I'm building a relatively advanced procedure which creates new orders from existing orders and finalizes them. I'm having issues figuring out how to use the API correctly. Basically the case is as following. I wan't to create one order for each customer. That order should contain all order lines with a specific property from all orders with a specific status on that customer. My method throws a null ref exception once I try to Save(). From debugging it, it looks like it has something to do with TotalPrices and/or TotalPrice(s) in PaymentInformation. TotalPrices.Count() = 0 and PaymentInformation.TotalPrice = null. I've tried using the Razor-API when adding order lines as I thought the price calculation might be automatic then. But it wasn't flexible enough for other things.

Here is the code:

            var oService =  OrderService.Instance;
            var orderLines = new List<OrderLine>();
            var currentCulture = CultureInfo.CurrentCulture;
            foreach (var cusOrder in dc.TeaCommerce_Orders.Where(x => x.DateFinalized != null && x.OrderNumber != null && x.TransactionId != null && x.OrderStatusId == 7).GroupBy(x => x.CustomerId))
            {
                //Create new order for customer (containing only subscriptions)
                var member = Member.GetMemberFromEmail(cusOrder.First().Email);
                var tcCusOrder = oService.Get(1, cusOrder.First().Id);
                var newOrder = new Order(1);

                //Set properties
                #region orderProps
                newOrder = tcCusOrder;
                newOrder.Id = Guid.NewGuid();
                newOrder.OrderStatusId = 1;
                newOrder.CopiedFromOrderId = cusOrder.First().Id;
                newOrder.CartNumber = "SUBCART-" + DateTime.Now.ToShortDateString() + "-" + member.Id;
                newOrder.OrderNumber = "SUBORDER-" + DateTime.Now.ToShortDateString() + "-" + member.Id;
                newOrder.DateCreated = DateTime.Now;
                newOrder.DateFinalized = DateTime.Now;
                newOrder.DateModified = DateTime.Now;
                newOrder.OrderLines.Clear();
                newOrder.LanguageId = tcCusOrder.LanguageId;
                newOrder.PaymentInformation.TotalPrice = null;
                newOrder.PaymentInformation.TotalPrices = null;
                newOrder.SubtotalPrice = new Price(0, tcCusOrder.VatRate, new Currency(1, "DKK", "da-DK")); ;
                newOrder.SubtotalPrices.Clear();
                newOrder.TotalPrice = new Price(0, tcCusOrder.VatRate, new Currency(1, "DKK", "da-DK"));
                newOrder.TotalPrices.Clear();
                newOrder.OrderLines.Clear();
                #endregion

                foreach (var order in cusOrder)
                {
                    //TC order instance
                    var tcOrderLines = oService.Get(1, order.Id).OrderLines;
                    foreach (OrderLine orderLine in tcOrderLines.Where(x => x.Quantity > 0))
                    {
                        //Create new orderline and product snapshot
                        var snapShot = new ProductSnapshot(1, orderLine.ProductIdentifier);
                        var newOrderLine = new OrderLine(snapShot);
                        //set properties
                        #region orderLineProps
                        newOrderLine.Properties = orderLine.Properties;
                        newOrderLine.Quantity = orderLine.Quantity;
                        newOrderLine.TotalPrice = orderLine.TotalPrice;
                        newOrderLine.TotalPrices = orderLine.TotalPrices;
                        newOrderLine.UnitPrice = orderLine.UnitPrice;
                        newOrderLine.UnitPrices = orderLine.UnitPrices;
                        newOrderLine.VatGroupId = orderLine.VatGroupId;
                        newOrderLine.VatRate = orderLine.VatRate;
                        newOrderLine.CopiedFromOrderLineId = orderLine.Id;
                        newOrderLine.LanguageId = orderLine.LanguageId;
                        newOrderLine.Name = orderLine.Name;
                        newOrderLine.OriginalUnitPrices = orderLine.OriginalUnitPrices;
                        #endregion

                        //Add price(s)
                        newOrder.OrderLines.Add(newOrderLine);
                        var price = new Price(newOrderLine.UnitPrice.Value, newOrderLine.VatRate, new Currency(1, "DKK", "da-DK"));
                        newOrder.TotalPrices.Add(price);
                    }
                    newOrder.Finalize(newOrder.TransactionInformation.AmountAuthorized.Value, tcCusOrder.TransactionInformation.TransactionId, new PaymentState(), tcCusOrder.PaymentInformation.PaymentMethodId.Value.ToString());

                   //Null ref exception
                   newOrder.Save();


                }
            }

Any ideas? First thoughts? I know the question is a bit vague and there's a lot of parameters and uncertainties that could cause this. But I'm hoping a quick glance from you could lead me on the right path. Thanks. And let me know if you want it in Danish.