I started working on one for NodeJS recently.
Currently I’ve got the login flow with API keys automated including persistent storage of the generated public/private key pair and basic information needed for the login flow.
Automated request signing is available already with plans to implement response validation soon. After that encryption of the data storage files is necessary to guarantee safety.
And then I need to figure out a way to automatically generate code for the API that bunq provides as it’s quite extensive and keeping up without automatic generation isn’t easy.