SAP cloud platform: identity provisioning and Authentication services with SCP and Successfactors

We current hold user information in our SAP SuccessFactors system as well as our SAP IDM. We would like to be able to use this information to authenticate users in SAP Cloud Platform. What steps do … I need to follow ? Setup SuccessFactors as the SOURCE in the SCP Indentity provisioning service. Or would it be better to use our SAP IDM ? What would be the TARGET be in the Identity provisioning service?, the SCP Identity authentication service?
Thanks
Richawilliams

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