SmartPay Orchestrator Backend

A comprehensive payment orchestration platform with AI-powered fraud detection, smart routing, blockchain rewards, and conversational analytics.

🏗️ Architecture

• API Layer: AWS API Gateway + Lambda Functions (LocalStack)
• Authentication: AWS Cognito with JWT tokens (LocalStack)
• ML Models: AWS SageMaker endpoints for fraud detection and routing optimization (LocalStack)
• Search & Chat: OpenSearch + RAG pipeline with OpenAI/Bedrock (LocalStack)
• Event-Driven: EventBridge for decoupled workflows
• Infrastructure: Terraform + AWS SAM for IaC (LocalStack)

🚀 Features

Core Services

• Fraud Detection: XGBoost + Graph Neural Networks for real-time risk assessment
• Payment Routing: Contextual bandits for optimal gateway selection (Stripe, AmazonPay, Solana)
• AI Assistant: RAG-powered chat for payment analytics

API Endpoints

• POST /fraud - Real-time fraud analysis
• POST /route - Smart payment routing
• POST /pay - Payment processing orchestration
• POST /chat - AI-powered analytics chat

🛠️ Setup & Development

Prerequisites

• Node.js 18+
• AWS CLI configured or LocalStack
• AWS SAM CLI or LocalStack
• Docker (for local testing)

Environment Variables

AWS_REGION=us-east-1
FRAUD_ENDPOINT_NAME=fraud-detection-endpoint
ROUTING_ENDPOINT_NAME=routing-bandit-endpoint

STRIPE_SECRET_KEY=sk_test_...
OPENAI_API_KEY=sk-...
OPENSEARCH_ENDPOINT=https://search-...

Local Development

npm install

npm test

npm run build

sam local start-api --port 3001

sam build && sam deploy --guided

(if localstack please use docker run)

🚢 Deployment

🤖 ML Models

Fraud Detection

• XGBoost: Gradient boosting for transaction features

Payment Routing

• Contextual Bandits: Multi-armed bandit optimization
• Features: Amount, risk, merchant type, region

Scaling

• Auto-scaling Lambda functions (LocalStack)
• DynamoDB on-demand billing (LocalStack)
• ElastiCache for hot data
• CDN for static assets

🐛 Troubleshooting

Common Issues and Future Builds

1. SageMaker Timeout: Check endpoint status and scaling
2. Cognito Auth: Verify JWT token expiration
3. Solana RPC: Network congestion or endpoint limits
4. OpenSearch: Index refresh intervals
5. Reward System: Propoased Reward system involves recommendation systems and crypto exchanges