Technical Integration API

How to Send E-Invoices Without Changing Your Current System

Invoro Team, E-Invoicing Experts

Invoro Team

E-Invoicing Experts

8 min read
Featured image for How to Send E-Invoices Without Changing Your Current System

One of the biggest concerns we hear from businesses facing e-invoicing mandates is: "Do I have to change everything?" The short answer is no. The right e-invoicing solution works with your existing systems, not against them.

Whether you use QuickBooks, Xero, SAP, or even just Excel and email, you can become Peppol-compliant without starting from scratch.

The Problem with "Rip and Replace" Solutions

Many traditional e-invoicing providers expect you to adopt their entire platform—new invoice templates, new workflows, new training for your team. This approach is expensive, disruptive, and often unnecessary.

Your current invoicing system works for your business. You've customized it, your team knows it, and it integrates with your other tools. Why throw that away?

"The best e-invoicing solution is one you barely notice—it should enhance your existing workflow, not replace it."

Three Ways to Connect to Peppol

Modern Peppol access points offer multiple integration methods, so you can choose the approach that fits your business. Here's how Invoro supports different workflows:

📝

1. Web Form

Perfect for low-volume businesses or occasional invoices

  • ✓ No technical setup required
  • ✓ Fill out a simple form
  • ✓ Invoice sent instantly to Peppol
  • ✓ Great for 1-50 invoices/month
📧

2. Email Forwarding

Keep using your current system—just forward invoices to us

  • ✓ AI extracts invoice data automatically
  • ✓ Works with PDFs, Word docs, or Excel
  • ✓ No integration work needed
  • ✓ Ideal for existing workflows
⚙️

3. API Integration

Direct connection for automation and high volume

  • ✓ RESTful API for developers
  • ✓ Batch processing support
  • ✓ Webhook notifications
  • ✓ Best for 100+ invoices/month

Most businesses start with web forms or email, then graduate to API as their volume grows. Choose what makes sense today—you can always upgrade later. See our pricing tiers for volume details.

Real-World Integration Scenarios

Let's look at how different types of businesses can stay compliant without disruption:

Scenario 1: Small Consulting Firm (5 invoices/month)

Current process: Create invoices in Word, save as PDF, email to clients

New process:

  1. Create invoice in Word as usual
  2. Forward the PDF to invoices@invoro.com
  3. AI processes it and sends via Peppol automatically
  4. You get a confirmation email

Setup time: 5 minutes | Monthly cost: Free tier

Scenario 2: E-Commerce Business (200 invoices/month)

Current process: Invoices generated automatically by e-commerce platform (WooCommerce, Shopify, etc.)

New process:

  1. Connect platform to Invoro API (one-time setup)
  2. Invoice generation happens as normal in your platform
  3. API automatically sends each invoice to Peppol in real-time
  4. Status updates sent back to your platform via webhooks

Setup time: 1-2 hours (with developer) | Monthly cost: €39 + volume

Scenario 3: Mid-Sized Manufacturer (50 invoices/month)

Current process: QuickBooks for accounting, manual invoice creation

New process:

  1. Continue creating invoices in QuickBooks
  2. Export invoice as PDF
  3. Use Invoro web form to upload (30 seconds per invoice)
  4. Or set up email forwarding rule to automate it

Setup time: 15 minutes | Monthly cost: €15

How Email + AI Processing Works

The email forwarding method is particularly popular because it requires zero technical knowledge. Here's what happens behind the scenes:

1

You Send

Forward invoice to your dedicated Invoro email address

2

AI Extracts

Our AI reads the invoice and extracts all key fields automatically

3

Validation

System validates data and converts to Peppol format

4

Delivery

Invoice sent to recipient via Peppol network instantly

The AI handles multiple formats (PDF, Word, Excel, even scanned images) and learns from corrections, getting more accurate over time. If anything looks unclear, you'll get a quick email asking for confirmation before sending.

