public function getApiParamStructure($child_params_structure = null)
 {
     if ($child_params_structure != null) {
         $params_structure = $child_params_structure + $this->api_params_structure__method;
     } else {
         $params_structure = $this->api_params_structure__method;
     }
     return parent::getApiParamStructure($params_structure);
 }