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Automation should start by identifying every event that could alter payment destination data. This includes requests received by email, supplier portals, shared inboxes, spreadsheets, ERP forms, and internal service desks.

The central principle is simple: never verify a bank-detail change using only the contact method contained in the change request.

A useful audit trail should allow an internal auditor, controller, or investigator to reconstruct the decision without searching through multiple inboxes.