Invoice Chaser

Legal and finance skill, available on Zeplik

Invoice Chaser is a ready-to-run legal and finance skill on Zeplik. Drafts reminder emails matched to each customer's payment history and tone, gentle to firm. Ask in plain language and Zeplik applies the skill's method for you inside the conversation, on whichever AI model you prefer.

The Invoice Chaser skill loads automatically when your request matches it, or you can invoke it directly by typing /invoice-chase in any chat. It works with attachments, connectors, and any model that supports the task, so you get the same expert method every time without setting anything up.

What the Invoice Chaser skill can do

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How the Invoice Chaser skill works

Invoice Chase

Quick start

Pull the AR aging report, score each customer by payment history, draft a tone-matched reminder for each overdue invoice, and present them to the owner. Nothing sends until the owner says so.

User: "who owes me money"
→ Pull AR aging from QuickBooks
→ Cross-reference PayPal settlements (last 14 days)
→ Score each customer: good-payer / occasionally-late / repeat-late
→ Draft tone-matched reminders
→ Show summary table + drafts. Wait for "send these."

Setup (first run only)

Ask the owner two questions before running for the first time:

  1. Mail connector: "Do you use Gmail or Apple Mail for drafts?" — store the answer; use it for all non-PayPal draft queuing.
  2. Stripe: "Do you use Stripe for invoicing? I can include Stripe invoices in the overdue sweep." — if yes, pull Stripe overdue invoices alongside QuickBooks.

Do not ask again on subsequent runs.

Workflow

  1. Pull overdue receivables. Query QuickBooks AR aging for all invoices more than 1 day past due. If Stripe is enabled (owner confirmed at setup), also pull Stripe overdue invoices.

  2. Cross-reference payment history. For each overdue customer, query PayPal for settled transactions using these parameters:

    • transaction_status: S (settled only — filters out pending and denied transactions that inflate result size and increase rate-limit risk)
    • Date window: last 7 days ending today (not 14 or 30 — wider windows are the primary cause of PayPal 429 rate limit errors)

    If PayPal returns a 429 rate limit error:

    • Retry once immediately with a 3-day window instead.
    • If the retry also returns 429, skip the PayPal cross-reference entirely for this run. Flag all customers in the batch as "PayPal unavailable — verify manually" in the summary table. Proceed to scoring using QuickBooks history only. Do not silently drop the caveat.

    If a customer shows a settled payment within the query window, flag as "possibly paid — verify" and exclude from the draft queue.

  3. Score each customer. Read reference/tone-matching.md for scoring logic. Result: good-payer, occasionally-late, or repeat-late.

  4. Draft reminder emails. One email per customer — consolidate multiple overdue invoices into one email. Match tone to score. See reference/examples/gentle-reminder.md and reference/examples/firm-reminder.md.

  5. Present drafts to owner. Show a summary table first:

    CustomerAmount DueDays LateToneSend via
    Acme Corp$1,20018 daysGentlePayPal
    Smith LLC$45047 daysFirmGmail draft

    Then show each draft email in full. Wait for owner to say "send these" or approve individually.

  6. Send or queue — only after approval.

    • PayPal invoices: send the reminder via PayPal.
    • Non-PayPal invoices: queue as a draft in the owner's configured mail app.
    • Never send without explicit approval.
  7. Report what happened. List what was sent, what was queued as draft, and what was flagged (possibly paid, excluded).

Approval gates

  • Never send or queue a draft without explicit owner approval. Present all drafts first; wait for the go-ahead.
  • Never include a customer who paid in the last 14 days. Flag as "possibly paid — verify" instead.
  • Never send to a customer not in the QuickBooks AR report (or Stripe, if enabled). No reminders from memory alone.
  • One approval covers one batch. Adding a customer or changing a draft after approval starts a new round.

Reference

Zeplik output presentation

Present the final deliverable as a single polished artifact: clear headings, tables where the content is tabular, fenced code where it is code. Lead with the deliverable itself; keep process commentary to a single short line. If the skill produced multiple files or sections, end with a compact list of them with one-line purposes.

How to use the Invoice Chaser skill

  1. Sign in to Zeplik

    Create a free Zeplik account or sign in. New accounts start with free credits, so you can try the Invoice Chaser skill right away.

  2. Describe your legal and finance task

    Ask in plain language, or type /invoice-chase to invoke the skill directly. Zeplik recognizes the Invoice Chaser skill and applies its method.

  3. Review and refine the result

    Zeplik returns a clear, structured answer. Ask follow-ups in the same chat to refine it or take the next step.

Source and credit

Author
Anthropic
License
Apache-2.0

Adapted from the open-source anthropics/knowledge-work-plugins project and tuned to run natively on Zeplik. View source on GitHub.

Frequently asked questions

What is the Invoice Chaser skill?
Invoice Chaser is a ready-to-run legal and finance skill on Zeplik. Drafts reminder emails matched to each customer's payment history and tone, gentle to firm. Ask in plain language and Zeplik applies the skill's method for you inside the conversation, on whichever AI model you prefer.
How do I use Invoice Chaser on Zeplik?
Sign in to Zeplik and ask in plain language, or type /invoice-chase in any chat to invoke it directly. The skill applies its method and returns a result you can refine in the same conversation.
Which AI model does the Invoice Chaser skill use?
Any model you choose. Zeplik works across every model in one chat, so the Invoice Chaser skill runs on your preferred model for the task.
Where does the Invoice Chaser skill come from?
The Invoice Chaser skill is adapted from the open-source anthropics/knowledge-work-plugins project (Apache-2.0) and tuned to run natively on Zeplik. The original source is linked on this page.
How much does the Invoice Chaser skill cost?
Using the skill is free to start. You only spend Zeplik credits when the assistant runs, and new accounts begin with free credits.

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Invoice Chaser - Legal and finance skill for Zeplik AI | Zeplik Chat