# Usage-based billing conventions (telecom)

Consumption (CDR, minutes, franquia usage) imported from SaperX feeds `usage_charges` in the billing engine (see `eden-finance` skill's `billing.md`). Coordinate the exact mapping with `eden-finance` before building the import path — this skill owns the *source* of usage data, not the billing calculation itself.

Legacy pricing fields to preserve on `products` (owned by `eden-commercial`, referenced here for context): `metered`, `minutes_allowance`, `tariff_rates` (`{tipo: {normal, reduced}}` for LC/LDN/VC1/VC2/VC3/LDI), `has_ldi`.