Accounts-Receivable & Collections AI Agent

What this agent does

Matches the cash, not the credit decision

Remittances arrive from bank feeds, lockbox files, payment portals and connected AR systems.

Invoice references and payment identifiers are normalised before matching runs.

Reason

Open invoices are matched against each remittance line by amount, date and reference.

Configured cash-application rules and customer-specific matching logic are applied.

Prior remittances and the customer's payment history inform an ambiguous match.

Decide

Unapplied and short payments are flagged, each with a proposed explanation.

Full-satisfaction language and disputed deductions are routed to the named credit officer, never auto-applied.

Out

The remittance, the proposed match, the flags and every override are retained against the account.

Execute write actions only inside the approval boundaries agreed during implementation.

→ Product statement

The agent proposes the match and the contact; the credit officer decides settlements, write-offs and credit limits, and the company remains the creditor of record.

Example workflow

One remittance, cash to contact

AgentHuman

1Remittance receivedBank feed, lockbox file, payment portal or AR system API

2Context assembledOpen invoices, customer history, contact rules and prior remittances

3Match proposedProposed match, explanation, flags and confidence

4Controls appliedFull-satisfaction check, deduction check, per-state contact rules and confidence threshold

No human action required

Stages 1 to 4 run unaided, and nothing posts or contacts anyone at any of them — the credit officer's lane opens at the confidence gate.

5DecisionBranches at the confidence threshold

High confidence

Goes to the credit officer to approve.

Low confidence

Adds a senior-credit read first.

Credit approval

The match is held with its evidence, its flags and the confidence.

Approve · Adjust · Send to credit manager

Approved — released to post▼

6Receivables system updatedOnly where write access and approval policy allow it

7Outcome evaluatedMatch accuracy, override rate, dispute outcomes and days to resolve

Overrides

Every credit-officer override is counted in the evaluation.

What should not run autonomously

Human approval stays in control

Outside the boundary — human approval required8 items

Applying or depositing a check marked paid in full.

Settling an account or agreeing a payoff.

Writing off a balance.

Releasing a lien, claim or guarantee.

Automation boundaryAgent acts unaided

✓Match incoming remittances to open invoices by amount and reference.

✓Propose an explanation for every unapplied or short.

✓Run approved dunning contact within configured.

✓Route disputes and deductions to the named credit officer for the named owner.

Any write happens inside the boundaries agreed at implementation, never ahead of approval.

Threatening legal or other collection action.

Deciding a credit limit, or the reasons behind it.

Reporting a balance to a credit bureau.

Ruling a deduction valid, invalid or fraudulent.

Example output

One remittance, annotated

Everything the agent proposes is attached to the account it came from.

Cash-application output · single remittanceIllustrative example

Customer

Remittance line

Amount

Proposed match

Confidence

Reason code

Regional distributor account

Wire remittance covering three invoices, one short

$18,240.00

Matched to INV-3381, 3382, 3384

88%

Pricing-discrepancy deduction, unconfirmed

As receivedTaken from the remittance and the invoice ledger — nothing on this side is inferred.

Evidence used Remittance advice text Prior payment pattern Open invoice balances

Why this matchThe shortfall carries a deduction code the agent can't confirm.

ActionApproveAdjustSend to credit manager

What the score decidesBelow the configured threshold the match routes to a senior-credit read before the credit.

Value

Where AI adds value

The same four claims, placed at the point in the workflow where each one applies.

Where the value landsValue 01 – 04

Every remittanceFrom the bank or lockbox feed

03Matching

Match against open invoices

Apply configured cash-application rules and the customer's payment history.

01Approved path

Chasing is not collecting

Routine remittances are matched and posted without a person touching them.

02Human review

Send review to the shortfalls

Short pays, deductions and full-satisfaction language are flagged, so the credit officer's read starts where risk concentrates.

04Build an evidence trail

The balance, the evidence behind it and the credit officer who approved the step stay on the account.

Integrations

Typical integrations

Five system groups connect to the same agent. Which of them are in scope is decided in discovery.

AR and invoicing systemsNetSuite · SAP · Oracle
Dynamics · Sage Intacct

Banking and remittance dataBank feeds · lockbox files
Payment portals · EDI remittance

Customer recordsCredit files · contact info
Contract and dunning history

Agent

Cash application & collections

Reads the ledger
Proposes the match
Holds for approval

WorkflowEmail · ticketing
Approval systems

Observability & evaluationOpenTelemetry · Langfuse
Supported monitoring/evaluation sources

Integration availability depends on the client's existing systems and API access.

