What are requirements have to be followed for payment of full and final settlement for contract workers in a factory?

Please explain that as principle employer, what are requirements have to be followed for payment of full and final settlement for contract workers in a factory.
please let us know the supporting laws and format as prescribed by the law

The full and final settlement has to be done by the contractor and the principal employer can keep a copy of the receipt for its record. There is no master - servant relationship between a contract labourer and Principal Employer so no legal liability attaches to the P.E.