we want to initiate the SIT service automatically

we want to initiate the SIT service automatically. which will have approve/reject options   Usually a SIT will be initiated by a user from a self service responsibility. We want to automate this process based on an event like expiry of employee's contract. we have raise one SR with Oracle they have mention  about  API API: HR_SIT_API ; procedure CREATE_SIT

This API create the SIT directly into the respective tables. what we were looking for was to have the complete process of the SIT itself where it goes through the attached workflow with

APPROVE,REJECT,REQUEST for information.