Google account without a physical address?

[CormorantDevouringTime]

DD (15) has an android phone and hence a Google account.

For the first time she wants to buy a paid-for app, a legitimately educational thing.

I've got her a Google Play scratch card voucher but apparently she can't put it onto her account without adding a physical address to her account which she doesn't want to do because a lifetime spent on the interwebs has left her a bit paranoid about privacy etc.

So what's best?
A) get over it, those nice people at Google wouldn't do anything bad with your address
B) look harder, there is a clever way to use a Google payments account without an address
C) say she lives at Broadcasting House W1A 1AA or similar fake address

You need to have a card attached to it and that needs a billing address

Add a card with valid payment address
Use voucher
Delete card

I think its cute that she thinks Google doesn't know where she lives, and the last ten things she bought and who her friends are...