usage aggregation
How metered usage is rolled up over a billing period to compute the charge — sum of all usage, count of events, last value during the period, last value ever, or the period maximum. A qualifier of `recurring_price` (cardinality one), present only when `usage_type` is metered. A governed token (Stripe Billing Meter default_aggregation), growing (L13).
Usage aggregation is answered with one word chosen from the usage aggregations list — the same word shared across every product that uses it.
It is a qualifier of recurring price — it has meaning only inside a recurring price statement, one per statement, never on its own. It belongs with recurring price to subscription & financing — one facet of a product.
It is answered inside every recurring price statement, not as a standalone question on a kind.
Answered inside every recurring price statement — not a standalone slot on any kind.