- Set the period
- Validate events
- Normalize units
- Reconcile charges
- Allocate once
Three records answer different questions
Usage evidence describes consumption. A contract or rate schedule explains the chargeable unit. An invoice records what a supplier requests for payment. Reconciliation needs all three. An API request, a token, a credit and a completed workflow are not interchangeable units.
Fix identity and timing before multiplying rates
Retain the event identifier, service identifier, source, event time, ingestion time, billing unit and applicable period. Deduplicate only when the identifier and source rules support it. Two similar requests may be legitimate retries and both billable. A late-arriving event may explain a timing difference without making the invoice wrong.
Example: a mismatch that is not a saving
An internal report shows 10,000 units while a supplier invoice shows 10,300. Investigation finds 200 valid units posted after the internal cutoff and 100 units consumed by a shared service excluded from that report. The difference is explained by scope and timing. Reporting a 300-unit “saving” before checking those facts would overstate the result.
Allocate the shared service once
Choose an approved allocation basis appropriate to the service: measured usage, an agreed driver or a documented residual pool. Keep direct charges and shared charges distinct. The sum of allocated amounts plus any unallocated balance should reconcile to the scoped source total. Allocation changes who carries a cost; they do not create a reduction in supplier spend.
Close the exception with retrievable evidence
Record the discrepancy, the evidence reviewed, the accountable decision maker, the disposition and any accounting-period treatment. Escalate unresolved rate or entitlement disputes through the relevant commercial process. Retain the original evidence and the normalized view so another practitioner can reproduce the decision.
Source context
Methods can be adapted internationally. The paid collection’s jurisdiction-specific operating guidance centers on the United States and Canada; apply local requirements and actual contracts. Examples are illustrative, not guaranteed savings or certification.