Monitor EV charging sessions and bill via a CPMS

Steps

1. Connect your charge points to the CPMS over OCPP (1.6J or 2.0.1); the CPMS receives StartTransaction, MeterValues, and StopTransaction messages from each charger to build a live session record.
2. Via the CPMS REST API, subscribe to session webhooks or poll GET /sessions to retrieve active and completed session records including charger ID, connector, start time, energy delivered (kWh), and current state.
3. Configure tariff rules in the CPMS for your pricing model (per kWh, per minute, session fee, or a combination); the CPMS applies the tariff to the session's accumulated meter values to produce a billable amount.
4. On session end, retrieve the completed CDR (Charge Detail Record) via GET /sessions/{sessionId}/cdr; the CDR contains signed meter start/stop values, duration, energy consumed, applied tariff, and the calculated cost.
5. Integrate payment processing by sending the CDR cost to your payment gateway or invoicing system; map the CPMS user ID or RFID token to your billing account.
6. For monitoring, poll GET /chargers and GET /sessions/active periodically or consume real-time webhooks to detect offline chargers, failed sessions, or abnormal meter readings that indicate hardware faults.