Part 5: Campaign Architecture — Surviving the 10-Billion Yen Surge & Virtual Waiting Rooms
Previous Chapter: Part 4 — SRE Practices & Chaos Engineering | Series Hub | Next Chapter: Part 6 — AI Platform: Real-Time Fraud & LLM Hub Answer-first: Handling viral traffic spikes during nationwide cashback promotions without compromising core payment reliability requires decoupling promotional logic from financial checkouts. PayPay accomplishes this via Edge Virtual Waiting Rooms to throttle traffic bursts, single-threaded atomic Redis Lua scripts that prevent budget overruns in sub-millisecond memory, and asynchronous reward crediting reconciled via daily three-way automated audit pipelines. ...