Visit the Australia Post Developer Center website: Go to the Australia Post Developer Center website using your web browser.

Sign up or log in: If you don't already have an account, sign up for a developer account on the Australia Post Developer Center. If you have an account, log in using your credentials.

Explore the available APIs: Once you're logged in, navigate to the API section or search for the Postage Assessment Calculator API specifically. Please see the below screenshot for your reference,

Create an application: In the developer portal, create a new application. This step is usually required to generate an API key for accessing the desired API. Provide the necessary information as requested, which may include your application name, purpose, and any additional details. Please see the below screenshots for your reference,

Obtain the API key: After creating your application, you should receive an API key on the email address associated with your application. The API key is typically displayed on your application's dashboard or in the account settings. It might be labeled as the "Postage Assessment Calculator API key" or something similar. Please see the below screenshot for your reference,

Please validate these credentials on our app to link your Australia post-PAC API key account on our app.

If you have any questions or run into any issues during the process, don’t hesitate to contact Australia Post support for assistance.