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Project 04 / Finance operations
Invoice Processing & Approval
Extracts invoice data, validates it and blocks accounting writes until approval requirements are satisfied.
event.accepted200
idempotency.checkedPASS
control.appliedTRUE
outcome.recordedVERIFIED
01 / Problem
Invoice automation can create duplicate liabilities or bypass approval rules if the workflow only follows the happy path.
02 / System
Designed as a controlled operational pipeline.
A controlled pipeline extracts normalized fields, checks duplicates and approval thresholds, then creates an accounting draft rather than executing payment.
01
Duplicate invoice prevention
02
Approval threshold enforcement
03
Draft accounting record only
03 / Reliability controls
What keeps the system honest.
Schema validation
Duplicate key
Approval check
No payment execution
Technology contract
n8nOCR adapterAccounting APIJavaScript
04 / Verification
Deterministic proof
Approved, rejected and duplicate scenarios passed deterministic tests.
Evidence boundary
Read the full evidence method This is a locally verified engineering demonstration using synthetic data and controlled service adapters. It is not described as a production client deployment unless live evidence is added later.