You are planning to use Business Scenario: "Real-time User Account Sync from SAP SuccessFactors to SAP IPS" to sync data between SAP SuccessFactors and SAP IPS application.
Note that recommendation here is not to use this business scenario to sync real time user sync from SAP SuccessFactors application to SAP IPS application due to known limitation and issues till further communicated.
Recommended way would be to trigger the sync from IPS application as documented in below section of the guide:
Running and Scheduling Jobs
IAS, IPS, User Sync , KBA , LOD-SF-INT-INC-FWK , Integration Center UI Framework , Problem