# Meter Event Aggregation Window Check

Check reported usage against the meter events summed in the aggregation window.

## Scope
Preparation and review only. No account action or professional decision.

## Inputs
The usage events in the window and the reported usage total.

## Workflow
1. List the meter events in the aggregation window.
2. Sum the event values.
3. Compare the sum to the reported usage.
4. Return the check without billing changes.

## Output contract
meter | window | events | summed_units | reported_units | difference

## Fictional acceptance test
Fictional meter’s period shows events of 120, 85 and 40 units, a sum of 245 against a reported usage of 240: 5 units of difference to trace to a late-arriving event outside the window.

## Review gates
Keep original values, source IDs and version dates. Unknown facts stay held. Use qualified review for hiring, legal and accounting conclusions. No send, share, sign-in, scheduling, ledger change or payment. Fictional contract review is not a live account compatibility test.

## Method source
https://docs.stripe.com/api/billing/meter-event

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