After thorough clarification with iSAMS, it has come to our attention that there are no push notifications available for Leave Requests and unfortunately the resources are not correct:
https://support.isams.com/hc/en-us/articles/360007230478-Create-a-Leave-Request
This implies that the only way to monitor any new leave requests is by manually checking the 'Leave Requests' page under Registration Manager. We believe implementing push notifications for leave request approvers would greatly enhance efficiency and effectiveness in managing leave requests.