Displaying Auspost shipping rates to your customers at checkout is easy with the Auspost Pricing and Labels App.
In order to display Auspost-calculated shipping rates at checkout, you require the Advanced Shopify plan, Shopify Plus, and any Shopify annual plan. If you aren't on one of those plans, you can request Shopify to add the feature to your account. Contact Shopify Support for more details.
Step 1: Click the "Activate Australia Post Rates" Button