law: Indian Post Office Act, 1898 
  43. Power to maintain money order system and to make rules
  
  as to remittances thereby 
  (1) The Central
  
  Government may provide for the remitting of small sums of money through the
  
  Post Office by means of money orders, and may make rules as to such money
  
  orders.
  (2) In particular and
  
  without prejudice to the generality of the foregoing power, such rules may
  
  prescribe-
  (a) the limit of
  
  amount for which money orders may be issued;
  (b) the period during
  
  which money orders shall remain current ; and
  (c) the rates of commission or the fees to be
  
  charged on money orders or in respect thereof.