Taxable event in the GST regime is supply of goods. Exports being inter-State supply, you would be required to obtain GST registration. The manufacturer would be supplying you the goods on the payment of IGST or CGST and SGST/ UTGST as applicable. You may avail of input stage credit of the tax paid on goods and services and export the goods under bond/LUT. Unutilized credit can be availed as refund. Alternatively, you may export the goods on payment of integrated tax and refund of integrated tax would be available to you.