Your agent can do more than one-off jobs — it can wire up workflows that run on their own. Invoice Ninja already has the moving parts: recurring invoices, scheduled reminders, the task timer, payment gateways, and a full REST API. Here are ten multi-step workflows worth handing over.

1. Recurring invoices with auto-bill

Retainers and subscriptions are the classic case. The agent sets up a recurring invoice on the right frequency, enables auto-bill so the client’s saved card is charged through your gateway, and turns on failure notifications so a declined card never goes unnoticed. It can also verify the scheduler that fires recurring invoices is actually running on your server. Try: “Set up a 500 dollar monthly retainer for Acme starting on the 1st, auto-bill their saved card, and email me if a charge fails.”

It can set the recurrence to stop after a fixed number of cycles, which is how you bill a package monthly. And it will check the client actually has a payment method saved in the portal before auto-bill is switched on — otherwise the first run fails noisily.

2. Quote-to-cash pipeline

A quote should not sit in a list until someone remembers it. The agent can build a weekly routine: quotes sent more than a few days ago with no response get a polite nudge with the quote link, approved ones convert to deposit invoices, and the rest get reported to you. Try: “Every Monday, list quotes sent over 5 days ago with no response, nudge the contact with the quote link, and convert any marked approved into a 30 percent deposit invoice.”

3. Overdue escalation chain

Chasing late payers works when it is systematic. Invoice Ninja has three scheduled reminders plus late-fee amounts in the settings; the agent can set the reminder days, attach the fees to the right reminder, and add a final step it runs itself — a Friday list of everyone at the last stage, with contact details. Try: “Turn on reminders at 3, 7, and 14 days past due, add a 25 dollar late fee at the second reminder, and every Friday send me the invoices at stage 3 with the client’s phone number.”

Because the reminders are scheduled actions inside the app, the chain stops the moment an invoice is paid — nobody gets a late notice for a settled bill. That is the difference between an automation and a mail merge.

4. Expense-to-rebill

If you resell costs — hosting, ad spend, materials — those expenses should become client billables, not margin leaks. The agent can flag recurring vendor expenses as billable, apply your markup rule, and once a month draft an invoice that pulls every unbilled expense for that client onto one document. Try: “Any expense over 50 dollars for client Northwind is billable — put them on that client’s next invoice with a 15 percent handling markup, and draft it for my approval on the last day of each month.”

5. Time tracking straight to invoice

Invoice Ninja tasks have timers, and logged time can be invoiced at a rate. The agent can run a weekly sweep: total the unbilled time on a project’s tasks, draft an invoice from those tasks at the agreed rate, and leave it in drafts for your review — no manual math. Try: “Every Friday, total the unbilled time on the Meridian project tasks, draft an invoice from those tasks at 95 per hour, and leave it in drafts for me.”

6. New-client onboarding sequence

Onboarding has five boring steps: create the client, add the contacts, set terms and currency, enable the client portal, and send a welcome email with the portal link. The agent can chain them so a new client is ready to be billed in one request. Try: “New client: Wildseed Studio, billing contact ap@wildseed.co — set them up with Net 30 terms, enable the client portal, and send a welcome email with their portal link.”

7. Monthly accountant pack

Instead of scrambling at tax time, have the agent assemble the books on a schedule. On the first morning of each month it exports the previous month’s invoices and expenses as CSV, generates the profit and loss report as PDF, and zips everything into a dated folder your accountant can pull. Try: “On the 1st at 7am, build last month’s accountant pack — invoices and expenses as CSV, P&L as PDF — and put the zip in the accountant folder named by month.”

Because it is a script, the pack is identical every month — same date formats, same columns — and your accountant stops asking where the missing files are. Have it keep the last three packs so you can compare if a number looks odd.

8. Payment reconciliation against Stripe

Gateway payouts and app records drift apart: a charge recorded twice, an invoice marked paid that never settled, a payout with no matching payment. The agent can pull the gateway’s transaction list for the month, match it against Invoice Ninja payments, record what is missing, and hand you a short discrepancy report. Try: “Reconcile September — pull Stripe’s transactions, match them against Invoice Ninja payments, and list anything paid in the gateway but unpaid in the app, or paid twice.”

Run it monthly and the discrepancies stay small and explainable. The agent writes the reconciliation as a script you can re-run, and each run leaves a report you can file with the month’s books.

9. Retainer hours bucket

Sell support in blocks of hours and you need a counter. The agent can track each client’s prepaid hours, compare against time logged on their tasks, warn you at 80 percent used, and draft the top-up invoice when the block runs dry. Try: “Track 20 prepaid support hours for client Kite — when logged task time eats 16 of them, email me and draft an invoice for a block of 20 more.”

10. Monday cash-flow brief

Knowing what is owed, by whom, and since when beats discovering it when rent is due. A scheduled job can email you every Monday: totals due this week, overdue amounts by age, what got collected last week, and the five largest unpaid invoices with contacts. Try: “Every Monday at 8am, email me a cash-flow brief: due this week, overdue by age, collected last week, and the five biggest unpaid invoices.”

See it in action

Official walkthroughs from the Invoice Ninja team:

Worth a watch next:

• Payment Links / Subscriptions! — covers the auto-billing and subscription mechanics behind the recurring workflows.
• Schedule Statements and Email Sending — how scheduled emails run inside the app, complementing the agent-built routines.

Start with one workflow, check the output for a week, then add the next. The agent can also write these as scripts you can inspect. If you do not have a server yet, start here: Invoice Ninja on OpenSysLab.