You can find the approval_request_id of the job you wish to approve via the listWorkflowJobs endpoint:
GET /api/v2/workflow/:id/job
Jobs that can be approved (i.e. approval jobs) will have an approval_request_id field.
You can find the approval_request_id of the job you wish to approve via the listWorkflowJobs endpoint:
GET /api/v2/workflow/:id/job
Jobs that can be approved (i.e. approval jobs) will have an approval_request_id field.