To use the Australia Post Shipping and Tracking API you may have received a invitation from Australia Post and accepted the invitation, you would have then gone through the set up process.
Where can l find any information in regards to the API'S enabled for my account?
Go here: https://id.auspost.com.au/csso/customer/myaccount/details
And log into your account.
Go to Business Applications > API Management > Manage Your API's
From here go to Manage your API's > Service Profile > Create new service profile