Automating B2B Customer Onboarding with KVK Data

Every B2B business knows the ritual. A new customer signs up, and the email chain begins. “What’s your KVK number?” “Can you confirm your VAT number?” “Which address should we use for invoicing?” “Is this the correct name for the contract?”

It’s time-consuming, error-prone, and completely unnecessary. Every Dutch business customer is already registered in the Trade Register. That data is publicly available, current, and accessible via the KVKBase API in real time. You don’t need to ask for it again. You just need to fetch it.

What a slow onboarding actually costs

Slow onboarding has real costs. A deal that’s been closed but takes weeks to activate means delayed invoicing, contracts that aren’t signed on time, and team members manually copying data out of email threads.

Beyond the operational cost, the onboarding experience is your customer’s first real interaction after saying yes. If it’s messy and manual, you’re asking someone who just committed to your product to wait and do paperwork. That’s a missed opportunity to build confidence early.

With KVK data as a foundation, you can automate most of that process.

From KVK number to full customer profile

The concept is simple. In your onboarding form, you ask for exactly one thing: the KVK number. Everything else comes from the API.

A single call to the KVKBase API gives you:

• Company name and trade name for contracts and invoices
• Legal form (sole proprietorship, BV, VOF…) for the right contract structure
• Business address for billing and correspondence
• VAT number when available
• SBI codes to automatically segment the company in your CRM
• Status to confirm the business is active

All of that is available before your customer has filled in any other field.

Practical implementation

A typical onboarding flow looks like this:

Step 1: KVK number input

<input type="text" id="kvk" placeholder="KVK number (8 digits)" maxlength="8" />
<button onclick="fetchCompany()">Fetch company details</button>

Step 2: API call from frontend or backend

async function fetchCompany() {
  const kvk = document.getElementById('kvk').value.trim();
  const response = await fetch(`https://api.kvkbase.nl/v1/companies/${kvk}`, {
    headers: { 'Authorization': 'Bearer YOUR_API_KEY' }
  });
  const data = await response.json();
  prefillForm(data);
}

function prefillForm(company) {
  document.getElementById('name').value = company.name;
  document.getElementById('address').value = company.address.street + ' ' + company.address.houseNumber;
  document.getElementById('city').value = company.address.city;
  document.getElementById('postalCode').value = company.address.postalCode;
  document.getElementById('legalForm').value = company.legalForm;
}

Step 3: Validate before proceeding

Check the status field. A dissolved or suspended business shouldn’t be onboarded without a manual review. See KVK company status monitoring for how to track this over time.

if (company.status !== 'active') {
  showWarning('This company has a non-standard status. Please review manually.');
  return;
}

Connecting to downstream systems

Once collected, the data flows into your subsequent processes:

Automatic CRM entry. No more manual input in HubSpot, Salesforce, or Pipedrive. The API response writes directly to your CRM. Segment automatically by SBI code to assign the right salesperson or onboarding track.

Contract generation. With the official company name and legal form from the Trade Register, you can generate contracts that are legally accurate from the start. A BV agreement looks different from a sole proprietorship contract, and you can handle that difference programmatically.

Invoice setup. Billing details including the VAT number get populated automatically. Your accounting system receives a complete customer record without manual entry. Read how e-invoicing and KVK data work together for more context.

Data accuracy

A common question: what if the Trade Register data is out of date?

The risk is real but manageable. The KVK register is maintained by the businesses themselves, and most companies keep their data current because they’re legally required to. In practice, for the vast majority of active businesses, the data is correct and recent.

For extra confidence, show the prefilled data to the customer and ask them to confirm or correct it. You’re giving them far less to type than before, and you get a built-in double check.

What you save

The gains appear on multiple levels:

• Time saved for your team: no manual data entry, no back-and-forth emails chasing company details
• Fewer errors: misspelled company names, transposed VAT numbers, wrong addresses, all eliminated
• Faster activation: a customer onboarded in ten minutes starts using your product sooner
• Better customer experience: professional, fast, and frictionless

For businesses handling multiple B2B onboardings per week, that adds up to hours saved every week.

Getting started

The KVKBase API has a free tier for developers. You can build, test, and refine your onboarding integration without needing a paid plan from day one. Check the documentation and quickstart to get started today.

The integration pays for itself within the first ten customers.