Start by identifying what each system counts
Check date ranges, time zones, currencies, tax and shipping treatment, refunds, duplicate events, lifecycle rules, and whether the system is reporting a conversion, a booked amount, or collected revenue.
Reconnect the missing journey
Bring source, campaign, session, identity, CRM or commerce record, and revenue event into a common model. Reconciliation should reveal why numbers differ—not hide the difference behind a blended total.
Use one decision-ready view
Keep source-system reports for operational work, but make allocation decisions from a reconciled revenue view that shows both the outcome and the touchpoints that influenced it.