How to use

Kredietcheck Zakelijk

Get your API key

API keys are unique codes that identify you or your application each time you make a call to one of our API’s. To make API requests you will need an API Key. Please register via Request API key in order to receive your credentials.

Run sample requests

You access PostNL DataSolutions API’s without writing any code. Just use this .json file import this in Postman on your preferred OS.

Your test account allows you to play with input & output. By default this test account is limited to 250 calls. In case of questions, use the contact details sent to you by email to confirm your (test)account. After setting up your API, please read the Documentation tab to find a Postman import file, samples and field details.

Read the documentation

Get familiar with our API Documentation and inform yourself before integrating any of our services. Implementation of PostNL API’s requires expertise and resources by (a) qualfied developer(s).

Go to production

If testing went well and you like what you see, you can apply for a paid production account. In order to fully integrate the API’s into your website, e-commerce platform and/or backend application(s), you need a production account. While registering as a PostNL customer you receive personalized login credentials for Quota Manager, for accessing and managing your API key(s) and quota.

Do you already have a PostNL DataSolutions contract number and you don’t use the PostNL DataSolutions API’s? Please contact your Account Manager or fill out this form. See Quota Manager for managing your keys and usage.


Components of the Kredietcheck Zakelijk Nationaal

This product includes four API’s to receive information. The fifth API (Company Search API) allows you to search the “company identification number” of the company you want to the details from. This “company identification number” is required input for all four API’s:

  1. Company Search API - API allows to search the company you want to request a credit report for
  2. Credit Flag API - API that delivers a Credit Flag of the requested company.
  3. Credit Advice API - API that delivers a Credit Advice of the requested company.
  4. Creditworthiness API - API that delivers a Credit Flag and a Credit Advice of the requested company.
  5. Creditworthiness API Large - API that delivers a Credit Flag, Credit Advice and PD Rating of the requested company.

See Documentation for detailed API settings and fields.

Implementing the services

Calling a service

A service is called by sending a message to a service endpoint. The message contains a header with your APIkey (apikey) and ContentType (application/json) and a body which contains the service method and related parameters.

Below you can see examples of the header and body, within Postman (an API tool to visualize APIs). Please note: the content used is purely for illustration purposes.

See the example header below.

* You can replace “{{apikey}}” with your API key, or choose to keep {{apikey}} and define your API key in the Postman Environments

* You can replace “{{URL}}” with the url of your API, or choose to keep {{url}} and define the url in the Postman Environments Note that url is a combination of the basic path – – followed by the address of each specific API. Be sure to use your CAPS wisely.

Each message that is received by the API is authenticated and authorized. This mechanism determines if the user has access to the requested service.

Use the ‘Manage environments’ in the top-right corner, to setup up the common part of the url:

Now you are ready to test.

After processing the request, the service will return a message with a response. The message contains a body with the information.

Here’s a POST-example body with input and output. Adjust the fields to your specific API accordingly:

Be aware that some API’s use a POST method and others use GET. In case of GET, define your parameters like this, to your specific API accordingly:

Parameter specification & field order

It is advised to maintain the exact order of the fields as specified in the documentation tab. Changing the order of fields can result in unspecified errors returned back at the client.


Each API is secured with an API key. Your account for managing keys and credits is secured with a username and a password via API Manager. 

In case of questions about Quota Manager, use the contact details sent to you by email to confirm your (test)account.

Example code

The Kredietcheck Zakelijk uses a GET method (as in: not POST).