How can I set up an automated invoice‑collection system for my agency, and how should I sell it to clients?

#124 · How I Lost $250,000 in Four Weeks with AI Automation

How can I set up an automated invoice‑collection system for my agency, and how should I sell it to clients?

The automation works by using a Google Sheet as a simple database of invoices you’ve sent. For each invoice you record the date, then calculate how many days have passed. Based on the age you trigger follow‑up emails: after 7 days send follow‑up A, after 14 days send B, and so on (7, 14, 21, 28, 35, 42 days). The sheet can be built in any system you prefer—Google Sheets, a CRM, Stripe, QuickBooks, etc.—as long as you can pull the invoice date and payment status. A second automation watches for incoming payments (e.g., via Stripe) and marks the invoice as paid, so only unpaid invoices continue to receive follow‑ups. The email templates are simple reminder messages that reference the invoice and ask if the client needs anything to expedite payment. This low‑cost setup automates the entire follow‑up process without manual effort.

invoice automationgoogle sheetsstripe

Related answers

youtube ↗Agency Operations

What invoicing software is best for an automation agency that needs recurring invoices and late payment reminders?

I use Stripe for everything. My guiding principle is always ‘keep it simple, stupid’—I want as few platforms as possible, and the automation I build on those platforms should also be simple. Stripe gives me AI-powered features and API endpoints for every need, so I don’t have to resort to hacky workarounds. It handles recurring billing, late‑payment reminders, and integrates smoothly with the rest of my stack, making it the best all‑in‑one solution for my automation agency.

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youtube ↗Agency Operations

Blov 5 asks: how would the invoice collector automation work? If invoices are sent with attachments (sometimes more than one plus HTML), what would your solution be? Also, what's the best place to sell those invoices?

He describes using a Google Sheet to track invoices, checking the date sent to find overdue ones, pulling data into make.com, calculating days overdue, and routing follow‑up emails based on age; for attachments, add a column with the invoice file ID (or link) and use a Google Drive download module so make.com automatically attaches the file when iterating over overdue invoices; you can host invoices anywhere (Google Drive, etc.) and just store the file ID; the same follow‑up logic works for any pipeline, not just invoices; built‑in platform follow‑ups (Stripe, PandaDoc) are poor because they sound robotic, whereas a friendly, assumptive tone preserves relationships and improves response.

invoice automationattachmentsmake.com

youtube ↗Agency Operations

Should I stick with content repurposing or switch to AI automation, what’s the biggest mistake beginners make when selling their first automation, and how do I set up invoice reminders and track overdue invoices?

The invoice reminder is sent from your own business email—the same one you use for regular communication—so customers recognize your domain (e.g., nickleclick.ai) and assume legitimacy. To pull overdue invoices you can use Stripe, QuickBooks, Zero, or any major invoicing tool to retrieve all invoices sent up to a point (e.g., the last 100) and apply the same logic: filter for unpaid, calculate overdue amounts, and send reminders.

invoicingoverdue invoicesemail reminderstripe

youtube ↗Sales

How do you handle recurring retainer payments and invoicing with Stripe, and what tools do you use for proposals and sales workflow?

For recurring retainer payments, I rely on Stripe’s built‑in subscription/invoicing feature: create a customer, attach a recurring product to an invoice, and send it. I don’t need a fancy automated system—manually putting together an invoice takes about 30 seconds and is worth it. For the sales workflow, I use a simple form during calls to capture the customer’s name, email, phone, business, and problem details. That form triggers a make.com workflow that feeds the data into AI, which populates a proposal template on platforms like Panadoc, Better Proposals, or Quiller. Panadoc is handy because it includes payment integration that handles Stripe, though its API cost is high ($2 per document). The overall process is: sales call → form → make.com → AI‑filled proposal → send to client. You don’t need to build a custom widget or workflow; the existing tools are sufficient.

stripe invoicingproposal generatormake.com