Problem with C# OrderRefund

When running in c# the command: OrderRefund orefund = await wc.Order.Refunds.Get(2621, 1869, new Dictionary<string, string>() { });

I get the message a error has occured when deserializing the object of type WooCommerceNET.WooCommerce.v3.OrderRefund. The value cannot be parsed as a type Int32.

the refund 2621 of order 1869 exists. When replacing either value with a non existing, the command runs fine and just returns an empty object, wath is to be expected.