public void OrderUpdateMerchantReference()
{
// TODO uncomment below to test the method and replace null with proper value
string id = null;
var authorization = authorizationApi.AuthorizationCreateToken("https://auth-dev.partpay.co.nz");
var createOrderRequest = CreateRequest(CreateOrderRequest.PaymentFlowEnum.Payment);
var createOrderResponse = instance.OrderCreate(authorization, "IK003", createOrderRequest);
id = createOrderResponse.OrderId;
System.Threading.Thread.Sleep(2000); // Give the system time to complete the creation of the order
var order = instance.OrderGet(authorization, id);
instance.OrderUpdateMerchantReference(order.OrderId, "new reference");
System.Threading.Thread.Sleep(2000); // Give the system time to complete the update of the order
var response = instance.OrderGet(authorization, id);
Assert.AreEqual("new reference", response.MerchantReference, "response is Updated");
}