Accounts Payable Automation: An Evaluation Guide

Most AP automation evaluations compare feature lists. The lists look alike, so the decision ends up resting on the demo, and the demo runs on the vendor's invoices. This guide is for evaluating on yours. Map the process as it runs today, count where it stops, write requirements from those counts, test every vendor on the same pack, and roll out in stages that each have a test you can fail.

Start with the process you really run

Write the process down with the people who run it. The policy document describes the process someone intended; the clerks can describe the one that runs. Keep it to ten steps or fewer, each with its input, its output and who does it. An honest map of a payables process includes steps the policy never mentions: the invoice forwarded from a buyer's inbox, the spreadsheet where someone tracks what is waiting for approval, the phone call to stores to ask whether the goods arrived.

Then add four numbers for one recent month. Invoices received, split into PO-backed and non-PO. The share that arrived as scans or photos. The number of distinct suppliers. The number of entities or GSTINs you are invoiced against. These decide more about the project than any feature list does. A queue that is mostly non-PO service invoices needs good coding and routing; one that is mostly PO-backed goods needs good matching.

Mark where each piece of evidence lives. Purchase orders in the ERP, goods receipts in a stores register, invoices in a mailbox, approvals in email. Every hop between systems is a place the automation needs an integration, a file or a person, and each hop belongs in the requirements.

Count the exceptions before you choose

For one month, log every invoice that needed a person for any reason other than routine approval, and write the reason down each time. Group the reasons. Do this before you see a single demo, because the groups tell you which kind of tool you need.

In the example, reading the document caused about one exception in ten. The rest came from a price outside tolerance, a missing PO, a goods receipt not yet posted and a vendor missing from the master. A tool that reads invoices beautifully will not shorten that queue on its own. What shortens it is matching with your tolerances, a rule for the non-PO case, a vendor master someone owns, and a workflow that waits for a GRN instead of failing on it. If your count looks like this one, weight the evaluation towards matching and rules. If reading dominates because your suppliers send scans and handwritten amendments, weight it towards extraction and review.

Requirements, stage by stage

Write each requirement as something a vendor can demonstrate on your documents. "Supports three-way matching" is a checkbox. "Matches this invoice to this PO and these two partial GRNs, with our pack-size conversion" is a test. The table is a starting set; replace the third column with examples from your own exception log.

Integration deserves its own line. Ask for the method per system: native, API, file or custom. A vendor who says they integrate with your ERP without naming the method has not scoped it yet, and the method usually decides the timeline. FinSuite Integrations shows what moves in a FinSuite deployment and how. The GST checks in the validation row are covered in detail in the GST automation guide.

Controls an auditor will test

Automation moves the checks earlier in the process. Confirm that it drops none of them on the way. Ask each vendor to show these working, on your data where possible:

• Segregation of duties. The person who corrects a field or codes an invoice cannot approve it, and the approver cannot release the payment. The system enforces the roles.
• Thresholds held as recorded configuration. Confidence thresholds, match tolerances and approval bands each have an owner, and every change records who made it and when.
• Bank detail changes verified out of band. A changed account is held until someone confirms it through a channel other than the email that announced it.
• Duplicates stopped before payment, near duplicates included: a changed prefix, a resent scan, the same invoice through two channels.
• A per-invoice trail that exports. What was read, which rules ran, who decided and what posted, in a form your internal and statutory auditors can use.
• Data handling you can state. Where invoices and bank details are held, who can see them, and a retention period set by your policy.

Review is one of these controls, and the one most often designed badly. The human-in-the-loop guide covers how to set triggers, queues and thresholds so that review keeps working as volume grows.

How to run the evaluation

Give every shortlisted vendor the same pack: fifty to a hundred invoices from last month as they arrived, the matching POs and GRNs, an extract of your vendor master, your approval policy, and the list of exceptions you logged. Keep the answer key: what your team did with each invoice, and why.

Ask each vendor to return, per invoice, what was read, what was matched, what was held and for what reason. Then compare against your key. The most expensive result is an invoice the tool would have posted that your key says should have been held. Next come holds for reasons that are not reasons, because each one costs a person's time. Last, note how long each vendor took to return results on a pack they had never seen. It is a fair preview of onboarding.

Be wary of a demo that only uses the vendor's own invoices, of accuracy claims that do not say what was counted, and of any answer to a what-happens-when question that starts with the system learning over time. The IDP evaluation guide goes deeper on testing the extraction step by itself.

A rollout plan that survives the first month

Start narrow. One entity, or one group of suppliers that covers a large share of volume, with the PO-backed flow first because the match gives the clearest early signal. Add the non-PO flow and the other entities when the exception causes are falling, and let those counts set the date.

The shadow run is the stage teams most want to skip, and the one most worth keeping. A month of your real invoices goes through capture, rules and matching with nothing posted, and the result is compared line by line with what your team did. It surfaces the credit notes the tool mishandles, the supplier who prints the PO number in the remarks line and the approval rule nobody wrote down, while fixing them still costs nothing.

Going live on a single AP workflow typically takes 4 to 12 weeks, an indicative range that varies by document types, workflows, integrations and deployment. Expect the early weeks to go on your documents and your rules as they really are.

What to measure, and the baseline

Take the baseline before the pilot, from the same sources you will read afterwards. Then read the same measures every week of the pilot.

Two cautions. Report by invoice class, because PO invoices, non-PO invoices and credit notes move at different speeds and an average hides the difference. And treat touches per invoice as the headline but exceptions by cause as the diagnosis: a falling touch rate alongside a rising share of one cause tells you exactly where to work next. What these measures should look like once the workflow is running is set out on the Accounts Payable Automation page.

What we would not automate

A disputed invoice. An approval above the band your policy sets. A change of vendor bank details. The accounting treatment of something genuinely unusual. A system should hold each of these with the evidence attached and a named owner, and record that it waited. Automating them would shorten the queue and weaken the control, which is the wrong trade for a payables team.

How to test this on your own invoices

1. Map the process in ten steps with the clerks who run it.
2. Log a month of exceptions by cause, with an owner for each cause.
3. Pull fifty to a hundred invoices as they arrived, with their POs, GRNs and the outcome your team reached.
4. Write the requirements table with your own examples in the third column.
5. Give every vendor the same pack, and score the results against your key.

Whichever vendor you choose, that pack is the evaluation. If you want to run it with us, the finance workflow assessment scores the process first, and the DocPro document test reads one of your invoices now.