Customise WooCommerce Fedex Plugin for Australia

We have a Wordpress website which is running an online store using WooCommerce. The online store is in Australian Dollars (AUD) and has the base country as Australia (AU). We need to ship using Fedex and need this option available in the online store checkout. We have purchased the WooCommerce Fedex Extension here: [login to view URL] However this only supports the base country / currency as US / USD and Canada / CAD. We need it to support our store with a base country of AU and base currency of AUD. We have optained the required developer key, test account number, meter number and password from Fedex. These will be provided. The Fedex extension code as downloaded from Woo Themes will also be provided. The task is simply to modify the WooThemes Fedex extension so that it supports a base country of AU and base currency of AUD and a Origin Post Code of 3056 (Brunswick, Victoria, Australia). Once the plugin is modified appropriately we will integrate it into our site ourselves. You will not require or be given access to our site in order to perform this task. This is not necessary to modify the plugin. With the right knowledge this task should not take long at all.