Finishing a Payments Flow in NestJS: Events, Config, and the Limits of Pre-Checks

I'm building RunHop in public, a social + event platform for running races. Today was a cleanup-and-integration day for the payments module. The core problem wasn't creating payments. That part already existed. The real work was making payment review actually affect the rest of the system in a clean way. The Product-Level Rule There are two different registration paths: Free race: registration should be confirmed immediately Paid race: registration should stay pending until payment review is app