Sub-Merchant

A sub-merchant is a business whose card or digital payments are processed through the merchant account of another company, typically a payment facilitator, software platform or marketplace, instead of through its own direct agreement with an acquirer. The sub-merchant sells its own goods or services and is identified in each transaction, but the contractual relationship with the acquirer and card networks belongs to the facilitator. Restaurants using an all-in-one booking and payments app, freelancers paid through an invoicing platform and sellers on many online marketplaces are typical sub-merchants.

"Sub-merchant" is the general industry term and the one used in Mastercard's rules; Visa's rules call the same participant a sponsored merchant. The model is distinct from a merchant of record model, in which the platform itself sells to the customer and the underlying business is a supplier rather than a merchant in the card system.

Sub-merchant arrangements are found in several business models:

• Payment facilitators. Companies registered with card networks through an acquirer onboard many small merchants under one master account, using the payment facilitator model.
• Vertical software platforms. Booking, practice management and point-of-sale software providers embed payments and act as facilitators for their customers, an example of embedded finance.
• Marketplaces. Platforms that connect buyers and sellers may treat each seller as a sub-merchant and split each payment between seller and platform, a pattern described in marketplace payments.
• Aggregators in other rails. Similar structures exist for wallets, QR payments and account-to-account schemes, where an aggregator onboards merchants under its own participation.

Card network rules require sub-merchants to be visible in the payment data rather than hidden behind the facilitator. Transactions usually carry a sub-merchant identifier assigned by the facilitator, the sub-merchant's name, location and merchant category code, and a descriptor that shows the cardholder whom they paid, often in the form of a facilitator prefix plus the sub-merchant name, as described under soft descriptor. Accurate data lets issuers assess risk and lets networks monitor fraud and disputes at the level of the actual seller.

The facilitator is responsible for merchant onboarding of each sub-merchant, including identity and know your business checks, sanctions screening, verification of bank accounts for payouts and assessment of the business model. It must also monitor sub-merchants after onboarding for changes in volume, refund and chargeback rates, unusual transaction patterns and signs of prohibited activity. Acquirers set minimum standards, audit the facilitator's processes and may require it to terminate sub-merchants that break network rules.

A specific concern is transaction laundering, in which a sub-merchant processes payments for an undisclosed business, often an illegal or high-risk one, through an account opened for a legitimate-looking front. Facilitators use website scanning, test purchases and data analysis to detect it.

Financial responsibility flows upward. If a sub-merchant incurs chargebacks, fines or fraud losses it cannot cover, the facilitator must pay the acquirer, and the acquirer remains liable to the card networks. Facilitators therefore hold reserves, delay payouts for new accounts and cap volumes. Card network rules also limit how large a sub-merchant can become before it must sign a direct agreement with the acquirer, and restrict certain high-risk categories from being onboarded under facilitators at all.

How funds move depends on local rules. In many markets, the facilitator receives settlement from the acquirer and pays sub-merchants, which may require a payment licence or the use of the acquirer's or a bank's accounts to hold funds. In the European Union, platforms that hold funds for sellers generally need a payment licence or a licensed partner, since the commercial agent exemption under payments law has been interpreted narrowly.

For small businesses, being a sub-merchant brings fast setup, simple pricing and payments integrated into the software they already use. For platforms, it creates revenue from payments and tighter customer relationships. For the card system, it extends acceptance to merchants that acquirers would find too small to serve individually, a form of merchant aggregation. The drawbacks are concentrated risk on the facilitator, less negotiating power and potential account freezes for sub-merchants, and complex compliance obligations for platforms that become facilitators.