Joomla Virtuemart Shipment Plugin for the Australia Post Postage Assessment Calculator v1.3 and 1.4.
Employs the AusPost Postage Assessment Calculation API - Tested in PAC 1.3 and PAC 1.4 (latest at 21/04/2013).
Supports: Domestic|International, Parcel|Letter, Regular|Express, Registered, Confirmed, and Insured Post.
For multiple cart products: Calculates parcel sizes and splits into multiple parcels where required as per AuPost parcel limits.
Tested in Joomla 2.5 with VirtueMart 2.0 and Joomla 3.x with Virtuemart 3 :)
The AusPost PAC spec was impressive also and is available via the AusPost Developer Center.
To configure: First enable the plugin in "Administrator -> Extensions -> Plugin Manager", then add a new shipment method in "Administrator -> Components -> Virtuemart -> Shop -> Shipment Methods".
Further instructions at: http://shop.ekerner.com//plugins/vmshipment/auspostpac1/auspostpac1_manual.php (AusPostPAC1 Manual).
Developed by eKerner.com.au - Technical Solutions