Hi Team Australia,
We've just received intel that the registration fee for the shinsa (paid when you pass) will need to be in yen. The amounts you need are:
Shodan ¥3100
Nidan ¥4100
Sandan ¥5100
Yondan ¥6200
Godan ¥10300
Please ensure you have the correct yen amount with you before departing.