Instance.setDefaultLocale

type Instance = {
  payWithPopup: InstancePayWithPopup;
  createCardField: InstanceCreateCardField;
  revolutPay: InstanceRevolutPay;
  destroy: () => void;
};


RevolutCheckout("<token>").then(function (instance) {
  instance.setDefaultLocale('es')
  instance.payWithPopup({
    onSuccess() {
      window.alert("Gracias!");
    },
    onError(message) {
      window.alert("Oh no :(");
    }
  });
});