payment-systems

Paying At The Pump: Why Auth and Preauth Are Not The Same Thing

And how it affects implementing new payment methods that look "similar" from the outside

Aug 20 •

Testable Payment Webhooks

PSPs are prioritizing their engineers' experience above anyone else's

Aug 6 •

The Joy of Being On Call For Payment Systems

How to be at ease when every second counts

Jul 16 •

Why Payments Are Path-Dependent

A winning strategy to go around DNHs and improve payments authorization

Jul 2 •

Code-First Reliability in Payment Systems

Building Payments to fail as soon as possible

Jun 25 •

Why Payments Aren't Money Movements

Payments are contracts, and require an ecosystem of tools on top of transfers

Jun 18 •

5 Common Antipatterns in Payment Systems Design

They're sensible approaches that end up becoming major obstacles for scale and maintenance down the road.

Apr 23 •

Payment Cards Are An Insecure Protocol

Adopting modern encryption to credit card payments

Nov 6, 2024 •

The Most Important Book In Payments Is a Data Systems Book

Challenging the belief that good software design isolates business concerns on the domain layer.

Sep 4, 2024 •

Exactly-Once Payments At Airbnb

Eventually consistent databases make it really hard to ensure that payments are made only once. Idempotency and clever retries make it possible.

Aug 14, 2024 •

Cringey, But True: How Uber Tests Payments In Production

Well-run payment systems are developed by engineers who understand what is the best use of their time: to catch unknown unknowns, and to do it fast.

Aug 7, 2024 •

Stripe Made The Obvious Choice When Building Its Payments API. It Took Two Years To Fix It.

Going from a single Charge object to represent a payment to a dual PaymentIntent/PaymentMethod was a feat of engineering, and a lesson on how to be…

Jul 31, 2024 •

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