https://developer.salesforce.com/docs/industries/cme/guide/comms-uses-of-cpqapphandlerhook.html
Uses of CpqAppHandlerHook | Configure, Price, Quote (CPQ) Cart APIs | Communications, Media, Energy...
In Industries CPQ, CPQ functionality is managed by a global interface called CpqAppHandler. It includes a wide range of methods to perform CPQ process
configure price quote
https://developer.salesforce.com/docs/industries/cme/guide/comms-create-the-cpqapphandlerhook-implementation.html
Create the CpqAppHandlerHook Implementation | Configure, Price, Quote (CPQ) Cart APIs |...
In this task, Felix needs to create the interface implementation hook. The hook interface provides a hook to the implementation method for pre-invoke
configure price quotecreateimplementationcpqcart