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Get bunq2ynab to run on AWS Lambda.
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Get bunq2ynab to run on AWS Lambda.

Setting up AWS Lambda

  • Go to AWS Lambda and click 'Create function'
    • We're going with the default 'Author from scratch'
  • Name it anything you like
  • Runtime: Python3.8
  • Role:
    • Create new role from template
    • Name it anything you like
    • No need to choose a template
  • Click 'Create function'

Uploading the code

Once you've created the function, you can upload the zipfile from this repository. For completeness and transparancy, I've included all files in the zipfile in this repositories' 'bunq2ynab' directory.

The zipfile contains modified code from the GitHub repository above. Many thanks to wesselt for his work in implementing both YNAB and bunq APIs!

The changes I have made concern the storing of the bunq and YNAB access keys/tokens. They are no longer stored in a file but in an environment variable.

The reason we need to upload a zipfile with the Python sourcecode, is that Lambda comes without any Python modules installed, so we create a deployment package with all needed modules.

Creating your own deployment package

If you want to create your own zipfile, run ./ This will build a docker image (so you need docker) and run it, which will recreate the and copy it into the current directory.

Uploading the deployment package

  • At 'Function code', select 'Upload a .ZIP file' under 'Code entry type'
  • Click 'Upload' and select the zipfile (from this repository or your own customized one)
  • Click Save

Configuring AWS Lambda

  • Set the Timeout under 'Basic Settings' to at least 10 seconds.
  • Under 'Designer', click 'API Gateway' to add it to the Lambda function
    • Below, under 'Configure triggers', choose 'Create a new API'
    • Name it anything you like
    • Enter anything you like for 'Deployment stage'
    • For 'Security' - choose 'Open'
    • Click 'add'
    • Click 'Save'
    • Under the details of the API Gateway, copy the value of "Invoke URL" somewhere
  • Click on the Function box again to configure the function
  • Configure the following Environment Variables:
Environment Variable How to get the value
BUNQ_API_TOKEN From the bunq app - you need to Allow All IP-Addresses
BUNQ_PRIVATE_KEY openssl genrsa -out private_key.pem 2048 && cat private_key.pem | base64
LAMBDA_CALLBACK_URL The "Invoke URL" value you copied from the API Gateway
YNAB_ACCESS_TOKEN From nYnab, account settings, Developer section
  • At "Handler", type: list_user.lambda_handler
  • Click the "Test" button
    • In the 'Configure Test Event' box, choose any event name and click 'Create'
    • Click 'Test' again
  • Copy the output of the test call somewhere
  • Configure the remaining environment variables:
Environment Variable How to get the value
BUNQ_INSTALLATION_TOKEN From the output of the test above - without the single quotes
BUNQ_SERVER_PUBLIC_KEY From the output of the test above - without the single quotes
BUNQ_USER_ID From the output of the test above (line beginning with UserPerson)
  • At "Handler", type: list_budget.lambda_handler
  • Click 'Save'
  • Click the "Test" button
  • Copy the output of the test call somewhere
  • Configure the last environment variables:
Environment Variable How to get the value
YNAB_BUDGET_ID Choose the GUID of the budget you want to use

Registering the callback handler at bunq

  • At "Handler", type: auto_sync.add_callback
  • Click 'Save'
  • Click the "Test" button

Setting up the automatic syncing

  • At "Handler", type: auto_sync.sync
  • Click 'Save'
  • Click the "Test" button


Previously, you needed to set BUNQ_ACCOUNT_ID and YNAB_ACCOUNT_ID to specify which bunq account you wanted to monitor and to which YNAB account those transactions should be imported into. This is still possible, however, the default behaviour now is to sync all bunq accounts and look up corresponding YNAB budgets with exactly the same name. Transactions will be imported there. If a corresponding YNAB account is not found, this is logged.

Known issues

When doing the first sync, some duplicate transactions may be imported with the wrong date.

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