Currently we do not have any supporting feature to add a withdrawal bank account and/or withdraw funds from your OWNED sub account.
Fund withdrawal from OWNED sub accounts can be supported through our Direct Disbursement feature, using parameter for-user-id in the request header and your Master Account’s API Key.
Here is our documentation for your perusal:
We apologize for your inconvenience. But rest assured, we are working on new exciting features to simplify your transaction experience with your OWNED sub account.
Please contact firstname.lastname@example.org more information regarding this.