Just checked the refunds policy page and realised there was this clause in it: "IF A PURCHASED SET OF COINS IS NOT EXCHANGED INTO THE VIRTUAL ITEMS DURING 30 CALENDAR DAYS IT THEN IS NO LONGER VALID AND CANNOT BE A SUBJECT OF REFUND".
Does this mean if I donate 100 coins today and don't buy anything with it then after 30 days I will not be able to use them anymore?
Coins don't expire or disappear. That text is there for legal reasons. I assume it means that if something happens, they would be legally responsible only for coins purchased in last 30 days.