If you need any help, don't hesitate to check our support resources.


Provide feedback on what you think about the new REST API. 

Step by step to connect

Below you can find a detailed step by step on how to connect to the Visma Nmbrs REST API:

1. Sign up to Become a Partner form on the AppStore

The is where all our integrations are available. Right now the REST API is only available for partners who intend to be part of our public marketplace.

To make sure there is a good connect fit, we expect partners to sign up to the partner form. Then, the Integration Partner Manager will reach out to schedule a (virtual) coffee. The coffee is not a blocker to do the following steps, we recommend to already sign up and subscribe to the product to speed up.

2. Sign up to Nmbrs Developer Portal

To use the Nmbrs REST API, the developer must be sign up to the developer portal and have an active login. 

3. Subscribe to a product

After signing up, it's necessary to a subscribe to a product, which will generate a subscription key which must be used on every API request. 

4. Create a Nmbrs account

To be able to test the API, it's necessary to have a Nmbrs test account. It's very important to follow the instructions on Create a Nmbrs account.

5. Register your app 

Fill in the register your app form with the necessary details. With that data, the Nmbrs Team will provide a client_id and client_secret

We will only provide the credentials after the partner getting to know our integration team, see step 1. Still, you experiment with everything that is available on the REST API using our Mock Servers.

6. Use the API 

Read the documentation on how to authenticate, explore which API endpoints are available and what errors means. 

Mock Server

Before getting into the details on how to connect, you can explore the mock server for the Nmbrs REST API! With it, you can see how the responses will look like and experiment with the endpoints.

You can see very easily how the API will work. TRY IT!

API Mock server

Technical documentation

When all the steps above are done, you can go through the technical documentation and find: