Production Billing System Blueprint
Build payment systems that actually work.
A 100+ page guide covering event sourcing, payment state machines, reconciliation patterns, multi-currency handling, and invoice lifecycle management. Based on real production systems serving 100M+ users.
Inside the guide
What You'll Learn
Event Sourcing Ledger
Double-entry accounting with event sourcing. Every transaction is an immutable event.
Payment State Machines
11-state payment lifecycle: created → authorized → captured → settled → reconciled.
Multi-Currency
Exchange rates, rounding rules, settlement currencies, FX hedging patterns.
Reconciliation
Automated bank reconciliation: match, flag, resolve discrepancies.
Invoice Lifecycle
Draft → sent → partially paid → paid → overdue → written off.
Production Patterns
Idempotency keys, retry with backoff, dead letter queues, audit trails.
Table of Contents
Who This Is For
Written by engineers, for engineers
Senior Engineer
Building production systems and tired of re-inventing the wheel on every project.
Software Architect
Needs battle-tested patterns to back architectural decisions with evidence.
Startup CTO
Must ship fast without accumulating technical debt that kills you later.
The Problem
Most billing tutorials cover only Stripe checkout — not the hard parts
Event sourcing for payments is poorly documented online
Production reconciliation patterns are locked behind enterprise consultants
Get Instant Access
One-time payment. Instant PDF download.
Personal License
- 100+ page PDF
- Architecture diagrams
- Code examples (Python + TypeScript)
- Lifetime updates
Team License
- Everything in Personal
- Up to 10 team members
- Slack discussion channel
- Priority Q&A
Frequently Asked Questions
What language are code examples in?
Python (FastAPI) and TypeScript (Node.js). Patterns are language-agnostic.
Is this about Stripe integration?
No. This covers the system design behind billing — applicable regardless of payment provider.
Do I get updates?
Yes. Lifetime updates included. New patterns added quarterly.