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bunq C# SDK


Hi developers!

Welcome to the bunq C# SDK! 👨‍💻

We're very happy to introduce yet another unique product: complete banking SDKs! Now you can build even bigger and better apps and integrate them with your bank of the free! 🌈

Before you dive into this brand new SDK, please consider:

Give us your feedback, create pull requests, build your very own bunq apps and most importantly: have fun! 💪

This SDK is in beta. We cannot guarantee constant availability or stability. Thanks to your feedback we will make improvements on it.


The sdk_csharp is hosted on nuget.

Install-Package Bunq.Sdk

dotnet add package Bunq.Sdk


Creating an API context

In order to start making calls with the bunq API, you must first register your API key and device, and create a session. In the SDKs, we group these actions and call it "creating an API context". The context can be created by using the following code snippet:

var apiContext = ApiContext.Create(ApiEnvironmentType.SANDBOX, API_KEY, DEVICE_DESCRIPTION);

Please note: initializing your application is a heavy task, therefore, all calls in the example above except for LoadApiContext should be executed once.

After saving the context, you can restore it at any time:

var apiContext = ApiContext.Restore(API_CONTEXT_FILE_PATH);

Tip: both saving and restoring the context can be done without any arguments. In this case the context will be saved to/restored from the bunq.conf file in the same folder with your executable.


For an example, see this tinker snippet


It is possible to create an ApiContext as PSD2 Service Provider. Although this might seem a complex task, we wrote some helper implementations to get you started. You need to create a certificate and private key to get you started. Our sandbox environment currently accepts all certificates, if these criteria are met:

  • Up to 64 characters
  • PISP and/or AISP used in the end.

Make sure you have your unique eIDAS certificate number and certificates ready when you want to perform these tasks on our production environment. Due to the implementation used in this SDK, you should create a .pfx credentials file containing your certificate and private key. Creating a pfx file can be done with the following command: openssl pkcs12 -inkey private.pem -in chain.cert -export -out credentials.pfx

Creating a PSD2 context is very easy:

ApiContext apiContext = ApiContext.CreateForPsd2(
    ApiEnvironmentType.SANDBOX, // Could be ApiEnvironmentType.PRODUCTION as well
    new List<string>()

This context can be saved the same way as a normal ApiContext. After creating this context, create an OAuth client to get your users to grant you access. For a more detailed example, check the tinker_csharp repository.

Safety considerations

The file storing the context details (i.e. bunq.conf) is a key to your account. Anyone having access to it is able to perform any Public API actions with your account. Therefore, we recommend choosing a truly safe place to store it.

Making API calls

There is a class for each endpoint. Each class has functions for each supported action. These actions can be Create, Get, Update, Delete and List.

Sometimes API calls have dependencies, for instance MonetaryAccount. Making changes to a monetary account always also needs a reference to a User. These dependencies are required as arguments when performing API calls. Take a look at for the full documentation.

The user dependency will always be determined for you by the SDK. For the monetary account, the SDK will use your primary account (the one used for billing) if no monetary account id is provided.

Creating objects

When creating an object, the default response will be the id of the newly created object.


For an example, see this tinker snippet

See PaymentSample.cs

NotificationFilters / Callbacks

Note! Due to an in internal change in the way we handle NotificationFilters (Callbacks), you should not use the default classes included in this SDK. Please make sure you make use of the associated Internal-classes. For example when you need NotificationFilterUrlUser, make use of NotificationFilterUrlUserInternal. You can use every method of these classes, except for the create() method. Always use createWithListResponse() instead.


Reading objects

Reading objects can be done via get and list methods. For get a specific object id is needed while for list will return a list of objects.


For an example, see this tinker snippet

Updating objects

Updating objects through the API goes the same way as creating objects, except that also the object to update identifier (ID or UUID) is needed.


For an example, see this tinker snippet

Deleting objects

When an object has been deleted, the common respinse is an empty response.



Running Samples

If you want to play around with the SDK before you actually start implementing something awesome you can use the tinker project and adjust the code in the scripts as you please.

Running tests

Information regarding the test cases can be found in the located in test.


The SDK can throw multiple exceptions. For an overview of these exceptions please take a look at