Data Flow

ATM Cash Withdrawal: Context vs Level-1

Data Flow Diagrams (DFD) · made in Skemio

Level-1 DFD showing ATM PIN validation, core bank ledger verification, audit journal logging, and cash dispenser trigger.
Level-1 DFD showing ATM PIN validation, core bank ledger verification, audit journal logging, and cash dispenser trigger.
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What it shows

  • Card authentication stores local session tokens before processing balances.
  • Core banking ledgers must confirm balance holds prior to hardware actions.
  • Cash dispensers trigger strictly after atomic writes to the audit journal.

The takeaway

Hardware triggers in embedded banking must be gated behind atomic ledger writes.

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