Building thoughtful software with AI.Notes from the systems behind the work.
A refunded pack whose credits were already spent had nowhere to go, so accounts got a separate debt counter and every incoming credit now pays that debt before it becomes spendable.
Read moreThree billing calls in my admin app built their duplicate-protection keys from the current time, so a retried request never matched the first try, and the one test that pinned an exact key had to freeze the clock to pass.
Swapping a local copy of billing state for plan entitlements in the session was the right call, but it left the free-tier seat cap answered by three pieces of code that disagree, a random retry key on customer creation, signup that now depends on the payment provider, and billing endpoints that trust whatever organization the request names.
The lookup that decided whether an organization already had a payment customer searched by an email my code sometimes guessed or generated, and could hand one org's billing record to another. I moved identity onto the identity provider's org ID and tied retries to it, but the same commit left an ignored retry flag, a delete check that reads error wording, a gutted seat counter, and no tests.