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Generate PDF invoices from webhook requests with PDFMint

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Created by: Florian Standhartinger || fstandhartinger
Florian Standhartinger

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Last update 2 days ago

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Generate PDF invoices from webhook data with PDFMint

Who's it for
Anyone whose shop, billing system or internal tool can POST JSON and needs a finished PDF invoice back in the same request — without running a headless browser, and without a template editor to log into.

How it works

  1. Receive invoice data accepts a POST with the customer, the line items and the currency.
  2. Set your company details is the one node you edit: company name, address, VAT rate, payment terms and footer note.
  3. Check the request is complete rejects a request that has no customer or no line items before a PDF is rendered, so a broken payload gets a readable 422 instead of an invoice that says "undefined".
  4. Calculate line totals and VAT does the arithmetic in one place: per-line amounts, subtotal, VAT at your rate, grand total, and the due date derived from your payment terms. The HTML stays a layout, not a calculator.
  5. Render the invoice as PDF builds the document with PDFMint. The layout is plain HTML and CSS inside the node, so you change the design by editing markup.
  6. Did the render succeed? checks the render result. On success Return the PDF answers the original request with the file; if PDFMint could not be reached or refused the job, Explain what went wrong and Return the error as JSON answer with a 422 and the reason. The caller always gets an answer.

How to set up

  • Add a PDFMint credential (free plan: 10 documents a month, no card).
  • Open Set your company details and put in your own company name, address, VAT rate and payment terms.
  • Activate the workflow and POST to the production webhook URL.

Requirements

  • A PDFMint API key from pdf.mintapis.com.
  • ⚠️ This template uses a community node, so it runs on self-hosted n8n only.

How to customize
Edit the HTML in Render the invoice as PDF for your own branding — line items are looped in one expression, so any number of rows works. Set vat_percent to 0 if you do not charge VAT. Swap Return the PDF for a Gmail, Drive or S3 node to deliver the invoice instead of returning it.