Case Study: PayFlow Solutions — Fintech Payment Platform Scaling

How a B2B payment fintech scaled to 500+ merchants, processing ₹2.5B+ monthly with 99.99% uptime and next-day settlements.

Industry
Fintech & Payments
Services
Payment Gateway · API Platform · Settlement Automation
Timeline
10 Months
Fintech Payment Dashboard

Project Overview

PayFlow Solutions is an India-based fintech startup offering B2B payment collections and disbursement services. Initially processing ₹50M monthly through a basic payment gateway, the company needed to scale infrastructure to support rapid merchant growth while maintaining security, compliance, and 99.99% uptime.

GridMatrix architected and built a high-throughput payment platform with real-time settlement, multi-currency support, advanced fraud detection, and compliance automation — enabling 50x growth in 10 months.

Challenges
  • Legacy payment gateway unable to scale beyond ₹50M monthly
  • Manual settlement processes causing 2-3 day delays
  • High transaction failure rates (1.2%)
  • Absence of real-time fraud detection
  • Compliance gaps (RBI, data residency, encryption)
  • Poor API stability during peak traffic
Strategy
  • Redesign payment engine with horizontal scalability
  • Implement real-time settlement with NEFT/RTGS automation
  • Deploy ML-based fraud detection and risk scoring
  • Build merchant-facing APIs with rate limiting & webhooks
  • Achieve RBI compliance & data residency requirements
  • Set up 99.99% SLA monitoring & incident response

Actions Taken

Payment Platform Architecture
  • Redesigned payment engine using microservices (Node.js + Go)
  • Deployed on Kubernetes for auto-scaling to handle 50,000 TPS
  • Implemented multi-region redundancy with active-active setup
  • Set up real-time monitoring with Prometheus & Grafana
Real-Time Settlement & Reconciliation
  • Automated NEFT/RTGS initiation with bank API integration
  • Built real-time reconciliation engine reducing settlement time from 2-3 days to same-day
  • Implemented double-entry accounting for PnL tracking
  • Created admin dashboard for settlement monitoring
Security, Fraud Detection & Compliance
  • Deployed ML models for real-time fraud detection (99.4% accuracy)
  • Implemented PCI-DSS Level 1 compliance architecture
  • Enabled AES-256 encryption for all data at-rest and in-transit
  • Achieved RBI FACT requirements for payment gateways

Results (10 Months)

50x
Increase in Transaction Volume
99.99%
Platform Uptime
-64%
Transaction Failure Rate Reduction
500+
Active Merchant Integrations

Technical Implementation

The platform is built on microservices architecture running on Kubernetes with auto-scaling. Payment processing is handled by Node.js services with Go workers for high-throughput settlement. All data is encrypted using AES-256 and stored in India-compliant data centers. Real-time fraud detection uses ensemble ML models trained on 2+ years of transaction data. The API layer provides merchant-facing REST endpoints with OAuth 2.0 authentication, rate limiting, and webhook delivery. Settlement automation integrates directly with bank APIs for next-day NEFT/RTGS.

Final Outcome

PayFlow Solutions successfully scaled from ₹50M to ₹2.5B monthly transaction volume with 99.99% uptime. By building a modern, compliant payment platform with real-time settlement and fraud detection, the company attracted 500+ merchants and achieved unicorn-track valuation. The platform now processes 50,000+ transactions per second during peak hours with sub-100ms latency.