# What is a payment processor?

URL: https://www.paydude.io/resources/what-is-a-payment-processor
Type: Guide
Published: 2026-09-02 · Updated: 2026-09-02
Summary: A processor, a gateway, an acquirer and a merchant account are four different things. What each does, and which you actually need.

## Summary

A gateway captures card details; a processor moves the money. An acquirer is the bank that actually holds your funds. Modern providers bundle all of these into one signup. You need a merchant account, but usually not one you open yourself.

Four different things get called "the payment processor", and mixing them up is why comparing providers is confusing.

## The four roles

**Who does what in a card payment**

| Role | What it does |
| --- | --- |
| Gateway | Captures and encrypts card details at checkout |
| Processor | Routes the transaction through the card networks |
| Acquirer | The bank that receives and holds the funds |
| Merchant account | The account the money lands in before payout |

Traditionally you assembled these separately. Modern providers bundle all four behind one signup, which is why you can start taking payments the same day rather than waiting weeks for underwriting.

## Where your money goes

Every card payment splits three ways: interchange to the issuing bank, an assessment to the card network, and the remainder as processor margin. Only that last part differs between providers — see [credit card processing fees, explained](https://www.paydude.io/resources/credit-card-processing-fees-explained).

*[Interactive calculator: https://www.paydude.io/resources/tools/payment-fee-impact-calculator]*

**Published rates, no sales call** — [See Paydude pricing](https://www.paydude.io/pricing)

## Frequently asked questions

### What is the difference between a payment gateway and a payment processor?

The gateway captures and encrypts card details at checkout and passes them on. The processor moves the transaction through the card networks to the customer's bank and back. Most modern providers bundle both, which is why the terms are used interchangeably.

### Do I need a merchant account?

You need one, but with most modern providers you do not open one yourself. Aggregators place you under their own master merchant account, which is why signup takes minutes rather than weeks.

### Who actually takes the money?

Three parties. Interchange goes to the bank that issued the customer's card, an assessment goes to the card network, and the remainder is the processor's margin. Only the last is negotiable.