public void PaymentRefund()
{
// TODO uncomment below to test the method and replace null with proper value
string id = null;
string paymentToken = null;
var authorization = authorizationApi.AuthorizationCreateToken();
paymentToken = "001.d2hsgmp251rovl7i80ise05pe8ga1h0rh8b2ri4vvqla6hbf";
var response = instance.PaymentGetByToken(paymentToken);
var refund = new Refund(response.Id, response.OriginalAmount, "Refund for Order", response.Id, "2021-01-16T00:00:00Z", response.Id);
var refundResponse = instance.PaymentRefund(response.Id, refund);
response = instance.PaymentGetByToken(paymentToken);
Assert.IsInstanceOf <Payment>(response, "response is Payment");
}