Accrual and engineering patterns
Recognition over time, releases, dedup keys.
6 hands-on lessons in this topic. Read each one free, then practice it on a real double-entry ledger in the lab.
- Lesson 10
Deferred revenue
Why annual subscriptions cannot all hit January's revenue.
- Lesson 11
The chargeback lifecycle
Provisional reserves, the resolution, and the moment money becomes a loss.
- Lesson 12
Idempotency at the ledger boundary
How webhook retries silently double-book your fintech.
- Lesson 13
Failed transaction: releasing the hold
Every reservation needs a release path, or pending lives forever.
- Lesson 14
Interest accrual
Earning interest daily, paying it monthly. The gap matters.
- Lesson 15
Period close
How the P&L resets to zero while the balance sheet carries on.