Merchant Aggregation

Merchant aggregation is a model of card acceptance in which a single provider contracts with an acquirer and then offers card payments to many smaller businesses under that relationship, rather than each business opening its own merchant account with the acquirer. The provider, often called an aggregator, onboards the businesses, receives the funds from their card sales and pays them out. Aggregation is what lets a market trader, a freelancer or a small online shop start accepting cards within minutes.

Card networks today mostly describe these providers as payment facilitators, and the businesses they serve as sub-merchants or sponsored merchants. The term merchant aggregation is still widely used, especially for the general idea and in markets such as India, where the regulator uses the term payment aggregator for licensed firms that perform this role.

In a traditional setup, every merchant signs an agreement with an acquirer, which underwrites it individually and settles funds to it directly. In an aggregated setup, the aggregator holds the master relationship with the acquirer and takes on much of the acquirer's work:

• Onboarding. The aggregator collects information on each sub-merchant, carries out identity and business checks and approves it, usually through a fast online merchant onboarding workflow.
• Processing. Transactions are submitted through the aggregator's platform to the acquirer, identified by the aggregator and the individual sub-merchant.
• Settlement. The acquirer settles funds to the aggregator, which then pays each sub-merchant its share after fees, or the acquirer pays sub-merchants directly on the aggregator's instructions.
• Risk management. The aggregator monitors sub-merchants for fraud, chargebacks and prohibited activity and handles disputes.

The acquirer remains responsible to the card networks for all transactions, including those of sub-merchants it has never met, so it oversees the aggregator closely and may hold reserves against its portfolio.

Card networks once discouraged aggregation because it hid the true merchant behind a third party. They later created formal frameworks for it. Under these rules the aggregator must be sponsored by an acquirer and registered with the network, a process described under payment facilitator registration. Each transaction must carry details that identify the actual sub-merchant, such as its name and correct merchant category code, so that cardholders recognise the charge and networks can monitor activity.

Networks also set limits on aggregation. Sub-merchants whose card volume grows above thresholds set by the network may need their own direct agreement with the acquirer, and some high-risk business types cannot be aggregated at all. Marketplaces that sell goods on behalf of many sellers may instead operate as the merchant of record, a related but different model in which the platform itself is the seller in the eyes of the cardholder.

Beyond card network rules, aggregators may be regulated because they hold and pass on customer funds. In the European Union and United Kingdom, a business that receives funds for merchants generally needs a payment institution licence or must rely on an exemption, such as the commercial agent exclusion, which is interpreted narrowly. In India, the Reserve Bank of India requires payment aggregators to be authorised, meet capital requirements and hold merchant funds in escrow accounts. In the United States, aggregators usually rely on their acquiring bank relationships and on agent-of-the-payee arguments under state money transmission laws, though the position varies by state.

Aggregation lowers the barriers to accepting cards. Small merchants avoid lengthy applications, credit checks and fixed monthly fees, and often pay a simple flat rate per transaction. Software platforms gain a new revenue line by embedding payments into the tools their customers already use, and acquirers reach large numbers of small businesses they could not serve profitably one by one.

Because onboarding is quick and checks are lighter, aggregation is attractive to fraudsters. Bad actors may sign up as sub-merchants, process stolen cards and disappear before chargebacks arrive, leaving the aggregator with the losses. Aggregators can also be used for transaction laundering, where an approved business processes payments for a hidden, often illegal, one. To control these risks, aggregators combine merchant underwriting rules, ongoing monitoring of sales patterns, delayed payouts for new sub-merchants and rolling reserves, and they review sub-merchants that move into high-risk merchant categories.