requestWithdrawal 
  Withdraws funds from the account and sends it to the requested bitcoin address.
The process is asynchronous and may take up to a few minutes. You can check the progress by polling the WithdrawalRequest that is created, or by subscribing to a webhook.
Parameters
amountSats 
The amount of funds to withdraw in SATOSHI.
bitcoinAddress 
The Bitcoin address to withdraw funds to.
Throws
if the withdrawal failed or if the wallet is locked.