Prepare Request Method
This method prepares the request integration object for the OPA outbound web service for the following actions:
Start interview (StartInterviewRequest:StartInterviewRequest)
Investigate for next screen (InvestigateRequest:InvestigateRequest)
Snapshot interview (SnapshotSessionRequest:SnapshotSessionRequest)
Restore interview (RestoreSessionRequest:RestoreSessionRequest)
End interview (EndInterviewRequest:EndInterviewRequest)
This method reads operation type from the global session and makes the appropriate call. The frame determines the operation type.