Having upgraded to TeaCommerce v3, I am having to adjust some existing code to support a discounts system we wrote for TeaCommerce.

Essentially, we have special 'discount' products, which can contain a discount, this can be of value e.g. £10 or a percentage based e.g. 10%.

For the percentage discount to work, we need to grab the total order value, however it seems like this is no longer accessible in the 'CalculateOrderLineTotalPrice' method.

I refactored the existing code and moved into the OrderTotalPrice override method, however, this doesn't properly affect the total price. (see: ol.UnitPrice.Value and ol.TotalPrice.Value inside foreach)

protected override Price CalculateOrderTotalPrice(Order order, Currency currency)
    {
        Promotions promos = Promotions.GetInstance(); // node
        decimal fullPrice = order.TotalPrice.Value.Value;
        string pc = order.Properties["promocode"];

        var promoLines = order.OrderLines.Where(ol => ol.ProductIdentifier == promos.Id.ToString(CultureInfo.InvariantCulture));  // select promo items

        foreach (OrderLine ol in promoLines)
        {
            PromoCode pco = promos.PromoCodes.Where(c => String.Equals(c.Code, pc, StringComparison.OrdinalIgnoreCase)).FirstOrDefault(); // match specific promo code
            // Test is Promotional Code is still Valid
            if (pco != null && pco.ExpiryDate >= DateTime.Now && pco.MinimumOrderValue <= fullPrice)
            {
                decimal newPrice = ol.UnitPrice.Value.Value;
                if (pco.DiscountValue > 0)
                {
                    newPrice = pco.DiscountValue * -1;
                }
                else
                { 
                    newPrice = (fullPrice * (pco.DiscountPercentage / 100)) * -1; 
                }
                ol.UnitPrice.Value = new Price(newPrice, order.VatRate, currency);
                ol.TotalPrice.Value = new Price(newPrice, order.VatRate, currency);
            }
        }

        return base.CalculateOrderTotalPrice(order, currency);
    }

Any ideas on correctly setting the Price, or getting access to the Order within "CalculateOrderLineTotalPrice(OrderLine orderLine, Currency currency)" would be really appericated.

Thanks, Laurie