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Writing
Notes on payment systems, device software, transaction uncertainty, platform design, and the emerging role of AI in commerce. I write from the questions that appear in real operating conditions.
Payment Services Directive 3 and the Payment Services Regulation land in staggered dates through 2027. Here's what merchant integrators need to prepare for now.
Verification of payee became mandatory across SEPA in October 2025. The first months in the field show a predictable pattern of edge cases.
The Federal Reserve's instant payment service crossed its third live year in July 2026. Adoption looks different from what the launch materials promised.
The last mile of a cross-border transaction still fails in predictable ways. A field taxonomy.
Regional QR interoperability is real, but the fine print keeps the promise from arriving evenly across markets.
Below a certain volume, the chargeback loss isn't the problem — the response cost is. What a defensible response process looks like.
NPCI's cross-border UPI push is on. What the receiving markets are learning about live-integrated retail payments from India.
The interchange bill is the visible part. What actually shows up on the underlying scheme fee statement is where the interesting rebalancing is happening.
The digital payments story misses the operator on the corner. Some design considerations for cash-out that don't come up in western integrations.
What the year's CNP fraud looked like — signal patterns, response effectiveness, and where the loss actually landed.