Adding a new shipper?

Hi Guys and gals,

Ive got a friend thats into php and has offered to write the API interface, but he’s asked me for samples of whats there already…

I was thinking to give him the Australia post shipping and all i was able to find was AUP.PHP in the shippings directory, but must be other parts where the actually shipper is setup in the software? like enabled with things like accounts to enter etc? So the software knows what to send to the couriers API? does anybody know where I can find this information?