System Requirements
- Evaluate transactions against thousands of fraud rules in < 50ms
- Global velocity counters (e.g., cards per IP in 10 mins)
- Asynchronous risk graph construction without blocking payment flow
- Zero-downtime rule updates and dynamic merchant risk thresholds
Graded Constraints
01Budget: $30,000/month
02API Gateway with strict TLS termination and mutual auth
03Dual path architecture: Synchronous decision path + Asynchronous feature pipeline
04In-memory ultra-fast cache for velocity checks
05Audit-proof immutable logging database
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