Extending the price service is definitely the way to go. I assume that you can't price the individual components of the configuration so what I'd do is have the price service look for the top level of the configuration and calculate prices for that based on its subcomponents.

The price service will receive requests to calc price for the components as well, in which case I'd simply return a price on zero.

For the m2 calculation you could go with a different approach which is basically to calculate price on a per order line bases using the basket pipeline. This would effectively let you override the price calculated by uCommerce by having the first step in the basket be your overriding logic. For the scenario you describe where you need additional contextual information it would make sense to go with this approach.

Thanks Soeren for the precious information provided.

I just have an additional question regarding the iPricingService interface. I had a look at it and I see two methods :

GetProductPrice(Product, ProductCatalog) and
GetProductPrice(Product, PriceGroup)  

Both methods are based on the product + productCatalog or priceGroup. In my case the price will depend on total square meters which results in the quantity multiplied by the size of the product. From what I see there is no way to have contextual information trough the iPricingService interface.

I could calculate price on a per order line using basket pipeline but what I would like is to display the price for the base product and for each option directly in the product configurator so the visitor can compare the different options and prices.

Thanks

Gilles 

Interface

I see.

In that case what you want to do is provide the pricing service with some context and do the price calc multiple times per product.

Basically what you can do is create a custom property on the product, which specifies the number of "m2" you want to display a price for:

var product = Product.SingleOrDefault(x => x.Sku == "mySku" && x.VariantSku == "myVariantSku");
product["m2"].Value = "10";

var priceService = ObjectFactory.Instance.Resolve<IPricingService>();
PriceGroupPrice priceFor10SqMeters = priceService.GetProductPrice(product, catalog);

product["m2"].Value = "20";
PriceGroupPrice priceFor20SqMeters = priceService.GetProductPrice(product, catalog); 

Inside the price service you'll look at the "m2" property and perform the calculation based on that. 

Hope this helps.

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