Decision Walk: the bank-change chain

Existing relationship The email lands inside a real vendor thread, references the right invoice number, and asks that tomorrow’s payment use a new account. That is exactly why BEC works: the request fits a real workflow closely enough to feel routine. Control principle Separate the request from the authentication IC3 recommends confirming transfer requests with previously known phone numbers and adding additional sign-off for payment-location changes. Do not let a single email both propose and authenticate a funds-transfer change. Initial read Step 1 The sender asks you to keep the update moving because the vendor’s old bank account is closing…

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