Paying.co Blog

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

Field notes from the team behind 131+ EMV Level 3 certifications — on unattended systems, SoftPOS, AI in payments, and what actually ships.

What is an EMV level 3 certification?
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What is an EMV level 3 certification?

Understanding EMV Level 3 Certification: A Complete Guide If you've ever used a chip card at a payment terminal, you've interacted with

· Jan 17, 2026 · 4 min read

Latest posts

64 posts
Understanding MDB Levels and How They Shape Vending Payments
vending

Understanding MDB Levels and How They Shape Vending Payments

A practical guide to MDB Levels 1, 2, and 3, the protocol that governs how your vending machine handles payment. Learn how each level shapes transaction speed, user flow, and the contactless tap-to-pay experience, and which one to target.

Kevin Medina Kevin Medina 3 min read
Built by Payment Engineers, For Payment Engineers: The Paying.co Developer Toolkit
Developer Tools, EMV, Payments, Open Source, Engineering

Built by Payment Engineers, For Payment Engineers: The Paying.co Developer Toolkit

Most payment platforms hand you a dashboard and a support queue. We took a different route. Paying.co puts the same parsing and decoding logic our team relies on during certification directly in your browser — free, client-side, and no sign-up.

Kevin Medina Kevin Medina 6 min read
What Is PCI Compliance? Levels, Requirements, and How to Stay Compliant (2026 Guide)
PCI Compliance

What Is PCI Compliance? Levels, Requirements, and How to Stay Compliant (2026 Guide)

If your business touches a credit card number at any point, whether you swipe it, tap it, key it in, or simply pass it to a processor, you are operating inside the world of PCI compliance. For merchants, ISVs, and payment engineers alike, understanding the Payment Card Industry Data Security..

Kevin Medina Kevin Medina 8 min read
What payment technical debt actually looks like
certification

What payment technical debt actually looks like

Most payment systems don't fail dramatically. They erode. A processor integration written in 2014 still works, so nobody touches it. A magstripe fallback path that "we'll fix next quarter" becomes load-bearing.

Jose Delgado Jose Delgado 3 min read
Payment Engineering, On Demand
EMV

Payment Engineering, On Demand

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

Kevin Medina Kevin Medina 3 min read
Is Your Recurring Billing Platform Antiquated and Quietly Killing Your Revenue
recurring billing

Is Your Recurring Billing Platform Antiquated and Quietly Killing Your Revenue

If your business runs on subscriptions, memberships, SaaS seats, or any flavor of recurring revenue, there is a number you should know cold: subscription businesses lose an estimated $129 billion every year to failed payments alone, and roughly 20 to 40 percent of all customer churn is involuntary.

Jose Delgado Jose Delgado 3 min read

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