Yes. NuORDER supports payments with international credit cards. Foreign exchange fees are applicable when using an international credit card to transact in a non-local currency. This is charged by the credit card and merchant services provider.
For example, you may use a Canadian credit card to place an order in USD. The order will be in USD, the funds deposited to the bank account will be in USD, and the credit card holder will see the charge in CAD on their credit card statement.