PRODUCTION SYSTEM · CASE STUDY 001

Built for a high-volume construction businessOperational since Q1 2026
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THE PROBLEM

50+ invoices a week. Every one touched by a human.

A construction business receiving supplier invoices across email daily. PDFs, mixed attachments, statements mixed with invoices. Every document opened manually, read, coded, and entered into accounting software.

The failure points were everywhere. Duplicate invoices getting paid. Statements coded as invoices. Approvals sitting in inboxes for days. No audit trail. No visibility.

The brief: automate the entire chain. From the moment an email arrives to the moment it's approved and coded in the accounting system. Zero manual steps in the critical path.

Accounts TeamOpen EmailRead PDFType into systemChase approvalFileThe process before automation.

THE SYSTEM

What we built.

Six workflow stages. One continuous pipeline. Runs unattended.

Email Trigger
email + PDF
Attachment Handler
extracted data
AI Extraction
validated invoice
Validation & Dedup
approval token
Approval Router
coded entry
Accounting Output

Mixed Attachment Handling

Triage logic identifies the most likely invoice from multi-PDF emails. Secondary documents logged separately.

Idempotent Design

Every workflow step is safe to retry. Duplicate prevention works at the data layer, not just the trigger.

Human-in-the-Loop

Approval thresholds route exceptions to humans via email links. No app required. Full audit trail maintained.

By the numbers.

0+Invoices processed per week
0Manual steps in critical path
~3hrsSaved per day in manual processing
0%Straight-through processing rate

Built and tested against real production data before go-live. Every edge case identified during regression testing was handled before the system touched live invoices. The system has processed without manual intervention since deployment.

The full brief.

Some details are confidential. Here's what we can show.

PROJECT BRIEF — INVOICE AUTOMATION SYSTEMQ4 2025
SYSTEM TYPE:End-to-end invoice processing automation
TRIGGER:Microsoft Outlook email monitoring via Graph API
AI PROCESSING:Document classification and field extraction
INTEGRATION:Accounting software API (cloud-based)
APPROVAL MECHANISM:Token-based human review with expiry
AUDIT TRAIL:Google Sheets logging with timestamp and user tracking
DEPLOYMENT:n8n workflow automation platform
TEST COVERAGE:35 regression test cases across 10 test categories
CLIENT:
SUPPLIER MASTER:
APPROVAL THRESHOLDS:
ACCOUNTING SYSTEM:

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We scope, price, and build. Fixed cost. Production grade. No demos.

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