Finance & FP&A

How to automate ap invoice approvals as Professional Services Founders

Finance & FP&AFor Professional Services Founders2 apps12 steps~24 min to set up

At a 12-person consultancy, accounts payable is nobody's job title but everyone's headache. A senior ops person manually routes vendor invoices — subcontractors, software subscriptions, coworking fees, freelance designers — through Slack DMs and email threads to get approval, then logs them in QuickBooks or a shared Google Sheet. The same $4,200 subcontractor invoice sits unanswered for nine days because the approver was on a client site. Month-end close turns into an archaeology dig. You've missed early-pay discounts, paid late fees, and once approved a duplicate invoice from a vendor who resubmitted after a 'did you get this?' follow-up. Nothing about this scales past 15 people.

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Finance & FP&AFor Professional Services Founders2 apps12 steps~24 min to set up

Outcome

What you'll set up

An automated AP approval workflow that routes new invoices by vendor type and amount, pings the right approver in Slack, and logs approvals back to QuickBooks — without you touching it

A live spend dashboard (built on Transaction Insights) showing month-over-month AP by vendor category, flagging any invoice that's out of the normal range before it gets paid

A task queue that tracks every invoice awaiting approval, its due date, and who's sitting on it — so nothing ages past your net-30 window

The Starch recipe

Apps, data, and prompts

The combination of Starch apps, the data sources they pull from, and the prompts you use to drive them.

Apps used

Transaction Insights Task Manager

Data sources & config

Starch syncs your QuickBooks data on a schedule (invoices, bills, vendors, payments) and syncs your Gmail on a schedule so the agent can read incoming invoice emails. Plaid bank account data is also synced on a schedule to power the spend dashboard. Slack is connected from Starch's integration catalog — the agent queries it live to send approval notifications and weekly summaries. The Task Manager surface tracks open approval tasks with due dates and assignees.

Prompts to copy

Every time a new invoice arrives in my Gmail labeled 'AP-Inbox', extract the vendor name, amount, and due date, then create an approval task assigned to the right approver based on this rule: invoices under $1,000 go to our ops lead, $1,000–$5,000 go to me, over $5,000 require both of us. Send the approver a Slack message with the invoice details and a link to approve or flag.

Build me a spend dashboard that pulls from our Plaid-connected bank accounts and shows total AP paid this month by vendor category — subcontractors, software, office/coworking, travel — with a month-over-month comparison and a flag any time a vendor charge is more than 20% above their historical average.

Every Friday at 4pm, send me a Slack summary of all open AP tasks that are due in the next 7 days, sorted by due date, with the assigned approver and current status.

Run these in Starch → or paste them into your favorite agent

Walkthrough

Step-by-step

1 Connect Gmail to Starch (scheduled sync). Set up a Gmail label called 'AP-Inbox' and train your team — or your subcontractors — to send invoices to your billing address so they land there automatically.

2 Connect QuickBooks to Starch (scheduled sync). Starch syncs your bills, vendors, payments, and journal entries on a schedule so the agent knows your existing vendor history and payment patterns.

3 Connect Plaid (scheduled sync) to your primary operating account. This powers the spend dashboard and lets you cross-reference what's been approved vs. what's actually cleared the bank.

4 Connect Slack from Starch's integration catalog. The agent queries it live to send approval request messages and weekly digest summaries to the right people.

5 Type your first automation prompt into Starch: describe the routing rules by dollar threshold and vendor type. Starch builds the automation — no flowchart builder, no drag-and-drop.

6 Install the Transaction Insights starter app from the Starch App Store. Fork it to add a vendor-category breakdown specific to your consultancy: subcontractors, software tools, coworking/office, travel, and professional development.

7 Set up the Task Manager app to capture every invoice that enters the approval queue. Each task gets the vendor name, invoice amount, due date, and assigned approver pulled from the Gmail extraction step.

8 Add an overdue rule: any AP task that hasn't been approved within 48 hours of creation triggers a follow-up Slack ping to the approver and a separate alert to you.

9 Configure the Friday digest automation. Each week, Starch pulls all open AP tasks from the task manager, formats them by urgency, and Slacks you the list — so Monday morning isn't a surprise.

10 Set a spend anomaly alert in Transaction Insights: any vendor whose charge is more than 20% above their 90-day average triggers an immediate Slack notification before the payment goes out.

11 At month-end, prompt Starch to generate a reconciliation summary: invoices received vs. approved vs. paid vs. logged in QuickBooks, with any gaps flagged. This replaces the manual spreadsheet audit your ops lead currently runs.

12 Optionally, tell Starch to automate submission of approved invoices to your accounting workflow — Starch can reach any vendor portal or payment platform through your browser with no API required.

See this running on Starch

Connect your tools, describe what you want, and the agent builds it. Closed beta is free.

