Invoice Generator API

We created a simple API at Invoiced to generate invoice PDFs on the fly. This service has been used internally by us for some time. We believe this could be helpful in your project as well.

The API has a primary endpoint that returns a PDF given details of an invoice. We don't store any of your invoice data.

In addition to PDF, the API can also generate e-invoices in UBL (Universal Business Language) with the invoice PDF embedded. This is useful as the world shifts to e-invoicing because UBL invoices are tricky to generate.

Use Cases

• Creating invoices for VAT compliance
• Generate a PDF of an invoice that you have the details to (recipient, line items, etc)
• Produce invoices for B2B buyers from an order or receipt
• Selling products or services on credit terms
• Creating e-invoices in UBL (Universal Business Language)

Table of Contents

• Examples
  • Simple Invoice
  • JSON Input
  • VAT Invoice
  • Localization
  • Custom Fields
  • E-invoice
  • Sample Projects
• API Reference
  • Create Invoice PDF
  • Create E-invoice
• Rate Limiting
• Support

Examples

Simple Invoice

curl https://invoice-generator.com \
  -d from="Invoiced, Inc." \
  -d to="Acme, Corp." \
  -d logo="https://invoiced.com/img/logo-invoice.png" \
  -d number=1 \
  -d date="Feb 9, 2015" \
  -d due_date="Feb 16, 2015" \
  -d items[0][name]="Starter plan monthly" \
  -d items[0][quantity]=1 \
  -d items[0][unit_cost]=99 \
  -d notes="Thanks for being an awesome customer!" \
  -d terms="Please pay by the due date." \
> invoice.pdf

VAT Invoice

Here's a simple cURL example for generating invoices with VAT:

curl https://invoice-generator.com \
  -d from="Invoiced, Inc.%0AVAT ID: 1234" \
  -d to="Jared%0AVAT ID: 4567" \
  -d logo="https://invoiced.com/img/logo-invoice.png" \
  -d number=1 \
  -d date="Feb 9, 2015" \
  -d payment_terms="Charged - Do Not Pay" \
  -d items[0][name]="Starter Plan Monthly" \
  -d items[0][quantity]=1 \
  -d items[0][unit_cost]=99 \
  -d tax_title="VAT" \
  -d fields[tax]="%" \
  -d tax=8 \
  -d notes="Thanks for being an awesome customer!" \
  -d terms="No need to submit payment. You will be auto-billed for this invoice." \
> invoice.vat.pdf

JSON Input

JSON input is also accepted with the Content-Type header set to application/json

curl https://invoice-generator.com \
  -H "Content-Type: application/json" \
  -d '{"from":"Invoiced, Inc.","to":"Acme, Corp.","logo":"https://invoiced.com/img/logo-invoice.png","number":1,"items":[{"name":"Starter plan","quantity":1,"unit_cost":99}],"notes":"Thanks for your business!"}' \
> invoice.pdf

Localization

It is possible to change the localization used to generate the invoice by supplying a locale in the Accept-Language header. The default locale is en-US.

curl https://invoice-generator.com \
  -H "Accept-Language: fr-FR" \
  -d from="Invoiced, Inc." \
  -d to="Acme Corp." \
  -d logo="https://invoiced.com/img/logo-invoice.png" \
  -d number=1 \
  -d currency=eur \
  -d date="Feb 9, 2015" \
  -d due_date="Feb 16, 2015" \
  -d items[0][name]="Starter plan monthly" \
  -d items[0][quantity]=1 \
  -d items[0][unit_cost]=99 \
> invoice.pdf

Supported Languages

We currently have translations available in English, French, German, Spanish, and Thai.

Custom Fields

curl https://invoice-generator.com \
  -d from="Invoiced, Inc." \
  -d to="My Customer" \
  -d ship_to="Shipping Address" \
  -d logo="https://invoiced.com/img/logo-invoice.png" \
  -d number=1 \
  -d date="Feb 9, 2015" \
  -d custom_fields[0][name]="My Custom Field" \
  -d custom_fields[0][value]="Some Value" \
  -d items[0][name]="Starter Plan Monthly" \
  -d items[0][quantity]=1 \
  -d items[0][unit_cost]=99 \
> invoice.custom_fields.pdf

E-invoice

Here's a simple cURL example for generating e-invoices in UBL XML:

curl https://invoice-generator.com/ubl \
  -d from="Invoiced, Inc.%0AVAT ID: 1234" \
  -d to="Jared%0AVAT ID: 4567" \
  -d logo="https://invoiced.com/img/logo-invoice.png" \
  -d number=1 \
  -d date="Feb 9, 2015" \
  -d date="Mar 9, 2015" \
  -d payment_terms="NET 30" \
  -d "items[0][name]"="Starter Plan Monthly" \
  -d "items[0][quantity]"=1 \
  -d "items[0][unit_cost]"=99 \
  -d tax_title="VAT" \
  -d "fields[tax]"="%" \
  -d tax=8 \
  -d notes="Thanks for being an awesome customer!" \
> invoice.xml

Sample Projects

• Go: generate invoices programmatically
• Ruby: generate invoices from Stripe webhooks
• Node.js: invoice-generator.js
• PHP: generate invoices programmatically
• Python: python-invoice-generator

API Reference

Create Invoice PDF

POST https://invoice-generator.com

Invoice Parameters

When a value is null or zero, the field will not be shown on the invoice. The exception to this are the required fields from, to, date, and items.

Line Item Parameters

Line items are represented as an array of objects. Here's an example:

{
  "items": [
    {
      "name": "Gizmo",
      "quantity": 10,
      "unit_cost": 99.99,
      "description": "The best gizmos there are around."
    },
    {
      "name": "Gizmo v2",
      "quantity": 5,
      "unit_cost": 199.99
    }
  ]
}

Subtotal Line Parameters

The fields object toggles the discounts, tax, and shipping subtotal lines. Each setting can have a value of %, true, or false. For example to add a percent tax rate and flat shipping to your invoice you would send this:

{
  "fields": {
    "tax": "%",
    "discounts": false,
    "shipping": true
  },
  "tax": 7,
  "shipping": 15
}

Custom Field Parameters

Custom fields allow you to add additional fields to the invoice details in the top-right. Here's an example:

{
  "custom_fields": [
    {
      "name": "Gizmo",
      "value": "PO-1234"
    }
    {
      "name": "Account Number",
      "value": "CUST-456"
    }
  ]
}

Invoice Template Parameters

These parameters control the titles of the fields on the invoice template. If localization is used, the default values are translated to the specified language. Any invoice template parameter given will override the localized default.

Create E-invoice

POST https://invoice-generator.com/ubl

Parameters

Creating an invoice with universal business language uses the same parameters as the Create Invoice PDF endpoint.

Rate Limiting

The invoice-generator.com API is rate limited. With almost every use case this should not be an issue. If an API call does trigger rate limiting then we will respond with a 429 status code to let you know to try generating your invoice again later. If you frequently run into these limits then you might also consider using our paid service at invoiced.com.

Support

Have a feature request or bug report? We would love to hear your thoughts! You can create an issue on GitHub for any issues you encounter or feature requests.

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