law: 4. Trade and commerce of scheduled farmers' produce.-
  (1) Any trader may engage in the inter-State trade or intra-State trade of scheduled farmers' produce with a farmer or another trader in a trade area:
  Provided that no trader, except the farmer producer organisations or agricultural co-operative society, shall trade in any scheduled farmers' produce unless such a trader has a permanent account number allotted under the Income-tax Act, 1961 (43 of 1961) or such other document as may be notified by the Central Government.
  (2) The Central Government may, if it is of the opinion that it is necessary and expedient in the public interest so to do, prescribe a system for electronic registration for a trader, modalities of trade transaction and mode of payment of the scheduled farmers' produce in a trade area.
  (3) Every trader who transacts with farmers shall make payment for the traded scheduled farmers' produce on the same day or within the maximum three working days if procedurally so required subject to the condition that the receipt of delivery mentioning the due payment amount shall be given to the farmer on the same day:
  Provided that the Central Government may prescribe a different procedure of payment by farmer produce organisation or agriculture co-operative society, by whatever name called, linked with the receipt of payment from the buyers.