Transaction laundering

What is transaction laundering?

Transaction laundering is a type of payment fraud where transactions from one business are processed through another merchant account.

It often happens when a merchant hides the real source of payments, sells products or services that were not approved during onboarding, or processes payments for another business that does not have its own merchant account. In simple terms, transaction laundering makes payments look as if they belong to an approved merchant, while the real seller or activity is hidden.

How transaction laundering works

Transaction laundering usually involves a mismatch between the business approved by the acquirer or payment provider and the business actually generating the transactions.

For example, a merchant may be approved to sell low-risk goods through one website but then use the same merchant account to process payments for restricted products, high-risk services, fake storefronts, or another business entirely.

This can happen through:

• hidden websites connected to the same payment account;
• redirect flows that send customers to another seller;
• marketplaces or platforms with unverified sub-merchants;
• shell companies or front businesses;
• payment links used for undisclosed products or services;
• merchant accounts shared with third parties.

The payment provider may see transactions from the approved merchant name, while the real source of the payment activity remains unclear.

Common signs of transaction laundering

Transaction laundering can be difficult to detect because the merchant may appear legitimate during onboarding. Possible warning signs include:

• transaction activity that does not match the merchant's declared business model;
• sudden changes in average transaction value or volume;
• payments from countries, customers, or channels not aligned with the merchant profile;
• high chargeback or refund rates;
• customer complaints mentioning another brand, product, or website;
• website content that changes after approval;
• traffic sources that do not match the approved store;
• multiple domains connected to one merchant account;
• unclear product descriptions or billing descriptors.

These signals do not prove transaction laundering on their own, but they can indicate that merchant activity needs closer review.

Transaction laundering in merchant monitoring

Transaction laundering is usually managed through merchant due diligence, KYB checks, website review, transaction monitoring, risk scoring, and ongoing merchant monitoring. Payment providers, acquirers, PSPs, and payment facilitators need to understand not only who the merchant is at onboarding, but also whether the merchant's actual transaction activity continues to match the approved business profile.

This is especially important for platforms and payment businesses that onboard many merchants, sub-merchants, or sellers across different markets and risk categories.

How payment businesses reduce transaction laundering risk

Payment businesses can reduce transaction laundering risk by combining onboarding checks with ongoing monitoring.

Common controls include:

• verifying merchant ownership and business activity;
• reviewing websites, products, and terms before approval;
• monitoring connected domains and payment pages;
• checking transaction patterns against the declared business model;
• tracking chargebacks, refunds, and customer complaints;
• reviewing sudden changes in volume, geography, or product mix;
• monitoring high-risk merchant categories;
• requiring approval for new websites, brands, or business lines;
• using risk rules and manual review for suspicious activity.

The goal is to detect when a merchant's real payment activity no longer matches the business that was originally approved.