PayZen FinTech & Merchant Gateway
Architected a mission-critical multi-currency payment checkout gateway and merchant portal supporting automated bKash, Nagad, Rocket, and Card transactions with JWT API security, sub-80ms webhook dispatch, and automated financial reconciliations.
The Core Challenge
The client struggled with fragmented payment gateways, high drop-off rates during mobile checkouts, manual ledger balancing, and slow webhook latency (often exceeding 3.5s) causing payment status desynchronization.
The Architectural Solution
Engineered a unified API aggregator with asynchronous Redis queue-driven webhook notifications, multi-layered fraud detection, automated bank ledger reconciliation, and an ultra-fast one-click checkout modal with sub-80ms transaction confirmation.
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