If your buyer’s currency is not supported by PayPal & Stripe, their charge will be converted into your marketplace’s default currency by their bank and buyers will be charged an additional fee by their bank.
The list of supported currencies differs with countries and can be viewed from the link below.
Stripe: https://support.stripe.com/questions/which-currencies-does-stripe-support#currencygroup2
PayPal: https://developer.paypal.com/docs/classic/api/currency_codes/#creditcard
Omise: https://www.omise.co/which-currency-does-omise-support