Yes, you can contribute to a campaign outside of your country as long as the currency is accepted. However, keep in mind that you may incur extra fees from your credit card company or PayPal for international payments.
View a list of accepted currencies here.
NOTE: Not all campaigns will accept all currencies. It’s best to contact the campaign owner to ask if they are accepting your currency.
It might be a good idea to check with your credit card company or PayPal, so you aren’t shocked by your next bill. Bill shocks are no fun.