Reserve credits before an operation runs. Credits are debited when the work is authorized, so two agents sharing 500 credits cannot both reserve 400: the second gets a 402.

Settle a reservation with a track event carrying its reservation_id, and unused credits return to the balance. For high volumes of checks, a lease hands a block of credits to the backend SDK, which decides each check locally. The backend SDKs use leases when DataStream is on and reservations otherwise.

Docs: Credit leases and reservations

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