Agent controls

Six layers between the model and the cash

Each control encloses the next. What the stack lets through is named in the map under it.

L6 · Outermost — last line of defenceInward → L1 · closest to the model

L6Rollback / safe modePull the agent back to proposal-only when evaluation or production signals degrade.Roll back

L5Version monitoringTrack model, prompt, matching-rule and contact-policy changes.Track

L4TraceabilityRecord the remittance, the proposed match, the flags and every override.Record

L3Credit approvalHold matches for the named credit officer; it governs release, not whether the match is right.Gate

L2Policy guardrailsTest proposals against full-satisfaction, deduction and contact rules; a failure holds the item.Restrict

L1Confidence thresholdsRoute low-confidence matches to a senior-credit read before the credit officer sees them.Require review

Model coreMatch proposed — the match, explanation, flags and confidence

L1 – L2Test whether a match may stand

L3Puts the release in a credit officer's hands

L4 – L5Keep the balance and the evidence behind it

L6Drops the agent to statement-only contact when signals degrade

How Nestack evaluates it

Evaluate the cash-application workflow — not only the final match.

Coverage runs the whole depth of the workflow, and every layer is cut by slice.

Surface — the match the customer sees

Depth of coverage ▼

E1Final-output evaluationDid the proposed match tie to the correct open invoices?

E2Step-level evaluationDid the agent use the right ledger, contact rules and consent record?

E3Tool evaluationDid it read and write the correct account and invoice?

E4Confidence calibrationDo low-confidence matches actually attract more overrides?

E5Slice evaluationHow does performance change across specific customer cohorts?

E6Business outcomeHow many matches needed an override or a later correction?

Floor — the outcome the credit team answers for

Failure modes

Where each failure originates in the agent

Seven failure modes plotted against the five stages of the agent lifecycle.

Agent lifecycleDirection of processing →

01 · Retrieval1 mode

DU-03

Superseded aging snapshot

Invoice or customer history is read from a stale aging run.

Stage gathersRemittance advice, invoice ledger and payer history

02 · Reasoning2 modes

DU-04

Full-satisfaction blindness

A short-pay check carrying full-satisfaction language is read as an ordinary partial.

DU-06

Deduction mischaracterized

A trade deduction is read as nonpayment and queued for dunning.

Stage proposesThe proposed match, explanation and confidence

03 · Tool / write2 modes

DU-02

Low-confidence auto-apply

Agent applies a match despite insufficient certainty.

DU-05

Duplicate remittance posted

Same remittance is applied to two invoices.

Stage writesOnly where write access and approval policy allow it

04 · Output1 mode

DU-01

Misapplied remittance

Payment applied to the wrong open invoice.

Stage returnsThe application the credit officer approves

05 · Change / Version1 mode

DU-07

Silent contact-rule drift

A model or rule change widens who the agent contacts, or how.

Stage tracksModel, prompt, matching and contact rules

Sev-1 · a held action executes without Sev-2 · a wrong match reaches the ledger Sev-3 · source degrades, match routes to review

See the complete Accounting failure-mode catalogue →

Affected slices

A healthy rate can hide one bad cohort

A healthy overall match rate can hide a handful of cohorts where unapplied cash concentrates. Nestack reports the unapplied-rate lift by slice, not only in total Nestack reports it by slice rather than in aggregate..

Slice performance — reported separately, not only in aggregateIllustrative example

Slice	Failure rate	Lift	Status
Short-paid with a deduction code	6.7%	3.5×	Review
Remittance sent separately	4.4%	2.3×	Review
Consolidated multi-invoice payments	3.2%	1.7×	Watch
Single invoice, exact match	1.9%	0.8×	Normal

Bar: unapplied-rate lift vs. the exact-match baseline · scale 0–4.0× · tick marks the 2.0× review threshold 2 of 4 slices over threshold

Evidence-linked improvement

The loop closes on a regression case

A cycle closes when the misapplied payment is a case the next release has to survive. That suite is what the next remittance posted is measured against.

Improvement cycle · five stagesSwitchback — the path turns at Improve and returns at Learn

01Detect

Unapplied-rate rises in a remittance cohort.

02Diagnose

The remittance that matched the wrong invoice is traced back through the rule and the record that produced it.

