Thanks for trying to donate to our project.
The conversion happens automatically. Your card will get changed AUD equivalent of USD amount you choose.
I am in Australia. I tried to donate AUSTRALIAN dollar 9. Despite selecting "country" as "Australia", the currency stubbornly remained US Dollar. I do not have US Dollar. I am not going to buy US dollars and all that hassle. I want to donate 9 Australian dollar using my Australian dollar denominated VISA credit card without paypal and all that. Please can you fix your bug and then email me.