Billing Report
Monthly billing report for this API client.
The authoritative usage view is quota_seconds: the seconds bucket. Fields:
quota_seconds, consumed_seconds, remaining_seconds, percent_consumed
(0-100, the figure to show the client), over_quota (true when the account
is at or below the start floor; new generations and preset creation are
blocked), unlimited (true when the account has no quota cap at all —
distinct from a quota of 0, which means the account is fully blocked pending
subscription and reads percent_consumed: 100, over_quota: True).
Use percent_consumed / remaining_seconds to show how much the client has left.
Also returns the course summary and the per-external_ref breakdown_by_ref.
Example: GET /api/v1/billing?month=2026-04