Merchant Account

How it works

A merchant account connects three parties: the merchant, the acquiring bank that holds the account, and the card networks (Like Visa, Mastercard, Discover, and American Express). When a customer pays, the acquirer fronts the funds and later collects from the issuing bank through the network. The acquirer takes ownership of the transaction risk in, while in exchange takes fees and has the ability to take contractual recourse against the merchant.

Why it matters for high-risk merchants

For regular (low-risk) merchants the account is mostly invisible: open it, plug in a gateway, get paid the next day. High-risk merchants face a different reality. Underwriting can take 1 to 4 weeks instead of minutes. Approved accounts often carry 4% to 8% effective rates instead of the 2.9% baseline, and most include a rolling reserve of 5% to 15% held for 6 to 12 months to offset chargeback and refund risk.

Examples

• Dedicated merchant account at a sponsor bank (most stable, typically required for high-risk verticals).
• Aggregated account through Stripe, Square, or PayPal (fast onboarding, weak fit for high-risk verticals).
• ISO or MSP-resold account at a sponsor bank (the format most processors actually sell).
• Sub-merchant arrangement under a payment facilitator (Mastercard caps these at under $1M annual volume before the sub-merchant must hold its own account).

Common pitfalls

• Treating a Stripe or Square account as equivalent to a dedicated merchant account. Aggregators reserve the right to suspend or off-board without warning when risk patterns shift.
• Underestimating the cash flow impact of a rolling reserve. A 10% reserve held for 6 months ties up roughly 5% of annual revenue at any given time.
• Triggering placement on the Mastercard MATCH list after a termination for cause, which blocks future merchant accounts across participating acquirers for five years.