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- SaleOrder._fc_rate_usage: aggregates usage, computes overage via charge._compute_billable, upserts sale.order.line for the overage product - FusionBillingUsage._cron_rate_open_periods: hourly cron iterates active charges × in-progress subscriptions, calls _fc_rate_usage - data/ir_cron.xml: two crons — rate usage (hourly), dispatch webhooks (2 min) - __manifest__.py: registers data/ir_cron.xml in data list - test_usage.py: test_rate_open_period_creates_overage_line (TDD, FCB_EXIT=0) Reference: _create_recurring_invoice / _get_invoiceable_lines confirmed in Enterprise sale_subscription/models/sale_order.py — overage line goes onto sale.order so native invoicing picks it up via _get_invoiceable_lines.