In HostBill currency ID depends on the order in which you've added the currencies:

• 0 - is default currency you've set
• 1,2... are next currencies

The order links:

yourhostbill.com/index.php?/cart/shared-hosting/&action=changecurr&currency=1
yourhostbill.com/index.php?/cart/promotional-specials/&action=changecurr&currency=0

To get the currency ID go to Settings → Currency & Tax Settings → Additional currencies and hover your mouse over the red Edit button. At the bottom of the page the currency ID will be displayed at the end of the URL: