Paying.co The Payment Stack Blog

unattended

Payment Approved, Machine Didn't Start: Designing Recovery for Unattended Payments

Treat authorization, physical activation, and fulfillment confirmation as three separate events

Kevin Medina Oct 18, 2026 3 min read

AI, Payment Operations

AI for Payment Operations: Three Workflows Worth Automating First

Start with workflows that are repetitive, text heavy, easy to check, and reversible:

Kevin Medina Oct 18, 2026 2 min read

Payment Engineering, Modernization

Modernizing a Legacy Payment Application Without Rebuilding Everything

Start by inventorying what the legacy app actually depends on, then replace it in slices instead of all at once.

Kevin Medina Oct 18, 2026 3 min read

oracle

Integrating Payments into Oracle Simphony: Questions to Resolve Before Development

Before development starts, settle which Simphony payment interface your integration will use, who supplies the payment service provider (PSP) side, and which parts of the flow you own.

Kevin Medina Oct 18, 2026 3 min read

EMV Certification, Payment Engineering

Managed EMV Certification vs. Full Payment Application Development

Choose managed EMV certification when you already have a payment app or integration and need help getting it tested, documented, and approved.

Kevin Medina Oct 18, 2026 2 min read

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

unattended payments

How to Add Card Payments to Existing Laundry Machines

Start with the machine, not the card reader. Before you buy anything, identify each washer and dryer's model, its controller, and the payment interface it supports.

Kevin Medina Oct 18, 2026 3 min read

Vending, Unattended Payments, MDB, Contactless Payments, Payment Engineering, EMV, SoftPOS, Vending Technology

MDB vs. Pulse: Which Interface Does Your Machine Need?

MDB vs Pulse: which interface does your machine need?

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

Notes on payment engineering, EMV certification, and building the infrastructure businesses run on.

What is an EMV level 3 certification?

Latest posts

Payment Approved, Machine Didn't Start: Designing Recovery for Unattended Payments

AI for Payment Operations: Three Workflows Worth Automating First

Modernizing a Legacy Payment Application Without Rebuilding Everything

Integrating Payments into Oracle Simphony: Questions to Resolve Before Development

Managed EMV Certification vs. Full Payment Application Development

Payment Application Testing Checklist: Beyond Approved and Declined

Dedicated Payment Engineering Team vs. Hiring In-House

Payment Gateway Integration: Scope, Timeline, and Hidden Dependencies

How to Add Card Payments to Existing Laundry Machines

MDB vs. Pulse: Which Interface Does Your Machine Need?

Native Android vs. Flutter or React Native for Payment Applications

Notes on payment engineering, EMV certification, and building the infrastructure businesses run on.

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