Oct 8, 2026

Online Payment Fraud: Choose a Merchant Investigation Guide

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TL;DR:

Use this learning path to choose an online-payment or transfer-fraud investigation. Distinguish the payment state, customer allegation, available evidence, and applicable provider instructions.

Key Takeaways:

Start with the actual payment and order chronology.
Use separate routes for card testing, authorization, transfer scams, and first-party dispute assessment.
Use the in-store fraud path for card-present and EMV cases.

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A fraud investigation should distinguish the observed payment event, the customer’s allegation, and the evidence available to support a conclusion. This directory routes merchants to online-payment, transfer, authentication, and response-operation guides.

Start with these decisions

Start with payment state and the observed pattern rather than labeling every dispute as customer fraud.
For online orders, separate card testing, account misuse, payment authorization, fulfillment, and first-party dispute assessment.
For transfer incidents, identify the actual product and complaint before applying an assumption from a card-payment case.

Choose a specialist guide

Merchant task	Guide	What it covers
Map ecommerce fraud patterns	Ecommerce Fraud: Types, Chargeback Outcomes, and Merchant Response	An overview of order, account, and payment risks.
Implement ecommerce controls	Ecommerce Fraud Protection: Build Controls Around Chargeback Outcomes	Evaluate friction, loss, and legitimate-order acceptance.
Review payment-flow controls	Payment Fraud Prevention: Reduce Fraud Without Increasing False Declines	Authorization, authentication, capture, and fulfillment.
Act on a suspicious payment	Fraudulent Transactions: Refund, Block, or Fight the Dispute?	Choose actions by payment and fulfillment state.
Understand authorization and consent	Unauthorized Transactions: Prevention, Liability, and Chargeback Evidence	Distinguish approval, authentication, and permission.
Investigate authorization spikes	Card Testing Attacks: Prevent Authorization Abuse and Follow-On Chargebacks	Identify automated payment attempts and measure the event.
Assess suspected first-party misuse	Suspected Chargeback Fraud: How to Assess a Dispute Before You Respond	Compare the allegation with transaction and customer records.
Run fraud-dispute operations	Chargeback Fraud Management Explained: Purpose and Benefits	Ownership, evidence, escalation, and measurement.
Investigate transfer-related scams	What Is P2P Fraud? Understanding Peer-to-Peer Payment Scams	Unauthorized transfers and scam-induced payments.

Use a neutral investigation record

Record what happened, when it happened, which transaction is affected, which claim was made, and what each exhibit can establish. Keep suspected fraud separate from confirmed fraud and service failures. A processor approval does not by itself establish customer permission, and payment authentication does not prove fulfillment.

Use the existing friendly-fraud overview and Visa CE3.0 explainer for their specialist contexts. The evidence learning path covers how to prepare a permitted merchant response.

Use the in-store path for terminal-based payments

For a card-present, counterfeit-card, or EMV case, continue to In-Store Fraud and EMV Liability: Merchant Guides. That directory focuses on terminal records, entry mode, and the conditions relevant to the actual dispute.