Sub-merchant

A sub-merchant is a business that has been onboarded by a Payment Facilitator (PayFac) to accept card payments under the PayFac's master merchant account, rather than establishing a direct relationship with an acquiring bank. The PayFac assumes responsibility for underwriting, compliance, and settlement on behalf of its sub-merchants.

In a sub-merchant arrangement, the sub-merchant does not have its own Merchant Identification Number (MID) issued directly by an acquirer. Instead, transactions are processed under the PayFac's master MID, with the PayFac responsible for allocating funds, managing disputes, and monitoring for fraud across its entire portfolio of sub-merchants. Card networks require PayFacs to register and take accountability for the sub-merchants they onboard.

The primary advantage for sub-merchants is speed and simplicity. A business can begin accepting payments within days, sometimes hours, rather than going through the weeks-long underwriting process required to establish a direct merchant account. This is why the sub-merchant model is common in SaaS platforms, marketplaces, and vertical software companies that embed payments as a feature for their customers.

The tradeoff is reduced control and potentially higher fees. Because the PayFac absorbs risk across its portfolio, it tends to apply conservative fraud and chargeback policies and takes a margin on processing. Sub-merchants who grow to significant transaction volumes often find it worthwhile to graduate to their own merchant account or explore Payfac-as-a-Service models that give them more control.