code: def transferBalance(self, currency, amount, fromAccount, toAccount):
          
          return self._private('transferBalance', currency=currency,
                               amount=amount, fromAccount=fromAccount,
                               toAccount=toAccount)
docs: Transfers funds from one account to another (e.g. from your exchange
           account to your margin account). Required POST parameters are
           "currency", "amount", "fromAccount", and "toAccount".