How to calculate customer usage for billing
A customer opens their invoice and asks why it's higher than last month. Answering that question requires tracing a number on a PDF back through pri…
Architecture
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Architecting Bulletproof SaaS Billing with Stripe: Webhooks, Proration, and Usage Metrics
Architecting Bulletproof SaaS Billing with Stripe Building a SaaS product is a marathon, but billing is where developers often trip over their own s…
Subscription Billing and Plans
Last time, in Accepting Payments with Stripe , I covered the part everyone assumes is the hard bit: taking a card and moving money. It isn't, really…
Next.js Stripe Billing Integration for SaaS (Step-by-Step Guide)
Creating a B2B SaaS application involves a number of challenges. One of the challenges facing entrepreneurs and businesses is the time required to d…
How to design pricing for AI APIs and LLM-powered products
AI API pricing comes down to six decisions, in order: what to meter, which primitive to charge for, what to charge per unit, how to structure tiers,…
Stripe and Friendly Fraud: What the HN Crowd Got Right — and What Progenix Does About It
If you were on Hacker News yesterday, you saw it. A detailed post-mortem from a merchant who lost thousands of dollars to friendly fraud — customers…