Satheesh Kumar Kumara Chinnaian 2026. Event-Driven Billing Infrastructure: Algorithmic Pricing Engines, Stream-Based Metering, and Revenue Analytics for Usage-Based Payment Platforms . International Journal of Computer Information Systems and Industrial Management Applications. 18, 12s (Jul. 2026), 65–75. DOI:https://doi.org/10.70917/ijcisim-2026-3878.