code: def moveOrder(self, orderNumber, rate, amount=None, postOnly=None,
                    immediateOrCancel=None):
          
          return self._private('moveOrder', orderNumber=orderNumber, rate=rate,
                               amount=amount, postOnly=postOnly,
                               immediateOrCancel=immediateOrCancel)
docs: Cancels an order and places a new one of the same type in a single
          atomic transaction, meaning either both operations will succeed or both
           will fail. Required POST parameters are "orderNumber" and "rate"; you
           may optionally specify "amount" if you wish to change the amount of
           the new order. "postOnly" or "immediateOrCancel" may be specified for
           exchange orders, but will have no effect on margin orders.