You can set a single currency for ticketing through Settings > Payment & Orders. You must set your currency before the first ticket is purchased; you will not be able to change it after.
Supported Currencies & Payment Types
Diobox currently supports 10 currencies by way of Stripe:
AUD - Australian Dollar (A$)
CAD - Canadian Dollar (C$)
CHF - Swiss Franc (CHF)
EUR - Euro (€)
GBP - British Pound (£)
HKD - Hong Kong Dollar (HK$)
ILS - Israeli New Sheqel (₪)
INR - Indian Rupee (₹)
MXN - Mexican Peso (MEX$)
NZD - New Zealand Dollar (NZ$)
USD - United States Dollar (US$)