Hello Varun,
From the discussion thread, I see that the question is with respect to Ariba P2P to S/4 HANA Integration. If yes, then CI-7 now provides standard integration options for Ariba Sourcing and Contract Management Solutions, Ariba Procurement Solutions, Ariba Network and SAP Fieldglass with SAP S/4HANA 1503 OnPremise. All the documentation related to this integration can be found in the CI 7.0 release guide .
If it is related to SAP Ariba P2P and SAP Ariba Sourcing integration then there is no PI integration at all. This happens via internal cXML integration where customer doesn’t need any PI or other middleware.
Best Regards,
Mani