In order to withdraw fiat currency log in to your BitBay Pay account and select the "Balances" section from the menu on the left. Select the currency of your withdrawal and use our dedicated system tool to move funds from BitBay Pay account to your BitBay exchange.
After that proceed to your BitBay account and then choose "Wallets" section from the menu on the left. Next, select the currency in which you want to make a withdrawal.
More information about withdrawals you can find via this link: https://bitbay.net/en/helpdesk/payments-and-withdrawals/how-to-withdraw-eur-usd-or-pln-from-bitbay-account-to-my-bank-account