code: def request_withdrawal(self, amount: Number, address: str, subtract_fee: bool=False, **params) -> Withdrawal:
          
          self.log.debug(f'Requesting {self.currency} withdrawal from {self.name} to {address}')
          amount = self._parse_money(amount)
  
          if self.dry_run:
              withdrawal = Withdrawal.create_default(TxType.WITHDRAWAL, self.currency, amount, address)
              self.log.warning(f'DRY RUN: Withdrawal requested on {self.name}: {withdrawal}')
              return withdrawal
  
          try:
              withdrawal = self._withdraw(amount, address, subtract_fee, **params)
          except Exception as e:
              msg = f'Failed requesting withdrawal on {self.name}!: amount={amount}, address={address}'
              raise self.exception(InvalidWithdrawal, msg, e) from e
  
          self.log.info(f'Withdrawal requested on {self.name}: {withdrawal}')
          return withdrawal
docs: Request a withdrawal.