API Integration for Developers

For businesses with technical resources or high invoice volumes, direct API integration offers maximum control and automation. Here's what the integration looks like:

POST https://api.invoro.com/v1/invoices
Content-Type: application/json
Authorization: Bearer YOUR_API_KEY

{
  "recipient": {
    "name": "ACME GmbH",
    "peppol_id": "9930:DE123456789",
    "address": {...}
  },
  "invoice": {
    "number": "INV-2025-001",
    "date": "2025-01-15",
    "due_date": "2025-02-14",
    "currency": "EUR",
    "line_items": [...],
    "total": 1250.00
  }
}

Example: Send invoice via Invoro API

Key features of the Invoro API:

  • RESTful design – Standard HTTP methods, JSON responses
  • Comprehensive documentation – Interactive API explorer, code samples in multiple languages
  • Webhook support – Real-time notifications when invoices are delivered or fail
  • Batch endpoints – Send multiple invoices in one request
  • Sandbox environment – Test without sending real invoices
  • SDKs available – Client libraries for Node.js, Python, PHP, Java

What About Receiving Invoices?

Compliance isn't just about sending—you also need to be able to receive e-invoices from your suppliers. Here's how Invoro handles incoming invoices:

Receiving Options:

  • 📧 Email delivery: Incoming invoices are automatically forwarded to your accounting email as PDFs
  • 🌐 Web portal: Log in to view, download, and manage all received invoices
  • ⚙️ API access: Retrieve invoices programmatically and feed them directly into your ERP/accounting system
  • 🔗 Webhook push: Get notified instantly when a new invoice arrives

The best part? Receiving invoices is always free, regardless of your plan tier.

Keeping Your Accounting Software

One concern we hear often: "Will this work with my accounting software?" The answer is almost always yes, because Invoro sits alongside your existing tools rather than replacing them.

📊 QuickBooks / Xero

Continue creating invoices as normal. Export to PDF and forward to Invoro, or use our API to sync automatically.

🏢 SAP / Microsoft Dynamics

Direct API integration or middleware connection. Your ERP generates invoices; our API transmits them to Peppol.

📄 Excel / Custom Tools

Email forwarding or web form upload. Create invoices however you want; we handle Peppol transmission.

🛒 E-Commerce Platforms

WooCommerce, Shopify, Magento—if it can generate an invoice, we can send it to Peppol via API or email.

Migration Timeline: What to Expect

Worried about how long this takes to set up? Here's a realistic timeline based on integration method:

Setup Time by Method

  • 5 min
    Web Form
    Sign up, verify email, send first invoice
  • 15 min
    Email Forwarding
    Sign up, configure email forwarding rule, test with one invoice
  • 1-4 hrs
    API Integration (Simple)
    Read API docs, write basic integration, test in sandbox, deploy to production
  • 1-2 days
    API Integration (Complex)
    Custom ERP integration, batch processing, webhook handling, thorough testing

Real Benefits Beyond Compliance

While the primary reason to adopt e-invoicing is compliance, many businesses discover unexpected benefits:

  • 💰 Faster payments: Electronic invoices are processed quicker—many businesses see DSO (days sales outstanding) drop by 20-30%
  • 🎯 Fewer errors: Structured data reduces manual data entry mistakes
  • 📈 Better tracking: Real-time delivery confirmations mean you always know invoice status
  • 🌍 EU-wide invoicing: Once you're on Peppol, invoicing to any EU country works the same way
  • 📊 Improved reporting: Structured invoice data makes financial analysis easier

Start Without Changing a Thing

Choose the integration method that works for you. Web form, email, or API—all roads lead to Peppol compliance. Start with our free tier and upgrade only when you need to.

The Bottom Line

E-invoicing compliance doesn't mean starting over. The right solution adapts to your workflow, not the other way around.

Whether you're a solo consultant forwarding a few invoices per month or an enterprise processing thousands, there's an integration path that fits. Start simple, scale when needed, and keep using the tools that already work for your business.

That's how modern e-invoicing should work—invisible until you need it, flexible when you do.

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