Duplicate Expense Detection — Proposed Guide

Planned API — Reference Only

Duplicate Expense Detection: Duplicate detection could flag expenses with similar receipts, merchant details or amounts. Similarity is a review signal,…

Overview

Duplicate detection could flag expenses with similar receipts, merchant details or amounts. Similarity is a review signal, not conclusive evidence of fraud.

Key concepts

Compare employee, date, currency and receipt relationships. Distinguish a legitimate split allocation from a duplicated submission.

Implementation considerations

Do not delete or reject a candidate automatically without a reviewed policy. Record why the match was proposed and how it was resolved.

Illustrative data model

This local fixture shows a possible representation for the concepts above. It is not an endpoint response, production configuration or a claim that the described capability is implemented.

JSON fixture

Fictional concept fixture

{
  "reference_only": true,
  "topic": "Duplicate Expense Detection",
  "expense_id": "exp_example_123",
  "candidate_id": "candidate_example_123",
  "match_reason": "match reason example",
  "confidence": 0.82
}

Design review checklist

Document which organization owns the duplicate expense detection representation and which actor may view or change it.
Test the boundaries of expense id, candidate id, match reason, confidence using synthetic values, including missing or inconsistent references.
Before future implementation, obtain an approved contract and review failure behavior. This documentation does not authorize production activation.

Proposed data types

Illustrative field dictionary
Name	Type	Description
expense_id	string	Stable fictional expense reference; not a secret and not evidence that a resource exists.
candidate_id	string	Stable fictional candidate reference; not a secret and not evidence that a resource exists.
match_reason	string	Illustrative match reason value; interpret it only within the proposed topic-specific model described above.
confidence	number	Illustrative confidence score, not evidence of implemented OCR or fraud detection.

Expense Export

Expense Management

Expense Audit Logs