Payments glossary · Core
Payment Processor
A payment processor is a company that handles the technical movement of transaction data between merchants, acquirers, card networks and issuers, carrying authorisation requests and responses and submitting transactions for clearing and settlement.
How Payment Processor works
Processing is often split into two parts. Front-end processing connects the merchant's terminal or gateway to the card networks and carries authorisation requests and responses in real time. Back-end processing handles clearing and settlement after the sale, calculating what each party owes and producing the data for merchant payouts and reporting. Acquirers may do this in-house or outsource it to specialist processors, which the card schemes treat as third party agents.
In everyday use the word is loose. Merchants often call their PSP or acquirer their processor, and some large companies are processor, acquirer and gateway at once. The distinction matters when comparing providers: a pure processor or gateway may not hold a card scheme licence or your funds, whereas an acquirer or payment facilitator does and will underwrite your business.
Processing also exists outside cards. Bank transfer and direct debit processors submit payment files to clearing systems such as Bacs, Faster Payments, SEPA or ACH, and alternative payment method providers process transactions on their own rails. When evaluating a provider, ask which parts of the chain it performs itself and which it outsources, since each handover adds cost, latency and a potential point of failure.