How Do I Set Up The Australia Post App?

Export Orders in the Australia Post eParcel CSV Format with the Australia Post export App. 

In the eParcel portal you need to configure Administration --> Merchant Location Details --> and set the CSV import file format to use the New Consignment CSV Import File Format.
AUS_POST_CSV_Settings
And the charge code that you should use when exporting from Commerce7 can be found under --> Administration --> Contract Information --> price schedule. The code should be four digits like 9876.
Aus_post_charge_code

To set up/enable the Australia Post export app follow these steps:

Install the app in the admin panel under Apps>Australia Post

australia-post

australia-post-1

When ready to use the export, filter the orders you want to export under Store>Orders.

Click the Australia Post export button.

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