Anybody using n8n with qonto in 2025? Oauth2 fails

Questions
1

I read most post regarding Qonto about years ago. I saw that other users leverage the n8n generic Oauth2 Credential node.
I’m able to interrogate my qonto via Basic Auth API, but to run transfers Oauth2 is a must.
I’m getting this error:

https://app.qonto.com/404?error=invalid_client&error_description=Client+authentication+failed+%28e.g.%2C+unknown+client%2C+no+client+authentication+included%2C+or+unsupported+authentication+method%29.+The+requested+OAuth+2.0+Client+does+not+exist.

I’m running n8n 1.115.3 via npm over Debian 12 LXC container

Thanks

2

I resolved it by contacting Qonto developers support. The subscription as Qonto developer is mandatory, the API reference is not clear on this point.

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