Automated Invoice Generation with Liquid Templates

5 min integration

PDF Output

Popular Use Case

Transform your billing data into professional PDF invoices with our Liquid template API. Perfect for SaaS platforms, e-commerce sites, and any business that needs automated invoice generation.

<!-- Invoice Template Example -->
<div class="invoice-header">
  <h1>INVOICE #{{ invoice.number }}</h1>
  <p>Date: {{ invoice.date | date: "%B %d, %Y" }}</p>
</div>

<div class="billing-info">
  <div class="from">
    <h3>{{ company.name }}</h3>
    <p>{{ company.address }}</p>
    <p>{{ company.city }}, {{ company.country }}</p>
  </div>
  
  <div class="to">
    <h3>Bill To:</h3>
    <p>{{ customer.name }}</p>
    <p>{{ customer.address }}</p>
    <p>{{ customer.email }}</p>
  </div>
</div>

<table class="invoice-items">
  <thead>
    <tr>
      <th>Description</th>
      <th>Quantity</th>
      <th>Rate</th>
      <th>Amount</th>
    </tr>
  </thead>
  <tbody>
    {% for item in invoice.items %}
    <tr>
      <td>{{ item.description }}</td>
      <td>{{ item.quantity }}</td>
      <td>{{ item.rate | currency }}</td>
      <td>{{ item.total | currency }}</td>
    </tr>
    {% endfor %}
  </tbody>
  <tfoot>
    <tr>
      <td colspan="3">Subtotal</td>
      <td>{{ invoice.subtotal | currency }}</td>
    </tr>
    <tr>
      <td colspan="3">Tax ({{ invoice.tax_rate }}%)</td>
      <td>{{ invoice.tax | currency }}</td>
    </tr>
    <tr class="total">
      <td colspan="3">Total</td>
      <td>{{ invoice.total | currency }}</td>
    </tr>
  </tfoot>
</table>

Key Benefits for Your Business

  • Professional Design: Generate beautifully formatted PDF invoices that match your brand
  • Multi-Currency Support: Built-in filters for currency formatting in any locale
  • Tax Calculations: Automatic tax calculations with customizable rates
  • CRUD Integration: Simple REST API integrates with any database or CRM

"We reduced our invoice generation time from hours to seconds. The API integrates perfectly with our existing CRUD operations, and the PDF quality is exceptional."

- Sarah Chen, CTO at CloudBilling

Integration Example

// Generate invoice after successful payment
const generateInvoice = async (orderId) => {
  // Fetch order data from your database
  const order = await db.orders.findOne({ id: orderId });
  
  // Call our API to generate PDF
  const response = await fetch('https://api.liquidrender.com/v1/render', {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer YOUR_API_TOKEN',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      template_id: 'invoice-template',
      data: {
        invoice: {
          number: order.invoice_number,
          date: order.created_at,
          items: order.items,
          subtotal: order.subtotal,
          tax_rate: order.tax_rate,
          tax: order.tax_amount,
          total: order.total
        },
        customer: order.customer,
        company: companyDetails
      },
      output: 'pdf'
    })
  });
  
  const { pdf_url } = await response.json();
  
  // Save PDF URL to your database
  await db.invoices.create({
    order_id: orderId,
    pdf_url: pdf_url,
    created_at: new Date()
  });
  
  return pdf_url;
};

Your invoice PDFs are generated and stored securely in our German data centers for 7 days, giving you time to download or forward them to customers. After 7 days, all data is automatically deleted to ensure privacy.

Start Generating InvoicesView API Documentation