Educational Guide
A payment processor is a company that manages the technical and financial steps required to move money from a customer's bank to a merchant's bank when a card transaction occurs. Every time a customer swipes, taps, or enters a card number online, a payment processor is working in the background — handling authorization, routing, settlement, and funding.
Last updated: June 17, 2026
Quick Answer
A payment processor is a company that manages the technical and financial steps required to move money from a customer's bank to a merchant's account when a card transaction occurs — handling authorization, settlement, and funding. When choosing a processor, evaluate pricing model, business-type fit, contract terms, and payout speed.
Payment processors perform four core functions on every transaction: authorization, capture, settlement, and funding.
Authorization is the process of verifying that a cardholder has sufficient funds or credit available, and requesting approval from the issuing bank. Capture confirms the transaction amount once the customer has completed the purchase. Settlement is the batching and submission of completed transactions for final payment. Funding is the deposit of settled funds into the merchant's bank account, typically 1–3 business days after settlement.
Understanding the payment flow helps merchants evaluate processor speed, reliability, and cost structure.
Note: The entire authorization step typically completes in 1–3 seconds. Settlement and funding take 1–3 business days with most processors.
Not all payment processors are structured the same way. The three most common models affect how merchants are onboarded, priced, and supported.
Direct acquirers hold their own banking licenses and process transactions on behalf of merchants using their own infrastructure. Examples include Chase Payment Solutions and Elavon. Merchants typically get a dedicated merchant account.
Payment facilitators (PayFacs) and aggregators process transactions under a single master merchant account, with individual businesses treated as sub-merchants. This allows faster signup and simpler onboarding but may offer less flexibility for complex businesses. Square, Stripe, and PayPal operate as PayFacs.
Independent Sales Organizations (ISOs) resell processing services from a larger acquirer or processor under their own brand. Many regional merchant services companies are ISOs.
These three terms are often confused because many modern processors bundle all three services together.
A payment processor handles the authorization, settlement, and fund movement for card transactions. A payment gateway is software that securely transmits card data from a checkout form or terminal to the processor — it handles encryption and routing, not fund movement. A merchant account is the bank account that temporarily holds settled funds before they are transferred to the merchant's primary business bank account.
With many modern processors (Stripe, Square, Helcim), all three are bundled into a single product. With traditional merchant services, you may have separate relationships for each.
The right processor depends on your business type, sales channel, processing volume, and approval requirements.
Note: Always verify pricing, contract terms, and approval requirements directly with the processor before signing any agreement.
These are the most common errors merchants make when selecting or working with a payment processor:
Use this checklist before selecting a payment processor:
A payment gateway securely transmits card data from a checkout form or terminal to the payment processor — it handles encryption and routing. A payment processor handles the authorization, settlement, and fund movement. Many modern processors bundle gateway functionality into their service.
Not necessarily. Payment facilitators like Stripe and Square provide access to processing without a dedicated individual merchant account — your business processes under their master account. Traditional processors provide a dedicated merchant account. Dedicated accounts generally offer more underwriting flexibility for complex businesses.
A payment aggregator (or PayFac) processes payments on behalf of multiple sub-merchants under one master merchant account. Square, Stripe, and PayPal are examples. Aggregators offer fast signup and simple onboarding but may have less flexibility for higher-risk or complex business types.
Approval time varies by processor and business type. PayFacs like Stripe and Square typically approve accounts instantly or within hours. Traditional merchant account providers may take 1–5 business days for standard underwriting, or longer for complex business types.
Use Fit Check to identify providers that may deserve closer research based on your business profile, or open the Cost Calculator to estimate your fees.