Endpoint:
GET /server/config

Headers:
Content-Type: application/json
Authentication: Bearer %access_token%

Authentication:
Grant_type: client_credentials
Scopes: []

Response body:
{
  "appName": string,
  "type": "central",
  "version": string,
  "locale": {
    "lang": string,
    "currency": string,
    "currencyPrecision": 0
  },
  "network": {
    "hostname": string
  },
  "accounting": {
    "mode": 0
  },
  "credit": {
    "enabled": true
  },
  "cards": {
    "validity": 0
  },
  "pins": {
    "changeEnabled": true,
    "minLenght": 0
  },
  "security": {
    "password": {
      "minLength": 0,
      "complexity": 0
    },
    "lockout": {
      "attempts": 0,
      "time": 0
    }
  }
}
CODE

Note that the %access_token% needs to be replaced by the token you received as a response from auth endpoint.

JSON of basic configuration and enabled features of server are returned in the response.