IPC - where to start?

Hi all,

we are using the IPC 3.0 in a Internet Sales Scenario based on CRM.

I have to implement certain numbers in method checkRequirement() in class PricingUserExit. I´m not able to get all the information I need to decide if a certain conditiuon is relevant or not.

My question: Where do I get a documentation of the interactions of the classes in the process of pricing?

Where do I get a useful documentation of IPC? The separated documents which could be found on the IPC or on help.sap.com did not help.

Thanks for replies!