This was popular in Australia a few months ago, so I tried the link with a .co.nz at the time and it worked, signed my partner up and got her card no issues.
The Aus link has been removed but the New Zealand one hasn't, so get in quick while it's still active.
Note: Doesn't appear to work on mobile site.
The signup part gives address for only Australia. Even if you say 'My Address is not listed' it keeps the country 'Australia' which can't be changed.