Developer forum

Hi DW,

We have this code running on a site to set VAT to 0% if a specific country in EU is selected, and a VAT/EAN number is supplied.

[Dynamicweb.Extensibility.Subscribe( Dynamicweb.Notifications.eCommerce.Cart.BeforeRenderingNewStep )]
  public class OCDBeforeRenderingNewStep : Dynamicweb.Extensibility.NotificationSubscriber
  {
    public override void OnNotify( string notification, Dynamicweb.Extensibility.NotificationArgs args )
    {
      Dynamicweb.Notifications.eCommerce.Cart.BeforeRenderingNewStepArgs afterCustomerCountryIsSetArgs = args as Dynamicweb.Notifications.eCommerce.Cart.BeforeRenderingNewStepArgs;

      
      // Country must be set for this notification to do anything
      if ( afterCustomerCountryIsSetArgs.Order.CustomerCountryCode == null ) {
        return;
      }

      // If we're not on the correct cart page, don't run the code
      string gsCartPageID = Dynamicweb.Base.GetGs( "/Globalsettings/Co3/EventCartPageId" );
      string pageID = Dynamicweb.Base.Request("id", true);
      if ( pageID.Equals( gsCartPageID ) == false )
      {
        return;
      }

      string orderCountryCode = afterCustomerCountryIsSetArgs.Order.CustomerCountryCode.ToUpper();
      if ( string.IsNullOrEmpty( orderCountryCode ) == false )
      {
        Dynamicweb.eCommerce.International.CountryCollection countries = Dynamicweb.eCommerce.International.Country.getCountries( orderCountryCode );
        double countryVat = countries[0].Vat;

        Dynamicweb.eCommerce.Orders.Order o = afterCustomerCountryIsSetArgs.Order;
        // Test if VAT number is set and country is in the EU
        if ( string.IsNullOrEmpty( afterCustomerCountryIsSetArgs.Order.CustomerVatRegNumber ) == false )
        {
          // Set VAT to 0
          if ( Helper.IsEuMemberCountry( orderCountryCode ) == true && orderCountryCode.Equals( "DK" ) == false )
          {
            UpdateVATOnOrder( ref o, 0 );
          }
          // Set VAT to countries standard VAT
          else
          {
            UpdateVATOnOrder( ref o, countryVat );
          }
        }
        // If VAT number is not present, calculate VAT again,since it could have been reset earlier.
        else
        {
          UpdateVATOnOrder( ref o, countryVat );
        }
      }
    }

    private void UpdateVATOnOrder( ref Dynamicweb.eCommerce.Orders.Order order, double newVAT )
    {
      // Do nothing if cart is null
      if ( order == null )
        return;

      // Loop orderlines and change unitprice.
      foreach ( Dynamicweb.eCommerce.Orders.OrderLine ol in order.ProductOrderLines )
      {
        var olPrice = ol.UnitPrice;
        SetNewVat( olPrice, newVAT );

        ol.SetUnitPrice( olPrice, true );

        ol.Type = ((int)Dynamicweb.eCommerce.Orders.OrderLine.OrderLineType.Fixed).ToString();
      }

      order.ClearCachedPrices();

      var payFeeWithoutVat = order.PaymentFee;
      SetNewVat( payFeeWithoutVat, newVAT );
      var shipFeeWithoutVat = order.ShippingFee;
      SetNewVat( shipFeeWithoutVat, newVAT );

      var newOrderPrice = order.PriceBeforeFees.Add( payFeeWithoutVat ).Add( shipFeeWithoutVat );

      // set new orderprice
      order.AllowOverridePrices = true;
      order.Price.PriceWithoutVAT = newOrderPrice.PriceWithoutVAT;
      order.Price.PriceWithVAT = newOrderPrice.PriceWithVAT;
      order.Price.VAT = (newOrderPrice.VAT >= 0 ? newOrderPrice.VAT : 0);
      order.Price.VATPercent = (newOrderPrice.VATPercent >= 0 ? newOrderPrice.VATPercent : 0);
    }

    private void SetNewVat( Dynamicweb.eCommerce.Prices.PriceInfo price, double newVat )
    {
      price.PriceWithVAT = price.PriceWithoutVAT * (1 + (newVat / 100));
      price.VAT = price.PriceWithVAT - price.PriceWithoutVAT;
      price.VATPercent = newVat;
    }
  }

Last week we updated to 8.4.1.8 and now the code above removes Discounts from the cart. Do you have any idea what part of the code does this, and what i should change to avoid it.

// Martin