Gift Up! supports any currency and any country. However, you are required to connect a payment account to Gift Up! so you can accept payments for the gift cards you sell. This is one of 3 currently: Stripe, Square & PayPal and each provider has different limitations on which countries they support.
PayPal are available in more than 200 countries/regions and support 25 currencies: https://www.paypal.com/uk/webapps/mpp/country-worldwide
Stripe support over 30 countries: https://stripe.com/global
Square support 5 countries at the moment: UK, US, Canada, New Zealand and Japan.
What currencies can my customers pay in?
We integrate with our payment providers and so we support every currency which our payment providers offer.
See our article about supporting multiple currencies here.