The situation
Accounts payable was preparing a large outbound payment to a long-standing Bulgarian supplier. The invoice looked routine, the amount matched the purchase order, and the payment instruction in the email thread pointed to a bank account the team believed they already knew. In a busy closing week, the wire was minutes away from approval.
The signal
Monitoring detected a change to the supplier's registered bank account data and pushed an alert to the procurement owner. That created a mismatch between “what the invoice asks for” and “what the public register currently shows,” which is exactly the gap payment-fraud schemes try to exploit when attackers redirect wires through urgent email requests.
The response
The team stopped the transfer, compared the invoice account against the newly registered details, and verified the change through a known contact channel instead of replying to the payment email. Finance treated the alert as a hard hold until the beneficiary details were confirmed through an out-of-band check.
The outcome
No high-value wire left the company on unverified instructions. The near-miss reinforced a simple operating rule: register-backed bank account monitoring is part of payment control, not an optional compliance nice-to-have.