Credit to the post on hukd
Confirmed to be working with an Australian registered paypal account. According to the original post:
Can I use my Starbucks Card when I travel internationally?
Starbucks Cards activated in any of the participating countries (UK, USA, Canada, Australia, Hong Kong, Mexico, and the Republic of Ireland) can be used to make purchases and be reloaded in any other participating country. Starbucks Cards must first be activated by loading money onto the card in the country of purchase before being used internationally.
So should be able to activate code at https://www.starbucks.co.uk/card and use in aus locations
For multiples:
Validated email not required (use garbage), same paypal can be used.
1) Pay for deal as new user (Scroll down)
2) Use PayPal (can be the same account)
3) Goto My Orders and note code + pin
4) Redeem at http://starbucks-groupon.cashstar.com/claim/
5) Transfer amount to your proper starbucks card if required
6) Delete NEW card if required
7) Sign out of groupon, return to deal page and goto 1) :)
Thanks bought. that makes starbucks coffee just the right price .