You can set up and manage payment gateways for your site from the Payment Settings screen. (Administration > Advanced Settings > Developer Configurations > Payment Settings).
The currency shown on the front-end of the site is based on whatever is in the Currency Symbol field, but many shipping providers need the ISO code as well to process requests in the correct currency.
You should generally only need to use the Currency Symbol field in the Admin Site Settings to override config settings, but will need to fill in the Currency ISO Code field.
It is imperative to have ISO code match the symbol (either through the culture setting in web.config or from symbol in site setting, if overridden); otherwise shipping calculations may be wrong.
If the field is not filled in, use the ISO Letter Code for the appropriate currency as well as placing the proper currency symbol in the next field. ISO Codes can be found at http://www.currency-iso.org/iso_index/iso_tables/iso_tables_a1.htm.
Currency |
Currency Code |
---|---|
US Dollars |
USD |
Canadian Dollars |
CAD |
UK Pounds |
GBP |
Euros |
EUR |
Indian Rupee |
INR |
You should also make sure you have chosen the appropriate payment gateway on the front end from the Admin UI. Go to Administration > Store Settings > Payment Methods.