Tax xC extension points

We can use the tax_integration_custom extension point to integrate with an external tax system to calculate sales and shipping tax. The following table identifies the extension point that we can use for integrating with an external tax system.

Extension point	Where the extension point is used	Extension code implementation tips	Request, Response formats	Sample extension code location
tax_integration_custom	The calculate cart operation (POST cart/calculate or POST cart/{cartId}/calculate) or the pre-checkout cart operation (POST cart/@self/precheckout) calls the tax_integration_custom extension point to calculate tax. Tax_integration_custom is called once to calculate sales tax, with the costs and discounts of the order items as inputs; and once to calculate shipping tax, with the freights of the order items as inputs.	When costs and discounts are supplied, the tax_integration_custom extension code should call the tax system to calculate the sales tax of each order item and set it as the order item's total tax. When freights are supplied, the tax_integration_custom extension code should call the tax system to calculate the shipping tax of each order item and set it as the order item's total tax.	TaxIntegrationCustomCmdUEInput, TaxIntegrationCustomCmdUEOutput	The taxIntegrationOrderCus method in workspace_dir/commerceue-app/src/main/java/com/ibm/commerce/order/ue/rest/OrderResource.java

For an example of registering the extension code and assigning the code to the extension point, see Enable tax integration extensions.