https://paytuning.com/ Essays on payment performance: authorization rates, orchestration, interchange economics, fraud, ledger design and cross-border rails. en https://paytuning.com/building-a-payments-ledger/ https://paytuning.com/building-a-payments-ledger/ Fri, 27 Feb 2026 00:00:00 +0000 Engineering Every fintech eventually discovers that its database is not a ledger. Here are the invariants that separate systems you can trust with money from ones you cannot. https://paytuning.com/payment-fraud-modern-playbook/ https://paytuning.com/payment-fraud-modern-playbook/ Tue, 24 Feb 2026 00:00:00 +0000 Risk & Fraud Fraud has industrialised. Account takeover, synthetic identity, first-party fraud, and authorized push payment scams each demand different defences — and blocking more is not the goal. https://paytuning.com/stablecoins-in-cross-border-payments/ https://paytuning.com/stablecoins-in-cross-border-payments/ Tue, 17 Feb 2026 00:00:00 +0000 Digital Assets Stablecoins have found genuine product-market fit in a narrow band of cross-border flows. Understanding exactly where — and why — matters more than the ideology. https://paytuning.com/authorization-rate-optimization/ https://paytuning.com/authorization-rate-optimization/ Tue, 10 Feb 2026 00:00:00 +0000 Payments Operations A one-point lift in authorization rate outperforms most growth initiatives. Here is the systematic playbook for finding and fixing false declines. https://paytuning.com/payment-orchestration-multi-processor/ https://paytuning.com/payment-orchestration-multi-processor/ Fri, 06 Feb 2026 00:00:00 +0000 Payments Operations Orchestration promises redundancy, better rates, and global reach. It also multiplies operational complexity. Here is how to judge whether you are ready. https://paytuning.com/how-payment-rails-actually-work/ https://paytuning.com/how-payment-rails-actually-work/ Tue, 03 Feb 2026 00:00:00 +0000 Payments Infrastructure A ground-level tour of the four-party model, authorization, clearing, and settlement — and why money that looks instant to the shopper takes days to actually move. https://paytuning.com/interchange-economics-explained/ https://paytuning.com/interchange-economics-explained/ Tue, 27 Jan 2026 00:00:00 +0000 Payments Economics Interchange is the largest line item in card acceptance and the least understood. Here is how it is set, why it varies so wildly, and what regulation has and has not changed. https://paytuning.com/embedded-finance-distribution-shift/ https://paytuning.com/embedded-finance-distribution-shift/ Mon, 19 Jan 2026 00:00:00 +0000 Fintech Strategy Financial products are migrating into the software where work already happens. That relocation changes who owns the customer, who carries the risk, and where the margin lands. https://paytuning.com/bnpl-credit-cycle-reckoning/ https://paytuning.com/bnpl-credit-cycle-reckoning/ Mon, 12 Jan 2026 00:00:00 +0000 Consumer Credit BNPL grew up in an era of cheap funding and benign credit. Now it faces regulation, funding costs, and its first real test of underwriting quality. https://paytuning.com/open-banking-account-to-account/ https://paytuning.com/open-banking-account-to-account/ Mon, 05 Jan 2026 00:00:00 +0000 Payments Infrastructure Bank-to-bank payments were supposed to disrupt cards. In some markets they did decisively, in others they stalled — and the difference reveals what actually drives payment adoption.