Auditing the HRMIS of the Organization

Hello guys, I am assiged to Audit\inspect the HR Department for the Risks and issues to be removed.
i am reached to the Attendance department of Hr Directorate and i want to know all the risks or i want to know how to find the findings.
the attendance is electronic/biometric and made with php and my sql.
infact, i want to know all the procedures and methods to have a good result of my Auditing.