Designing the invoice validation process and audit trail
Turning ad-hoc discrepancy hunting into a designed process with clear responsibilities and controls.
Achieved results
- Invoice validation checks and an audit trail were implemented, identifying discrepancies and tracking outstanding amounts.Verified outcome. Describes the implemented process, not separate numerical claims.
Business context
This case study focuses on the process I introduced alongside my reconciliation work: invoice validation checks and an audit trail, implemented within a large e-commerce business (anonymised). It is deliberately distinct from the SQL reconciliation analysis.
The problem
Finding discrepancies was only half the problem — without a defined process, flagged invoices could still be paid and outstanding amounts forgotten. The business needed clear checks, owners and follow-up.
My role
I designed how the validation checks would work in practice — who performs them, when, and what happens on failure — and implemented the audit trail that tracked every exception to resolution.
Investigation and approach
- 01Agreed the validation checks with Finance, Vendor Management and Customer Success: contract terms, buy prices, rebates and quantities.
- 02Defined responsibilities: who validates at intake, who reviews exceptions, who approves recoveries.
- 03Designed exception handling: flagged invoices enter a queue with a status and an owner, never silently paid.
- 04Implemented the audit trail recording each check, finding, status and outstanding amount.
- 05Set up follow-up so outstanding amounts were tracked until recovered or written off.
The analysis, for you to explore
Invoice validation & audit trail
Illustrative reconstruction based on implemented work. AS-IS shows the process before the change; TO-BE shows what was introduced.
Click any step in the map to see what happens, who is responsible and where the bottlenecks and exception paths are.
Findings
- Checks at intake prevent most issues from becoming payments — prevention beats recovery.
- Every exception needs an owner and a status, or it silently disappears.
- The audit trail is what makes follow-up possible: outstanding amounts are visible until resolved.
Deliverables
- Invoice validation checks
- Audit trail with statuses and owners
- Exception handling process
- Outstanding-amount follow-up tracking
Tools used
- Process mapping
- Requirements gathering
- Stakeholder discussions
- SQL
- Excel