Xendit

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Financial Audit System: NestJS Xendit Payout + @DistributedLock + Cron Ghost Order Auto-Recovery

In-depth analysis of a production-grade financial audit system, covering distributed locks to prevent duplicate payouts, Xendit third-party payout integration, Cron auto-recovery mechanisms, and a complete state machine design.

Backend Development

Avatar Service, Payment Integration, and Public Cache Interceptor

JoyMini API's automatic avatar generation service (Sharp compositing + BullMQ queue), Xendit payment integration (with distributed lock reconciliation), and a Redis-based public cache interceptor implementation.

Interface Management

Full Payment Process Chain — API Xendit → Flutter App → admin-next Financial Audit

NestJS PaymentService (Xendit Invoice/Payout Gateway) → ClientWalletService (Deposit/Withdrawal/Webhook Callback Business Logic) → admin-next Finance Page (WithdrawalList, DepositList, TransactionList)

Management Backend