Override Tax Calculation

To support products with individual tax set we need to override ITaxService to make it take the product setting rather than the default tax info from the price group into account.

 

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Relevant APIs

UCommerce.Catalog
    ITaxService
    TaxService

UCommerce.EntitiesV2
    Product
    PriceGroup

UCommerce.Extensions
    DynamicProperty<T>()

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Hands-on

1. Set up a field with the PriceGroupControlFactory.
2. Set a custom price group on a product.
3. Inherit TaxService and override the CalculateTax method.
4. Check the product for the field (take into account variants).
5. Load the price group based on the id stored in the field.
6. Calculate tax based on the loaded price group.