Thank you for reaching out to the community!
We apologize for any inconvenience, AUD is not currently an accepted currency for Constant Contact services. Below are the currency types that we can accept at this time.
While in Trial, click the "Change Currency" link if you need to make a switch.
For more information please visit this FAQ page.
I hope that this was helpful!
Please let us know if there is anything else we can do for you.