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Looks like it’s US-only.

I haven’t been able to find a service like this that supports Australian users, so looking for suggestions!

wise also offer virtual cards, which works in NZ, possibly in Aussie too? https://wise.com/nz/virtual-card/

I'm in NZ, but I can use https://statescard.com/ and they seem to be pretty good.

I use this for signing up to watch HBO Max and some other subscriptions. It's pretty handy.