code: def link_auth_data!(service_name, **data)
        response = client.set_service_auth_data(id, service_name, data)
        raise Parse::Client::ResponseError, response if response.error?
        apply_attributes!(response.result)
      end
docs: Adds the third-party authentication data to for a given service.
   @param service_name [Symbol] The name of the service (ex. :facebook)
   @param data [Hash] The body of the OAuth data. Dependent on each service.
   @raise [Parse::Client::ResponseError] If user was not successfully linked