Getting API credentials to work

We are trying to integrate our WooCommerce store to the plugin “Australia Post WooCommerce Extension PRO”.

1) Unfortunately, we aren’t sure on where to get the required Business Number indicated in the plugin.
2) Also, do we use the API PASSOWRD or the Business Account password? (confusing)
3) Your knowledge base isn’t showing up to date screens for inputting information.

We have put in a business number, API and also the Password for the API (OR should this be API secret instead?)

This is the required info listed on the screen:

Account Number: Your Australia Post business account number.

API Password: Your Australia Post business account password. CONFUSING- Is it the API PASSOWRD or the Business Account password?

You can verify the credentials now by clicking on Verify. Make sure that Account Number, Password and API key are valid. Verify

API Key: You can get your own key from here, or you can keep using this one. If you have a business account with Australia Post, you must enter your own API key

Please assist.