The problem
Most finance teams run a weekly or fortnightly supplier payment run. The payment proposal is generated from the ERP or accounting system, exported to a spreadsheet, and then someone in accounts payable scans the list looking for anything that looks wrong. Duplicate invoices, recently changed bank details, unusually high values, payments to dormant suppliers, missing PO references and rounded-number amounts all need to be spotted before the file is approved and uploaded to the bank.
In practice this review is manual, inconsistent and heavily reliant on the experience of whoever happens to be checking. Evidence of the review is often nothing more than an email saying “approved”. When something goes wrong — a duplicate payment, a payment to a fraudulent bank account, or a payment to a supplier that should have been on stop — the audit trail is thin and the root cause is almost always a missed manual check.
Why it matters
Payment runs are one of the highest-value, highest-risk processes in finance. A single missed control can result in a duplicate payment worth tens of thousands of pounds, a successful invoice redirection fraud, or a qualified audit finding. Recovering money paid in error is slow, expensive and sometimes impossible.
Beyond the direct financial risk, weak payment run controls create real governance exposure. Auditors increasingly expect to see documented, repeatable evidence that each payment run has been checked against a defined set of rules — not just a tick from a reviewer.
The opportunity
Payment run validation is an ideal candidate for governed, no-code automation. The rules are well understood, the data is structured, and the checks are repeatable. By connecting the payment proposal to supplier master data, recent payment history and bank detail change logs, the workflow can apply every check consistently and produce a clear, auditable exception report before the run is approved.
AI can support the judgement-heavy parts — for example, flagging payments that look unusual compared to a supplier’s normal pattern, or summarising why a particular payment has been flagged — without taking the decision away from the approver.
Example workflow
1. Connect the source data
Pull the proposed payment run from the ERP or accounting system. Connect supplier master data, the bank detail change log, recent payment history, the PO and GRN tables, and any supplier stop or hold lists.
2. Standardise and prepare the data
Normalise supplier names, bank account numbers, sort codes, invoice references and currency amounts. Match each proposed payment to the underlying invoice and supplier record.
3. Apply business logic
Run the validation rules. Typical checks include:
- Duplicate invoice numbers within the run or against the last 12 months of payments
- Bank details changed within the last 30 days
- Payments to suppliers flagged as on stop, dormant or under review
- Round-sum amounts above a defined threshold
- Payments materially above the supplier’s normal value range
- Missing PO or GRN where one is expected
- Suppliers not on the approved supplier list
- Same bank account used by multiple supplier records
4. Run checks and controls
Produce a structured exception list categorised by severity. Apply segregation of duties checks so that the preparer cannot also approve. Log every rule that was run and every record that was tested.
5. Produce outputs
Generate a clear payment run validation pack: the clean payments, the exceptions with reasons, and a summary for the approver. Optionally use AI to draft a short commentary explaining the key items requiring attention.
6. Review exceptions
The AP team reviews and resolves each exception. Decisions and supporting evidence are captured in the workflow, not in email. Approved exceptions release the payment; unresolved items are held back from the run.
7. Move to governed operation
Schedule the workflow to run automatically against every payment proposal. Version control the rules, log every execution, and produce a monthly control report for finance leadership and audit.
What good looks like
- Every payment run is validated against the same documented set of rules
- Exceptions are categorised, evidenced and resolved within the workflow
- Bank detail changes are always flagged and verified independently
- Duplicate payment risk is checked against history, not just the current run
- Segregation of duties is enforced by the system
- A full audit trail is available for every payment run
- Rule changes are version controlled and approved
Benefits
For the finance team
- Faster, more confident payment run sign-off
- Less manual checking and fewer late-night reviews
- Clear evidence to support every decision
For leadership
- Reduced risk of duplicate payments and payment fraud
- Stronger control environment with documented evidence
- Cleaner audit conversations and fewer findings
For the wider business
- Suppliers paid correctly and on time
- Fewer disputes and recovery exercises
- Confidence that controls scale as payment volumes grow
Where to start
Start with the two or three checks that carry the most risk — typically duplicate invoices, recent bank detail changes and payments to suppliers on stop. Build a first version that runs alongside the existing process, so the team can compare results and refine the rules. Once the workflow is trusted, extend the rule set and move it into the live approval path.
How 4th Revolution can help
4th Revolution is finance-led. We combine accounting and controls expertise with data engineering, no-code automation and embedded AI. We do not just build a workflow — we build a governed, repeatable process with documented rules, version control, audit evidence and clear ownership. The goal is a payment run validation process that your auditors trust, your AP team relies on, and your CFO can sign off with confidence.
Example outcome
Before: payment runs were reviewed manually in Excel, with inconsistent checks and an email approval trail. Two duplicate payments and one near-miss on a fraudulent bank detail change had occurred in the previous year.
After: every payment run is validated automatically against a documented rule set. Exceptions are reviewed and evidenced within the workflow, segregation of duties is enforced, and the AP team has a full audit trail for every run. Duplicate payments have been eliminated and bank detail changes are independently verified before payment.