SAP PI to Successfactors Integration - Recruiting

Hi All,

I am implmenting Recruiting integration between SAP ECC to Successfactors. It has the following flows:

1. Vacancy to Job Requisition

2. Candidate Information

As per SAP's help https://help.sap.com/erp_sfi_addon20/helpdata/en/28/1c5351400bec63e10000000a44176d/content.htm?frameset=/en/ae/2925517aeefd50e10000000a441470/frameset.htm&current_toc=/en/9b/39541ea628461da1119d1b66bf4011/plain.htm&node_id=17&show_children=true#jump31

Services for the integration scenario for recruiting data:

• SFSFSessionHandlingLoginQueryResult_Out
• SFSFSessionHandlingLoginQueryResult_In
• SFSFQueryHandlingSubmitJobQueryResponse_Out
• SFSFQueryHandlingSubmitJobQueryResponse_In
• SFSFQueryHandlingGetJobStatusQueryResponse_Out
• SFSFQueryHandlingGetJobStatusQueryResponse_In
• SFSFQueryHandlingGetJobResultEmbeddedQueryResponse_Out
• SFSFQueryHandlingGetJobResultEmbeddedQueryResponse_In
• SFSFJobApplicationStatusUpdateRequestConfirmation_Out
• SFSFJobApplicationStatusUpdateRequestConfirmation_In
• SFSFQueryHandlingCancelJobQueryResponse_Out
• SFSFQueryHandlingCancelJobQueryResponse_In
• SFSFSessionHandlingLogoutQueryResult_Out
• SFSFSessionHandlingLogoutQueryResult_In
• SFSFAPIDictionaryListSFObjectsResult_Out
• SFSFAPIDictionaryListSFObjectsResult_In
• SFSFAPIDictionaryDescribeSFObjectsExResult_Out
• SFSFAPIDictionaryDescribeSFObjectsExResult_In
• SFSFCandidateUserIdUpdateRequestConfirmation_Out
• SFSFCandidateUserIdUpdateRequestConfirmation_In
• SFSFGenericUpsertRequestConfirmation_Out
• SFSFGenericUpsertRequestConfirmation_In

However for my knowledge and Technical specifications, can someone please tell me which are actually used (and sequence)  in these 2 scenario's :

1. Vacancy to Job Requisition

2. Candidate Information

Also, what is the purpose and use of each of these services. I have read almost all the documents available on internet but unable to find this information....so please help!!

Thank you.