payment engineering

Payment Engineering, QA and Testing

Payment Application Testing Checklist: Beyond Approved and Declined

Test a payment app by lifecycle, not just by outcome.

Kevin Medina Oct 18, 2026 3 min read

payment engineering

Dedicated Payment Engineering Team vs. Hiring In-House

Hire in-house when payments is your core product and you can fund a permanent team for the long term

Kevin Medina Oct 18, 2026 3 min read

payment engineering

Payment Gateway Integration: Scope, Timeline, and Hidden Dependencies

A gateway integration is more than calling an API. Scope it by the transaction lifecycle you must support, the environments and approvals you need, and the operations around the money:

Kevin Medina Oct 18, 2026 3 min read

payment engineering

Native Android vs. Flutter or React Native for Payment Applications

Use native Android when your app runs on a dedicated payment terminal or depends on a vendor SDK. Consider Flutter or React Native for consumer checkout apps where the processor offers a supported SDK or plugin.

Kevin Medina Oct 18, 2026 3 min read

How Much Does a Custom Payment App Cost to Build?

There is no honest single number. A custom payment app costs whatever its hardest dependency costs: usually the device SDK, the processor integration, and certification, not the screens.

Kevin Medina Oct 18, 2026 4 min read

EMV Level 3 Certification on Worldpay: What ISVs and Terminal Manufacturers Need to Know

Worldpay. Certified faster. Same problem as always, different processor → get a payment application through Level 3 certification without it costing your team a year of engineering time.

Kevin Medina Sep 23, 2026 3 min read

EMV

Payment Engineering, On Demand

Your developers know your application inside out. Payments shouldn't be the thing that slows them down.

Kevin Medina Jun 3, 2026 3 min read