A payment processor is a service provider that performs or coordinates transaction-processing functions between a payer, merchant, financial institution, or settlement system.
In a stablecoin payment flow, a processor can create payment instructions, monitor blockchain transactions, apply compliance controls, calculate amounts, manage conversion, reconcile transactions, and arrange merchant settlement. Some processors also provide wallets, custody, or fiat payout services. The exact functions vary by provider, so the label should be tied to the services actually performed.
A processor performs or coordinates transaction-processing functions. A payment gateway is primarily the technical interface that connects the merchant's checkout or application to those payment functions.
The processor determines many of the operational steps between payment initiation and final merchant settlement, including risk controls and reconciliation.
A merchant can send an order to a processor, which generates a stablecoin payment request, monitors receipt, converts funds if requested, and records the transaction for settlement.