ATG Custom Price Engine

In the following example, you have decided you want to create a new pricing engine that prices handling costs separately from shipping. You create a SamplePricingEngine that acts independently of the ShippingPricingEngine.

1.	Create an interface called SamplePricingEngine that extends PricingEngine.
2.	Create an implementation called SamplePricingEngineImpl that extends PricingEngineService.
3.	Create a SamplePricingInfo that extends the AmountInfo price holding class.
4.	Create a calculator called SamplePricingCalculator and implementations of it that calculate and discount handling as your business requires.
5.	Modify the Promotions repository definition file (by default, pricingModels.xml). Add an item-descriptor for the Handling discount type and sub-descriptors for the various  implementations of the SamplePricingCalculator that you created.
6.	Create properties files for the SamplePricingEngine and each of the calculators.
7.	Depending on your needs, configure the new engine with some preCalculators that calculate the base cost of handling. Pricing Engine Class Diagram :