procedure of export

Export of goods amounts to Zero rated supply as per section 18(1)

any procedure for exporting of goods???

There is no prescribed procedure for export but you need to ensure that conditions for export as given u/s 2 of IGST Act 2017 such consideration received in foreign exchange etc need to be satisfied.

The provisions relating to export as stipulated u/s 50 of Custom Act , 1962 need to be satisfied.

you need to execute letter of undertaking for the purpose of claimining refund of taxes paid on export