code: def update(self, request, *args, **kwargs):
          
          return super(ServiceSettingsViewSet, self).update(request, *args, **kwargs)
docs: To update service settings, issue a **PUT** or **PATCH** to */api/service-settings/<uuid>/* as a customer owner.
          You are allowed to change name and credentials only.
  
          Example of a request:
  
          .. code-block:: http
  
              PATCH /api/service-settings/9079705c17d64e6aa0af2e619b0e0702/ HTTP/1.1
              Content-Type: application/json
              Accept: application/json
              Authorization: Token c84d653b9ec92c6cbac41c706593e66f567a7fa4
              Host: example.com
  
              {
                  "username": "admin",
                  "password": "new_secret"
              }