Send the approved transfer request to the delivering custodian and retain its validation or exception

Fresh retirement writer. Sends the independently approved instruction, re-validated against the current account, holder and classification, to the delivering custodian and retains its validation or exception. The request id is the instruction id, so a retry after a lost answer receives the same confirmation, and a retained confirmation is returned rather than requested again. Locally the adapter is the delivering-custodian simulator, whose answers are marked simulated and are relied on only in the local environment; real transfers are bilateral or run through DTCC's ACATS for NSCC participants, whose formats are proprietary, and no certified integration exists. An accepted answer above the reviewed maximum or from another sending routing number refuses.