OPP for Totaling Orders

The Order Processing pipeline (OPP) that computes the sum of the subtotal, tax, shipping, and handling values.

Shipping Stage

This stage calculates the total shipping charge for the order.

The components included in this stage are shown in the following table.

Component	Description
Commerce.Splitter	Divides an order into groups based on the `shipping_method_id` and the `Shipping_address_id` keys.
Commerce.ShippingMethodRouter	Runs components to process the shipments and calculates the shipping total for the entire order.
ShippingDiscountAdjust	Applies shipping discounts to an order.

This stage calculates the total handling charge for the order.

The components included in this stage are shown in the following table.

Component	Description
DefaultHandlingCy	Sets the `_handling_total` key to zero.
RequiredHandlingCy	Ensures that the `_handling_total` key was set.

This stage calculates the sales tax for each item on the order and the sum of the tax for the entire order.

The components included in this stage are shown in the following table.

Component	Description
SampleRegionalTax	Calculates the tax for the order.
RequiredTaxCy	Ensures that the tax values are set.

This stage sums the subtotal, tax, shipping, and handling values.

The components included in this stage are shown in the following table.

Component	Description
DefaultTotalCy	Computes the _`cy`_`total`_`total` key as the _`cy`_`oadjust_subtotal` key plus the _`cy`_`shipping`_`total` key plus the _`cy`_`handling`_`total` key plus the `_cy_tax_total` key.
RequiredTotalCy	For each key/value pair in the _Verify_With dictionary, this component reads the same key from the order form. If any of the values do not match, or keys do not exist, the error "MessageManager("pur_badverify")" is added to the _Purchase_Errors log.

This stage verifies that every item ordered is in stock.

This stage copies fields of interest to the application, onto the order form.

Component	Description
CopyFields	Copies the _`product`_`description` key into the description field, which is saved to a database, enabling future product description searches on the order. It also copies the `user`_`first`_`name` key from the profile for the user onto the order form. This also enables future first name searches and allows the first name of the user to be displayed without looking up the profile for the user.