Access to organization field within the API

Hi all,

I have been trying to access a custom field I made for the Organization from the API, and could not figure out from the documentation how to access those fields, since they are not part of the Data Model.

I tried to do a "getSystemSettings" to see if it could be there, and encountered following error:

{
"errorCode": "Internal",
"message": "An internal error has occurred, the error was logged and will be examined.",
"referenceId": "3D9aZFhmHY3TO0u4jSdMDa"
}

While making a GET request to following URL:  

https://apie.clarizentb.com/v2.0/services/metadata/getSystemSettingsValues?Settings="SessionTimeout","PasswordComplexity"

With my valid session id as an authorization header.

Any advice?

Thank you,

Noémie