Making Payments Bulletproof: Idempotency, Race Conditions, and Never Charging Twice
Aug 5, 2026A payment looks like one event, it's actually three racing signals fighting to confirm the same money. Here's how we closed the concurrency gaps behind "charged twice" and "paid but no order" bugs in a production checkout flow.
#Payments#Distributed Systems#Backend#Idempotency#Razorpay#Node.js