Business situation
A monthly total cannot explain duplicate events, tiered charges or mid-period package changes.
The key decision
Agree valid usage, event time, rounding and correction rules. Keep usage facts, bills and payments separate.
How implementation works
Deduplicate usage events and generate versioned bill details. Review late events and adjustments before provider payment execution.
Business value and evolution
Customers can inspect fee sources and product teams can test new packages without recalculating historical bills.