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POST
Check Credit Usage
Auth: secret key only.
The response includes advisory: true, exact metric_amount, credits_required, the available balance, and the projected source selection:
Projected deductions follow the same deterministic expiry, priority, creation time, and ID ordering as an authoritative consume, but no source or ledger row is changed. Another request can spend credits before a later track call, so this endpoint is not authorization to perform irreversible work.