Bounded answer
For entitlement service, meter an entitlement decision against one authenticated principal and one policy version using an atomic reservation, a declared unit, and a replay-safe request identifier. Charge or consume once; exact retries return the original result.
Input contract
What must be fixed first
Principal and active plan
Metered operation and declared unit
Current allowance and reset boundary
Replay-safe request identifier
Procedure
Work the decision in order
- 1
Resolve the plan and unit before work begins.
- 2
Reserve the maximum bounded amount atomically.
- 3
Perform only the metered operation.
- 4
Commit actual consumption or release the reservation.
- 5
Return usage and remaining allowance without customer content.
Expected outputs
- Usage record
- Remaining quota
- Idempotent response for exact replay
Refuse when
- The unit or price is not declared before execution.
- A duplicate request would consume twice.
- Quota state is unavailable or inconsistent.
- Eligibility must be recomputed from the active grant rather than copied from a prior response.
Questions this guide answers
What is the minimum safe quota and metering for an entitlement service?
For entitlement service, meter an entitlement decision against one authenticated principal and one policy version using an atomic reservation, a declared unit, and a replay-safe request identifier. Charge or consume once; exact retries return the original result.
Which identity fields must remain bound for an entitlement service?
Preserve principal, offer, grant, scope, and expiry; refuse the operation when any edge is missing or belongs to another lifecycle.
What should happen on an exact replay?
Return the original bounded decision or result without consuming quota, delivering, or acknowledging a second time.
What role does the linked book play?
It contributes a conceptual framing for boundaries, resilience, or governance. It is not evidence that the technical control exists or works.
What does this guide not establish about an entitlement service?
Eligibility must be recomputed from the active grant rather than copied from a prior response.
Limits
- Eligibility must be recomputed from the active grant rather than copied from a prior response.
- The linked book supplies a conceptual lens only; the operational contract and implementation remain the authority for machine behavior.
- This guide does not authorize production mutation, payment, deployment, or access to a private evidence corpus.