In order to access Australia Post zone-based settings. Please, go to WooCommerce » Settings » Shipping. Assign Australia Post to any zone you need and click on Australia Post in the zone, you will get redirected to the zone-based settings page:

• Method Title Name the shipping method. This will be visible to customers.
• Handling Fees * If you charge handling fees, you can add it from here either by adding a fixed number or a percentage (e.g. 2.5 or 2%, you can also add negative values for discount e.g. -5).
• Fallback Price * The plugin will display this price in case Australia Post service doesn’t return any prices. Leave it blank to disable the fallback price functionality.
• Domestic Options * Australia Post has three options to ship inside Australia, you can enable or disable these options as you want. (This option will appear if the shipping method was assigned to Australia).
• International Options * Australia Post has a lot of options to ship outside of Australia, you can enable or disable these options as you want. (This option will appear if the shipping method was assigned to any other country other than Australia).
• Rates * Choose to return all rates (user will get the choice) or just the cheapest rate.
• Australia Post Satchels * If you use pre-paid Australia Post satchels, you can enable the satchels you use. (This option will appear if the shipping method was assigned to Australia).
• Weight Only Shipping If you need the plugin to calculate shipping prices only based on weights. Please be cautious as this option might lead to inaccurate shipping prices.
• Delivery Time * Enable the display of delivery time for customers.
• Letters * Enable this if you ship small products that fit in letters envelopes. The letters standards are given by Australia Post.
• Domestic Letters Options * Choose the domestic options of letters that you want to offer for your customers. Please, make sure that you enabled the Letters option in order for this setting to take effect. (This option will appear if the shipping method was assigned to Australia).
• International Letters Options * Choose the international options of letters that you want to offer for your customers. Please, make sure that you enabled the Letters option in order for this setting to take effect. (This option will appear if the shipping method was assigned to any other country other than Australia).
• Signature on Delivery * If you want to charge the buyer the cost of (Signature on Delivery) service, you can enable it from this option.
• Extra Cover * Adding an extra cover to the shipments.
• Separate Extra Services* Enabling this option will separate the Extra Cover and Signature on Delivery costs. Users will be able to choose whether they want these extra services or not. In order for this to work, you also need to enable either Signature on Deliver or Extra Cover or both of them.
• Custom Boxes * Use this option if you use your own boxes, you can add an unlimited number of boxes. And the plugin will base the shipping price calculations based on the capacity of the boxes you have.