Case Study

How We Built an Intelligent OCR Orchestration System to Automate Invoice Matching for Finance Teams

AI & GenAI
Industry
Finance & Accounting (Cross-Industry)
Services
AI Document Processing · OCR Orchestration · LLM Integration · Finance Automation
Company Size & Location
Cross-Industry & Global
Technology Stack
DocTR · Amazon Textract · OpenAI (LLMs)
Team
AI/ML Engineers · Backend Engineers · QA Engineer
Timeline
Solution Accelerator
01

Client Vision

Finance and accounting teams across industries face a shared operational burden processing high volumes of invoices, purchase orders, and compliance documents manually, with every error carrying real financial consequences. The vision behind this solution was to eliminate that burden entirely: an intelligent document processing platform that combines multi-engine OCR with Large Language Models to extract, contextualise, and validate financial data automatically turning messy, varied documents into structured, action-ready information at scale.

02

Challenge

Manual financial document processing is slow, costly, and error-prone and the consequences compound at scale.

Complex, Varied Document Layouts

Invoices, purchase orders, and compliance forms arrive in inconsistent formats across suppliers and systems. No single OCR engine handles every document type with reliable accuracy, and errors in extraction cascade into downstream payment and reporting failures.

The Three-Way Match Problem

Verifying invoices against purchase orders and goods received - the three-way match is a critical but labour-intensive process. Done manually, it creates payment delays, supplier disputes, and exposure to overpayments that are difficult to recover.

Data Quality Without Consistency

Raw OCR output, even when mostly accurate, lacks the contextual understanding needed to map extracted values into structured financial records. Without a validation layer, data integrity cannot be guaranteed at volume.

Cost of Premium OCR at Scale

High-accuracy cloud OCR services are powerful but expensive. Running every document through a premium engine regardless of complexity is neither cost-efficient nor necessary - but without a smarter routing strategy, there is no alternative.

03

Solution

Focaloid built an intelligent OCR orchestration platform that combines open-source and cloud OCR engines with confidence-based routing and LLM-powered contextualisation delivering maximum accuracy at controlled cost.

Adaptive Multi-Engine OCR Processing

Documents are first processed through DocTR, an open-source OCR engine, for initial extraction. Only documents that fail to meet confidence thresholds are escalated to Amazon Textract ensuring premium processing is applied where it matters, keeping costs in check without sacrificing accuracy.

Confidence Score Checkpoints

At each stage of the pipeline, extracted data is evaluated against established accuracy thresholds. Documents only progress when confidence is validated maintaining data integrity throughout and flagging exceptions for human review rather than letting errors propagate silently.

LLM-Powered Contextualisation

Specially configured OpenAI models transform raw extracted data into structured, validated financial information. Rather than returning loose text, the LLM understands document context - supplier details, line items, quantities, pricing and maps it directly to the data structures needed for downstream processing and reporting.

Automated Three-Way Invoice Matching

Extracted invoice data is automatically compared against corresponding purchase orders and delivery receipts. Mismatches in quantity or pricing trigger instant alerts to the accounts payable team preventing erroneous payments before they are made.

Continuous Learning via Few-Shot Training

The system continuously refines its extraction and classification capabilities using few-shot learning, improving accuracy over time with minimal manual input.

Seamless Financial System Integration

Once an invoice is confirmed accurate, data updates automatically in the client's financial system enabling prompt, accurate payment without any manual re-entry.

04

Our Approach

Phase 1: Document Analysis & Pipeline Design

Assessed the range of document types, layouts, and processing volumes in scope. Designed the multi-engine OCR routing logic, confidence threshold framework, and LLM contextualisation layer.

Phase 2: OCR Orchestration Build

Implemented the DocTR-first pipeline with Amazon Textract escalation, wired to confidence score evaluation at each checkpoint. Validated extraction accuracy across a representative document set.

Phase 3: LLM Integration & Matching Logic

Configured OpenAI models for financial document contextualisation. Built the automated three-way matching engine with discrepancy alerting and exception handling.

Phase 4: Integration & Continuous Learning

Connected the pipeline to the client's financial systems for automated data updates. Implemented few-shot learning loops to enable ongoing accuracy improvement post-deployment.

05

Result / Impact

For the Client

  • Intelligent OCR orchestration delivered - multi-engine routing with confidence checkpoints ensuring accuracy without over-reliance on premium processing
  • Automated three-way invoice matching implemented - eliminating manual comparison of invoices, purchase orders, and delivery receipts
  • Full financial system integration achieved - validated invoice data flows directly into downstream systems without manual re-entry
  • Continuous learning pipeline established - system accuracy improves over time with minimal human input

For End Users (Finance & Accounts Payable Teams)

  • Significantly less time spent per invoice - manual data entry and comparison eliminated across the document processing workflow
  • Instant discrepancy alerts surfacing mismatches in quantity or pricing before any payment is made
  • Structured, action-ready financial data replacing raw, inconsistent OCR output
  • Reduced cognitive load - teams focus on exception handling and decisions, not routine document processing

For the Business

  • Reduced processing errors - automation minimises human error, ensuring payments are accurate and justified
  • Improved cash flow through faster, accurate invoice processing - enabling timely payments, avoiding late fees, and capturing early-payment discounts
  • Stronger supplier relationships supported by reliable, prompt payment cycles
  • A scalable cloud-based foundation that grows with document volumes without proportional cost increases

06

Why It Matters

Finance teams drown in documents and the manual work of reading, matching, and validating them is slow, costly, and error-prone. A single mismatched invoice can mean an overpayment, a late fee, or a strained supplier relationship. By orchestrating multiple OCR engines with confidence checkpoints and layering LLMs on top to understand and structure the data, this solution does the reading and matching automatically - accurately, affordably, and at scale. The result is a finance function that spends its time on decisions, not data entry.

Let's build

Spending too much time matching invoices by hand?

We build intelligent OCR-plus-LLM document solutions that automate extraction, matching, and validation for finance teams - accurate, compliant, and cost-efficient at scale.