Payroll Outsourcing - Documentation, Registrations, Charges?

savlihr
We are about to start payroll outsourcing for ITI and diploma level candidates, can someone pls guide us on below points..
1) Registrations to be done before starting
2) Documentations to be maintained
3) Heads to be included under salary slip of temp staff
4) Charges to be taken from company for providing this services.
Thanks to all in advance.
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