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Bizyness
API for developers

Integrate compliant invoicing and VAT into your SaaS

An API for SaaS, marketplaces, training platforms: compliant invoicing, EU VAT, IOSS and FEC exports.

REST API
Secure auth
Dev friendly
Webhooks
Start free 14-day trial No credit card required Book a demo

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POST /v1/invoices

{

"customer": "john@company.com",

"country": "DE",

"currency": "EUR",

"total": 149.00

}

VAT calculated automatically
bizyness. hello@email.com +91 00000 00000
Invoice #AB2324-01
Billed to Company Name Company address City, Country - 00000 +0 (000) 123-4567
Invoice date01.08.2023
Due date15.08.2023
Amount due 4,500.00 €

Digital product design

Title / DescriptionSubtotal
1  Service name
01 Jul - 20 Jul · Hours log ↗ 3,000.00 €
2  Service name
21 Jul - 31 Jul 1,500.00 €
Total4,500.00 €

Please pay within 15 days of receiving this invoice.

Thank you for the business!

Payment info
Account Name
Business address, City, IN Bank name
ABCD BANK Swift
ABCDUSBBXXX Account #
37474892300011
Generated automatically

JSON Response

"id": "inv_2026-1048",

"status": "paid",

"pdf_url": "https://...",

"vat_rate": "19%",

"country": "DE"

}

200 OK

Webbook

  • Invoice generated
  • Invoice sent
  • Vat report updated
Real-time synchronized

All the complexity of online sales becomes your problem

Complex EU VAT

OSS/IOSS, digital products, varying rules by country, refunds, exemptions...

Difficult compliant invoicing

Numbering, credit notes, PDFs, fiscal archiving, French and European requirements.

Ongoing tax maintenance

Rules change constantly. Your product team shouldn't have to manage that.

One sale triggers everything

  1. Your application sends a sale

  2. Bizyness automatically calculates VAT

  3. The compliant invoice is generated

  4. Tax reports and accounting exports are updated

Triggered by every sale

Works with any e-commerce platform

SaaS & subscriptions

Stripe, Paddle, recurring subscriptions, usage-based billing.

Training platforms

Automatic invoices for courses, coaching and digital content.

Marketplaces

Vendor management, commissions and international VAT.

ERPs & internal tools

Add a compliance and invoicing layer without rebuilding the tax logic.

Everything to invoice compliantly across Europe

Automatic invoices & credit notes

Compliant PDF invoices generated automatically after each sale or refund.

Automated EU VAT

Automatic VAT rate calculation based on country, customer, and product type.

OSS/IOSS reports

Automatically prepare your European declarations.

Modern REST API

Complete documentation, SDKs and libraries.

Multi-currency & multi-language

Compatible with international sales.

Accounting export (FEC)

Exports ready for your accountant.

Real-time webhooks

Receive events for VAT, invoice generation, payment, and refunds.

Node.js Python PHP cURL
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// Create an invoice

const Bizyness = require('bizyness');

const bizyness = new Bizyness('test_key');

const invoice = await bizyness.invoices.create({

customer: {

email: 'john@company.com',

country: 'FR'

},

total: 14000,

currency: 'EUR',

items: [

{ description: 'Premium Subscription', amount: 12500 }

]

});

console.log(invoice.id); // inv_2026-1048

Result

  • PDF invoice generated
  • VAT calculated
  • Accounting export updated
  • Webhook sent

Compliance, automatically up to date

Everything you need to run your business with confidence

NF525 & NF203

Compliant invoices

Made in France

Data hosted in Europe

GDPR compliant

Secured & encrypted data

10-year archiving

Legally preserved docs

Always compliant

Auto regulatory updates

It's exactly what I needed: an easy-to-use interface that's optimized to the max.
TOT VA BOX E-commerce seller

Frequently Asked Questions

What is the Bizyness API for, and who is it aimed at?

It lets you embed compliant invoice generation and EU VAT calculation directly into your product: SaaS, marketplaces, course platforms, ERPs or e-commerce apps. You add a compliance layer without rebuilding the tax logic yourself.

When should I use the API rather than a native integration?

The API is ideal for custom cases or platforms with no native integration: you connect your application directly and drive invoicing and VAT according to your own business logic.

Does the API offer webhooks to track events in real time?

Yes. Webhooks notify you in real time of key events, invoice generated, invoice sent, payment, refund, VAT report updated, so you can sync your system without constant polling.

Do I need to be a developer, and are there SDKs?

The REST API is designed for technical teams, with full documentation and examples in Node.js, Python, PHP and cURL. Integration usually takes a few days rather than months of in-house development.

Do VAT and accounting exports also work through the API?

Yes. Each sale you send triggers automatic VAT calculation based on country and product, generation of the compliant PDF invoice, and updates to your OSS/IOSS reports and FEC exports.

How do I secure and authenticate my API calls?

Every integration relies on a personal API key and encrypted HTTPS exchanges. You stay in control of your access and can revoke it at any time from your account.

Integrate tax compliance in days, not months.

Bizyness handles VAT, invoices and compliance, so your team can focus on the product.

Start free 14-day trial No credit card required Book a demo
  • Automatic invoices
  • VAT & OSS/IOSS
  • Accountant-ready exports
  • 14-day free trial
  • No credit card required
  • Full access
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