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Worked example

March 2026 AP Close — 12-person Strategy Consultancy

Sample numbers from a real run

Subcontractor — UX researcher (3 invoices)	11,400
Subcontractor — copywriter (2 invoices)	4,800
Software subscriptions (Notion, Figma, Loom, Linear)	1,240
Coworking / WeWork day passes	980
Travel — client site visits	2,300
Freelance designer — one-off project	3,500

In March, 11 invoices hit the AP-Inbox Gmail label across four vendor categories. The UX researcher sent three separate invoices totaling $11,400 — under the old Slack-and-spreadsheet system, all three sat in the ops lead's inbox for an average of 6 days before being approved, and one nearly missed the researcher's net-15 payment term. Under the Starch workflow, each invoice was extracted on arrival, a Task Manager entry was created automatically, and the ops lead got a Slack message with the invoice attached. Approval time averaged under 4 hours. The copywriter's second invoice came in 22% above her usual rate ($2,800 vs. a $2,300 average) — Transaction Insights flagged it automatically before payment. It turned out to be a legitimate rush-fee adjustment, but the founder confirmed it before it cleared rather than noticing it at close. The freelance designer invoice at $3,500 crossed the $1,000 threshold, so it routed to the founder directly — approved in 90 minutes via Slack. Total March AP: $24,220 across 11 invoices. Zero late payments. Zero duplicates. The Friday digest on March 28th showed two invoices still open; both were approved same day. Month-end reconciliation took 12 minutes instead of the usual 2-hour spreadsheet session.

Measurement

How you'll know it's working

Average invoice approval cycle time (target: under 48 hours from receipt)

AP invoices overdue past net-30 terms (target: zero)

Vendor charge anomalies caught before payment vs. discovered at month-end

Month-end AP reconciliation time (hours spent manually vs. with Starch)

Duplicate invoice detections per quarter

Comparison

What this replaces

The other ways teams handle this today, and how the Starch version compares.

Bill.com

Purpose-built AP automation with strong controls, but adds another subscription, requires vendors to register on their platform, and doesn't connect to your existing Gmail/Slack/QuickBooks stack the way Starch does — you're managing two workflows instead of one.

QuickBooks + manual email routing

You already pay for QuickBooks and it handles the ledger, but the approval routing still lives in Slack DMs and someone's memory — Starch automates that gap without replacing QuickBooks.

Notion + Zapier approval board

Flexible and cheap to start, but you're the one building and maintaining the Zapier flows every time a rule changes; Starch rebuilds the automation from a plain-English description when your rules change.

Kantata / Projector PSA

Includes AP workflows as part of a full PSA suite, but implementation takes a quarter, pricing is built for 200-person firms, and you'd be ripping out HubSpot and Harvest to fit their model — not worth it at 12 people.

On Starch RECOMMENDED

One platform — transaction insights, task manager all running on connected data. Setup in plain English; numbers stay current via scheduled syncs and live agent queries.

Try it on Starch →

FAQ

Frequently asked questions

We use QuickBooks but our bookkeeper enters everything manually. Does Starch replace that?

No — Starch reads your QuickBooks data (bills, vendors, payments, journal entries sync on a schedule) and automates the routing and approval workflow upstream of QuickBooks. Your bookkeeper still owns the ledger. What changes is that approved invoices arrive at their desk faster and already reconciled against what hit the bank.

Our subcontractors send invoices in all different formats — PDFs, Word docs, even photos. Can Starch handle that?

Yes. Starch reads the Gmail thread, including attachments, and extracts vendor name, amount, and due date regardless of format. If an invoice is ambiguous, the agent flags it for human review rather than guessing. It won't silently miscategorize a $4,000 invoice.

Is Starch SOC 2 certified? We occasionally have clients ask about our vendor security posture.

Not yet — Starch is not currently SOC 2 Type II certified. If your client contracts require SOC 2 Type II on every tool in your stack, that's worth knowing upfront. For most 12-person consultancies running AP through Gmail and QuickBooks today, this is a lower-stakes question than it sounds.

What if a vendor portal requires us to log in and submit payment confirmation? There's no API.

Starch automates that through your browser — no API needed. If you can log in and click through the portal as a human, Starch can do it. This covers the majority of subcontractor and vendor portals that don't have formal integrations.

We're moving from QuickBooks to Xero next quarter. Does that break everything?

No. Xero is available from Starch's integration catalog — the agent queries it live when your apps run. You'd reconnect your accounting source and tell Starch the change; the AP workflow and spend dashboard keep working. The approval routing and Gmail extraction don't care which accounting tool is downstream.

How is this different from just setting up a Gmail filter and a shared Notion doc?

The Gmail filter gets invoices into a folder. The Notion doc tells you they exist. Neither one routes to the right approver, pings Slack, tracks whether the approver acted, cross-references the amount against the vendor's history, or reconciles approved invoices against what cleared the bank. Starch does all of that from one plain-English description of the workflow.