The short answer
A payment facilitator (PayFac) is a Visa/Mastercard-registered entity that maintains a direct relationship with an acquiring bank and sub-merchants other businesses under its master merchant account. Stripe is the defining modern PayFac. Square, PayPal, Adyen for Platforms, Braintree (Marketplaces), Shopify Payments, and Checkout.com are all PayFacs. The model exists because traditional merchant-account onboarding is slow (days-to-weeks of underwriting); PayFacs compress that to minutes by absorbing the underwriting risk themselves and onboarding sub-merchants under their umbrella.
How it works mechanically
- The PayFac registers with Visa and Mastercard as a payment facilitator and signs a sponsorship agreement with an acquiring bank (Stripe's is Wells Fargo + Citibank; Square's is Wells Fargo).
- The acquirer issues the PayFac one master MID.
- The PayFac builds onboarding, KYB/KYC, and risk tooling to onboard sub-merchants under that MID.
- Sub-merchants transact under the master MID; card networks see the PayFac as the merchant of record, with the sub-merchant as an attribute on each transaction.
- The acquirer funds the PayFac; the PayFac funds sub-merchants per its own payout schedule.
What operators need to know
- Offboarding risk is real. Every PayFac reserves the right to terminate sub-merchants with minimal notice. The restricted-business lists (published by Stripe, PayPal, Square) exclude broad verticals — nutra, peptides, SARMs, CBD, firearms, adult, gambling, subscription traps. Falling afoul of a PayFac's risk team is the most common payments incident in multi-brand operator portfolios.
- PayFac dollar-volume migration. Visa requires sub-merchants above $1M/year to either migrate to a direct merchant account or be underwritten as a "high-volume sub-merchant" with extra scrutiny. Most PayFacs automate this migration, but it triggers fresh KYC.
- Pricing is flat and opaque. PayFacs quote 2.9% + $0.30 (or similar blended rate) regardless of actual interchange category. On debit or regulated cards, your true cost is 60–100 bps lower. That margin flows to the PayFac, not you. At volume, interchange-plus at a parent merchant account beats PayFac pricing by 80–120 bps.
- Descriptor control is limited. PayFacs usually enforce a prefix format ("SQ *", "PYPL *", "SP *") on every descriptor. Customer sees your brand after the prefix, not as the primary line. Higher chargeback ratios often correlate.
PayFac vs. ISO vs. acquirer
An acquirer is the bank that holds the Visa/Mastercard merchant relationship (Chase, WorldPay, Elavon, Worldpay from FIS). An ISO (Independent Sales Organization) resells acquirer services and handles merchant setup, but doesn't hold the merchant account itself — the merchant has a direct account at the acquirer, with the ISO as the introducer. A PayFac is the third model: the PayFac holds the master MID and sub-merchants others beneath it. multiflow operates closer to the ISO model, introducing operators to acquirers where each operator holds their own parent merchant account, not a sub-merchant relationship under us.