Paying.co The Payment Stack Blog (Page 2)

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

certification

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

TSYS. Certified faster. Same certification problem, same discipline required, this time on one of the largest acquiring processors in the industry.

Kevin Medina Sep 23, 2026 3 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

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

Rapid Connect. Certified faster. It's a good line because it's the whole problem in four words → certification is usually the thing standing between a working terminal and a live merchant.

Kevin Medina Sep 23, 2026 2 min read

PCI MPoC Certification in 90 Days — Guaranteed by Paying.co

Tap-to-phone is the fastest-growing acceptance category in payments, and PCI MPoC is the standard that gates it. 192 individual security requirements. Accredited labs. Mandatory annual penetration tests. Visa and Mastercard mandates already in effect.

Kevin Medina Sep 7, 2026 5 min read

Healthcare Technology: built for care environments, engineered to hold up

Paying.co builds healthcare payment technology and infrastructure for hospitals, senior living operators, pharmacies, and health-tech vendors.

Kevin Medina Sep 7, 2026 3 min read

PCICompliance

Before you spend, spend an hour with us. Get it right the first time.

Payment Systems & Secure Solutions Consulting: the decision that saves you six months

Kevin Medina Sep 7, 2026 3 min read

Flaw.co: security inside and out, built by Paying.co

Code reviews what you're building from the inside. Detect examines what you're exposing from the outside.

Kevin Medina Sep 7, 2026 3 min read

Unclear.ai: Transaction Intelligence, engineered by Paying.co

Every transaction begins unclear. The job isn't to guess faster — it's to understand, and to be able to say why.

Kevin Medina Sep 7, 2026 4 min read

roomwork

Roomwork: the connected workspace engineered by Paying.co

Roomwork is a full project and team operations platform, built in-house by Paying.co and powered by Rōrk, its built-in AI assistant. Instead of learning a new tool, you just ask in plain language what needs your attention — Rōrk filters by due date, status, project, or assignee

Kevin Medina Sep 7, 2026 4 min read

EMV

EMV Level 2 Certification, Explained

Every chip-card transaction you have ever tapped or inserted passed through a piece of software you never see: the EMV kernel. EMV Level 2 certification is what proves that kernel works correctly and securely before a terminal is ever allowed near a live card.

Kevin Medina Jul 10, 2026 7 min read

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

What is an EMV level 3 certification?

Latest posts

How Much Does a Custom Payment App Cost to Build?

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

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

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

PCI MPoC Certification in 90 Days — Guaranteed by Paying.co

Healthcare Technology: built for care environments, engineered to hold up

Before you spend, spend an hour with us. Get it right the first time.

Flaw.co: security inside and out, built by Paying.co

Unclear.ai: Transaction Intelligence, engineered by Paying.co

Roomwork: the connected workspace engineered by Paying.co

EMV Level 2 Certification, Explained

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

Latest posts

Get new posts by email.