We have a great security feature we just put in place for business accounts (sponsors) to help with things like this;
Payouts Blacklist
Business Account Users can now permanently blacklist payments to any user by entering the payee email into the PAYOUTS BLACKLIST OPTION under Security Menu.
When blocked, all payments to any alternative email accounts of the blacklisted user will not go through. This feature has been added to help prevent against repeated fraud while retaining the privacy and security of every Paxum client.
