Payslips are to be submitted in the application as evidence to meet the Need to Work Test. There is no need to continually submit payslips unless there is a change of circumstances.
For more information on CPP please see - https://students.flinders.edu.au/finances-and-admin/commonwealth-prac-payment
For more information on CPP please see - https://students.flinders.edu.au/finances-and-admin/commonwealth-prac-payment