Start with processor compatibility

  • Confirm which processors and acquiring routes the gateway supports.
  • A gateway may support different features on different processor connections.
  • Device and transaction-type certifications should be verified.
  • Do not assume a gateway can be moved unchanged between processors.

Review security architecture

  • Use tokenization to reduce exposure to stored card data.
  • Hosted payment pages or fields can reduce direct handling of sensitive payment information.
  • Role-based permissions and audit controls matter for staff access.
  • PCI scope should be reviewed with the merchant's actual integration model in mind.

Evaluate transaction workflows

  • Confirm support for auth-only, capture, void, refund and recurring transactions.
  • B2B merchants should review Level II and Level III data support where relevant.
  • Ecommerce businesses may need fraud tools, account updater and stored credentials.
  • Partial capture and delayed fulfillment workflows should be tested before launch.

Look closely at APIs and integrations

  • Documentation quality matters for development teams.
  • Webhooks, reporting APIs and token portability may affect long-term flexibility.
  • ERP, ecommerce and software integrations should be tested on the intended processor route.
  • Ownership of integration support should be clear.

Compare support and operational visibility

  • Merchants should know who supports gateway outages, settlement issues and integration questions.
  • Transaction-level reporting should make troubleshooting possible.
  • A secure gateway is most useful when the merchant can also operate and support it effectively.