You are using below URLs to approve and reject workflows:
https://apixx.xxxx.xxx/odata/v2/approveWfRequest?wfRequestId=<WorkflowId>L (approver = logon user which you have configured in EC)
https://apixx.xxxx.xxx/odata/v2/rejectWfRequest?wfRequestId=<WorkflowId>L (approver = logon user which you have configured in EC)
As per your requirement, you need common user-Id so that the workflow request can be approved/rejected apart from the respective assigned approver.
Delegate Workflows, Workflow API, ODATA , KBA , LOD-SF-INT-ODATA , OData API Framework , LOD-SF-INT , Integrations , LOD-SF-EC , Employee Central , LOD-SF-EC-WFL , Workflows - Configuration, Tools, Objects & Rules , How To
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