# How to Automate Invoice Generation in Bubble

- Tool: Bubble
- Difficulty: Beginner
- Time required: 25-30 min
- Compatibility: All Bubble plans (paid for backend workflows)
- Last updated: March 2026

## TL;DR

Automating invoice generation in Bubble involves creating invoices triggered by payment events or scheduled monthly for subscriptions, generating professional PDF invoices, and auto-emailing them to customers. This tutorial covers building the invoice data model, triggering invoice creation on Stripe payment events, scheduling monthly subscription invoices via backend workflows, generating PDF invoices using a plugin, and automatically emailing invoices to customers.

## Overview: Automated Invoice Generation in Bubble

This tutorial shows you how to automate the entire invoice lifecycle in your Bubble app — from creation on payment to PDF generation and email delivery.

## Before you start

- A Bubble app on a paid plan (backend workflows required)
- A payment system set up (Stripe recommended)
- Basic understanding of Backend Workflows and Data Types
- Familiarity with email sending in Bubble

## Step-by-step guide

### 1. Design the invoice data model

Create an 'Invoice' Data Type with fields: invoice_number (text — auto-generated sequential), customer (User), items (list of InvoiceItems), subtotal (number), tax_amount (number), total (number), status (text — draft/sent/paid), due_date (date), paid_date (date), and payment_reference (text — Stripe charge ID). Create 'InvoiceItem' with: description (text), quantity (number), unit_price (number), and line_total (number). Auto-generate invoice numbers using a counter stored in an app settings Data Type.

**Expected result:** Invoice and InvoiceItem Data Types support professional invoice records.

### 2. Trigger invoice creation on payment events

Create a backend workflow called 'create_invoice_on_payment'. If using Stripe webhooks, trigger this when a checkout.session.completed or payment_intent.succeeded event arrives. The workflow creates an Invoice with the customer from the payment data, creates InvoiceItems from the purchased products, calculates subtotal and tax, sets status to 'paid' and paid_date to current date, and stores the Stripe charge ID as payment_reference. This ensures every payment automatically generates an invoice.

**Expected result:** Invoices are created automatically whenever a payment is processed.

### 3. Schedule monthly subscription invoices

For subscription-based billing, create a scheduled backend workflow called 'generate_monthly_invoices' that runs on the 1st of each month. It searches for all active subscribers, creates an Invoice for each one with their subscription items and pricing, sets the due_date to 15 days from now, and sets status to 'draft'. After creation, the workflow can either auto-send the invoice email or queue it for review. Re-schedule the workflow for next month's 1st.

> Pro tip: Add a check to avoid duplicate invoices — search for existing invoices for this customer in the current billing period before creating a new one.

**Expected result:** Subscription invoices are automatically generated on the first of each month.

### 4. Generate PDF invoices

Install a PDF generation plugin like '1T - PDF' or 'PDF Conjurer' from the Bubble marketplace. Create an invoice template page that displays all invoice data in a print-friendly layout: company logo, invoice number, dates, customer details, itemized table, subtotal, tax, total, and payment terms. Use the PDF plugin to convert this page to a PDF file. Store the generated PDF URL on the Invoice record. The PDF can be generated on invoice creation or on demand when the customer or admin requests it.

**Expected result:** Professional PDF invoices are generated from your invoice data.

### 5. Auto-email invoices to customers

After invoice creation and PDF generation, add an email sending step to your workflow. Send an email to the customer with: subject 'Invoice #[number] from [company]', body containing a summary (invoice number, total, due date), and the PDF attached or linked. For Stripe-triggered invoices, send immediately. For monthly subscription invoices, schedule the email for business hours. Track email delivery by adding a 'sent_at' date field to the Invoice and updating it when the email is sent.

**Expected result:** Customers automatically receive invoice emails with PDF attachments after each payment or on the billing schedule.

## Complete code example

File: `Workflow summary`

```text
AUTOMATED INVOICE SYSTEM SUMMARY
=====================================

DATA MODEL:
  Invoice: invoice_number, customer, items,
    subtotal, tax_amount, total, status,
    due_date, paid_date, payment_reference,
    pdf_url, sent_at
  InvoiceItem: description, quantity,
    unit_price, line_total

TRIGGER: PAYMENT EVENT
  Stripe webhook → create_invoice_on_payment
  1. Create Invoice (status: paid)
  2. Create InvoiceItems from order
  3. Calculate totals
  4. Generate PDF
  5. Email to customer

TRIGGER: MONTHLY SCHEDULE
  Backend workflow: 1st of each month
  1. Search active subscribers
  2. Check for duplicate invoices
  3. Create Invoice (status: draft)
  4. Create InvoiceItems from subscription
  5. Generate PDF
  6. Email to customer
  7. Re-schedule for next month

PDF GENERATION:
  Plugin: 1T - PDF or PDF Conjurer
  Template page: invoice layout
  Output: PDF URL stored on Invoice

EMAIL:
  Subject: Invoice #[number] from [company]
  Body: summary + link to PDF
  Track: sent_at date on Invoice

NUMBERING:
  AppSettings record → last_invoice_number
  Increment on each new invoice
  Format: INV-2026-0001
```

## Common mistakes

- **Not generating unique sequential invoice numbers** — Many jurisdictions require sequential, unique invoice numbers for tax compliance Fix: Use a counter stored in a singleton Data Type record, incrementing it atomically for each new invoice
- **Creating duplicate invoices for the same payment** — Webhooks can fire multiple times. Without deduplication, you generate multiple invoices for one payment. Fix: Check for existing invoices with the same payment_reference before creating a new one
- **Calculating tax incorrectly or not at all** — Tax compliance varies by jurisdiction. Omitting tax can create legal issues. Fix: Integrate a tax calculation service or apply the correct tax rate based on customer location

## Best practices

- Generate unique sequential invoice numbers for tax compliance
- Deduplicate invoice creation when processing webhooks
- Store PDF copies of all invoices for record keeping
- Track email delivery status on each invoice
- Include all legally required information on invoices
- Schedule subscription invoices with duplicate prevention
- Archive invoices rather than deleting them

## Frequently asked questions

### What information must be on an invoice?

Typically: invoice number, date, seller details, buyer details, itemized list with quantities and prices, subtotal, tax, total, and payment terms. Requirements vary by jurisdiction.

### Can I customize the invoice PDF design?

Yes. Create a template page in Bubble with your desired layout and branding. The PDF plugin converts this page to PDF, so full design control is available.

### How do I handle refunds on invoices?

Create a credit note (negative invoice) referencing the original invoice. Do not delete the original invoice — create a new record for the refund.

### Can I support multiple currencies?

Yes. Add a currency field to Invoice and format amounts accordingly. Ensure tax calculations account for the correct currency.

### Do I need a paid Bubble plan for this?

Yes. Backend workflows and scheduled workflows require a paid plan. The invoice Data Types and PDF generation work on any plan.

### Can RapidDev help set up automated invoicing?

Yes. RapidDev can build complete invoicing systems in Bubble including automated generation, PDF output, tax calculation, multi-currency support, and integration with accounting software.

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Source: https://www.rapidevelopers.com/bubble-tutorial/automate-invoice-generation-in-bubble
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