Payment Glossary: 70+ Payment Terms and Definitions for 2026

A payment API connects checkout systems to gateways, processors, and banks so transactions, declines, and refunds move in real time. Strong API design supports smarter routing and better recovery from failed payments.

payments API, payment processing API, payments interface

Cascading automatically sends a declined transaction to another processor or acquirer during checkout. Used well, it can recover soft declines and reduce revenue loss from outages or routing gaps.

payment cascading, cascaded payment processing, multi-acquirer cascading

Dispute resolution is the post-settlement process for handling contested card payments. Strong execution helps merchants limit revenue loss, control fees, and protect processor standing.

chargeback management, dispute process, payment dispute handling

Failover automatically reroutes transactions to a backup processor when the primary path fails. It helps merchants protect checkout continuity, reduce revenue loss, and avoid technical payment disruptions.

payment failover, processor failover, gateway failover

A high-risk merchant is a business banks and processors treat with tighter controls, higher fees, and more scrutiny, often leading to lower approval rates and reserve requirements.

high-risk business, high-risk merchant account, high-risk MCC merchant

Load balancing spreads transactions across multiple processors or acquirers so checkout stays available during spikes or outages. It helps reduce technical failures and protect revenue.

payment traffic distribution, transaction load distribution, processor load balancing

A payment processor routes transaction data between merchants, card networks, and issuers. Its uptime, data quality, and routing logic can affect approvals, costs, and resilience.

card processor, payment processing engine, processor