Employer realized she didn't pay minimum wage? Was off by 600/- rupees - What should she do now?

The employer realized she didn't pay the minimum wage for last 1 year. Was off by 600/- rupees when he checked now. What should she do now?
Can she pay the difference now? Any kind of document required for paying it. Is ESI/PF applicable to this? If yes, how to file ESI and PF for it now? should it be clubbed with this month's salary and paid?

Dear Vignesh,
In case of non-payment of minimum wages by the employer, it can be rectified by paying the difference amount by means of arrears. Since it is virtually a process of revision of wages, the proportionate amount from the arrears can be deducted now and remitted to the EPF and ESI.