddy. I think everything is ok except in the email that is sent from Authorize site, the Authorization code is empty. You can see as below:

*NOTIFICATION* - An additional copy of this receipt was emailed to
Info@email.com <mailto:Info@email.com>  due to a gateway setting that was passed in at the
time this transaction was submitted.  If this e-mail address does not
belong to someone in your organization, it could indicate fraudulent
activity.

========= SECURITY STATEMENT ==========
It is not recommended that you ship product(s) or otherwise grant services
relying solely upon this e-mail receipt.

========= GENERAL INFORMATION =========

Merchant : My merchant account (597947)
Date/Time : 06-Aug-2008 07:41:52 AM

========= ORDER INFORMATION =========
Invoice : 66_f192054a7623e2535
Description : Purchase Order
Amount : 21.80 (USD)
Payment Method : Visa
Type : Authorization and Capture

============== RESULTS ==============
Response : This transaction has been approved.
Authorization Code : 000000
Transaction ID : 0
Address Verification : AVS Not Applicable



I'm very confusing with this payment method, althought the transaction was successful, but TransactionID, and AVS not applicable.


Anyone can help is appreciated.

Best regards...