From a For-Loop to a Fault-Tolerant Payout System (₹70L/month, 0 Duplicate Payments)

How we moved from a fragile loop-based payout system to a reliable, idempotent, and traceable architecture. Paying Money Is Easy. Paying It Correctly Is Not. On paper, payouts sound simple: Customer places an order Platform collects payment Platform pays the seller That's it. Until you try to do it at scale . The Real Problem Behind "Simple" Payouts In any marketplace or fintech system, money flows across multiple parties: Sellers / vendors Delivery partners Platform fees Discounts, vouchers, wa