Multi-Acquirer Processing

Multi-acquirer processing is an arrangement in which a merchant holds contracts with two or more acquiring banks or processors and sends each card payment to one of them according to set rules. The choice may depend on the card's country, the currency, the expected approval rate, the price of each route or whether a provider is currently working. Large online merchants, marketplaces, airlines, travel firms and subscription businesses commonly use it.

The practice depends on a routing layer, either the merchant's own or one supplied by a gateway or payment orchestration platform, that connects to several acquiring banks at once. It is closely linked to smart payment routing and to payment failover, which uses the second acquirer as a backup when the first fails. A merchant with a single acquirer, by contrast, depends on that one provider's prices, approval performance and uptime.

Picture a company that ships parcels abroad. Rather than using only one courier, it signs up with three. For parcels to Germany it uses the courier with the best local network; for urgent parcels it uses the fastest; and if one courier goes on strike, it simply hands everything to the others.

Multi-acquirer processing does the same with card payments. An acquirer is the bank that collects card payments for a shop. A shop with several acquirers can send a French customer's card to a French acquirer, which local banks tend to approve more often, send cheap transactions down the cheapest route, and keep trading if one provider has an outage. The customer sees nothing different; the choice happens in the background in a fraction of a second.

• Higher approval rates. Issuers often approve domestic transactions more readily than cross-border ones, so routing a card to an acquirer in the cardholder's country, known as local acquiring, can reduce declines.
• Lower cost. Acquirer markups, cross-border fees and interchange differ between domestic and foreign processing, and between pricing models such as interchange-plus pricing and blended rates.
• Resilience. If one acquirer's platform has an outage, traffic can move to another.
• Bargaining power. A merchant that can shift volume between providers negotiates better prices and service.
• Coverage. Some acquirers support local card brands, currencies or payment methods that others do not.
• Risk capacity. High-volume or higher-risk merchants may spread volume to stay within each acquirer's risk appetite, reserve requirements and chargeback ratio thresholds.

When a customer pays, the routing layer reads the transaction details, such as the card's BIN range (which reveals the issuer's country and card type), amount, currency and merchant entity, and applies rules or a scoring model. The merchant measures each route's performance using the authorization approval rate:

For example, if Acquirer A approved 9,420 of 10,000 attempts on UK cards (94.2%) and Acquirer B approved 9,610 of 10,000 (96.1%), the router may favour B for UK cards, provided B's price does not cancel out the gain. On a $5 million monthly UK volume, an extra 1.9 percentage points of approvals is roughly $95,000 of sales that would otherwise have been declined, before allowing for customers who would have retried.

Some routers also retry a declined transaction with a second acquirer. This is allowed for certain technical errors and some soft declines, but card networks restrict retries of a hard decline and limit the number of reattempts, and excessive retrying can draw fees and scrutiny.

• Several contracts. Each acquirer requires its own underwriting, merchant account, reporting and fees, and often minimum volumes.
• Card data portability. To route stored cards freely, the merchant needs card data that every acquirer can use. This is usually solved with a vault that is compliant with PCI DSS, or with network tokens that are not tied to one acquirer.
• Reconciliation. Settlements, fees, refunds and disputes arrive from each acquirer in different formats and on different schedules, which complicates finance work.
• Dispute handling. A refund or chargeback must be processed through the acquirer that handled the original sale, so the router must remember which route each payment took.
• Licensing and entity issues. Local acquiring often requires a local legal entity or a merchant of record in each country.

Multi-acquirer processing is a merchant-level strategy. A payment facilitator may itself use several acquirers to serve its sub-merchants, but the sub-merchant usually sees only the facilitator. Debit routing in the United States is a different concept: it concerns which debit network carries a transaction, as required by the Durbin Amendment rules, not which acquirer receives it. Least cost routing can be applied at either level. Payment orchestration platforms bundle multi-acquirer connections with routing, tokenization and reporting as a service.

• PCI Security Standards Council
• EMVCo