Gst for exporter

D.ALL, WE ARE EXPORTER, PREVIOUSLY WE ARE ISSUE 'H ' FOR FOR V.A.T. TAX ( FOR NO PAYMENT OF V.A.T ) & GIVEN BOND FOR C.E.D. SO NOT TO PAY ANY EXCISE DUTY. NOW FORM 1st OF JULY 2017 . G.S.T. WILL START . WHAT IS SYSTEM TO NOT PAY ANY G.S.T. FOR EXPORT OF ANY KIND OF GOODS EXPORT TO OUT OF INDIA.? IF WE ARE PAYING G.S.T. AT TIME OF PURCHASE . THAN HOW WE GATE REFUND. AFTER EXPORTING THE SAID GOODS?