EasyPost\User::api_keys PHP Метод

    public function api_keys($apiKey = null)
    {
        $api_keys = self::all_api_keys();
        $my_api_keys = null;
        if ($api_keys->id == $this->id) {
            $my_api_keys = $api_keys->keys;
        }
        if (is_null($my_api_keys)) {
            foreach ($api_keys->children as $children_keys) {
                if ($children_keys->id == $this->id) {
                    $my_api_keys = $children_keys->keys;
                }
            }
        }
        if (is_null($my_api_keys)) {
            return null;
        } else {
            $response = array();
            foreach ($my_api_keys as $key) {
                $response[$key->mode] = $key->key;
            }
            return $response;
        }
    }