code: private function isValidOperation($operationType)
      {
          $operationType = strtoupper($operationType);
  
          return in_array(
              $operationType,
              [
                  ActionTypes::CREATE,
                  ActionTypes::UPDATE,
                  ActionTypes::DELETE,
              ]
          );
      }
docs: Validates operation type.
  
  @param string $operationType
  
  @return bool