03Improve

The fix ships against a version, with the accounts that exposed it attached.

04Verify

Release is held until the affected cash-application cases pass again.

05Learn

The case joins the permanent suite and the contact rules move with it.

Learn → DetectThe return edge. Detection next time runs against a suite one case longer.

Typical build scope

Twelve workstreams across six weeks

The build scope read against the delivery timeline. Week structure follows the six-week plan — discovery, sources, matching workflow, evaluation, integration, then production validation and handover.

Workstream Week 1Week 2Week 3Week 4Week 5Week 6

01AR workflow discovery and boundary setup and boundary definition.

02Bank, lockbox and AR-system assessment.

03Contact-rule and state mini-FDCPA mapping and rule mapping.

04Remittance ingestion and normalisation.

05Matching logic and explanation drafting.

06Confidence scoring and dispute routing.

07Credit-officer approval workflow.

08Receivables-system integration.

09Cash-application regression cases.

10Guardrails and contact controls.

11Account-trail instrumentation.

12Deployment, documentation and Agent Care handover.

12 workstreams · 6 weeks · bar shows the weeks a workstream is active — several run in parallel Final scope and sequence confirmed in discovery

Engagement tiers

What each tier includes

Rows are the capabilities named in each tier's scope. Higher tiers include everything below them.

Capability✓ in scope · — not at this tier PilotOne AR system, one entity ProductionProduction receivables systems AdvancedMultiple entities / systems

Introduced at Pilot

Matching and dunning recommendations✓✓✓

Credit approval✓✓✓

Match-accuracy baseline✓✓✓

Introduced at Production

Reporting by ageing band—✓✓

Approval workflow in your systems—✓✓

Approved cash posting—✓✓

Receivables-system integration—✓✓

Introduced at Advanced

Multi-state contact rules——✓

Multi-stage credit approvals——✓

High remittance volume——✓

Multi-entity receivables controls——✓

Build price From $5,000 From $8,000 Custom quote

Final build priceConfirmed after discovery based on integrations, workflow complexity, transaction volume, approval controls and deployment requirements.

Separate from buildBuild pricing is separate from recurring Agent Care, which covers managed monitoring, evaluations, incidents and verified improvements after launch.

What we need from you

What you bring, and what we build with it

Each input maps to a piece of build scope and a week in the delivery timeline.

You bringWe build with it

01Your invoice and remittance data → Remittance ingestion and matching setupWeek 1

02Representative historical remittances → Matching baseline, explanation drafting and confidence scoringWeek 2

03Your approved contact rules and dunning cadence → Contact-rule and automation-boundary mappingWeek 1

04Access to relevant APIs, feeds or exports → Bank, lockbox and AR-system assessment, then integration setupWeek 2

05Payments you would not want applied → Short-pay cases and failure-mode testingWeek 4

06What no contact may say on its own → Confidence scoring, flag routing, guardrails and contact controlsWeek 3

07Named credit officers to review matches → Credit-officer approval workflow, then pilot and production validationWeeks 5–6

Nothing else is required Deployment, documentation and Agent Care handover are ours.

Delivery timeline

Four phases across six weeks

Each band covers the weeks the work really takes, which is why week 5 carries evaluation and pilot together.

Phase W1W2W3W4W5W6

Discovery W1

Build W2 – W3

Evaluate W4 – W5

Pilot & Launch W5 – W6

Week focus W1AR workflow discovery, contact-rule mapping and the boundary W2Source integration and the matching baseline W3Matching workflow, confidence logic and approval controls W4Evaluation suite, guardrails and failure-mode testing W5Bank integration, pilot remittances and targeted corrections W6One ageing cycle run under the credit manager, then Agent Care handover

Reading the bandA bar covers the weeks its work is named in, and nothing else. The week 5 overlap is real, not padding.

At the end of W6Validation closes on live accounts, and Agent Care picks up monitoring.

DurationSix-week plan shown · typical delivery 4–6 weeks depending on scope confirmed in discovery.

Next step · Accounting AI agent

Build an AR and collections agent around your credit team's approval chain.

Show us your remittance sources, your contact rules and who signs off on exceptions. If short pays and deductions are still triaged by hand, we'll map the match logic, set the contact boundary and name who owns every dispute.

Discuss this agent →

Nestack Agents · Cash application & collectionsAGT-ACC-14 · Agent Care available after launch

Accounts-Receivable & Collections AI Agent (Cash Application & Dunning)