now i hope to have the correct forum…..

hope someone can give me any sort of info..
I am curious to know, I have been staying on and off in Buenos Aires for a couple of months and wondering if when I leave to go back to australia next tuesday can I claim the tax for my purchases made while here?
Im really clueless as to how it works…
is there a specific amount of pesos needed to be spent? do I present receipts?

Thanks in advance