Federation of Indian Export Organisations (FIEO) said this move would help reduce transactions time and cost.
FIEO President Ganesh Gupta said that exporters would face liquidity problems under the GST, as they have to first pay tax while procuring inputs and get refund subsequently after some lag.
"This leads to blockage of working capital," he said in a statement.
"The entire refund mechanism for exporters should be brought into one window for reducing transaction time and cost," he added.