请教一下 这是什么API接口，在哪里可以申请或者获取

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<?php
if(!defined('IN_DISCUZ')) {
exit('Access Denied');
}

class table_index_restriction extends discuz_table
{
public function __construct()
{
parent::__construct();

    $this->_pk = 'id';
    $this->_table = 'plugin_lingke_license_restriction';
}

var $city = array(
    'Beijing'=>'北京',
    'Tianjin'=>'天津',
    'Shijiazhuang'=>'石家庄',
    'Xingtai'=>'邢台',
    'Handan'=>'邯郸',
    'Baoding'=>'保定',
    'Cangzhou'=>'沧州',
    'Langfang'=>'廊坊',
    'Tangshan'=>'唐山',
    'Qinhuangdao'=>'秦皇岛',
    'Zhengzhou'=>'郑州',
    'Hangzhou'=>'杭州',
    'Nanchang'=>'南昌',
    'Guiyang'=>'贵阳',
    'Chengdu'=>'成都',
    'Xian'=>'西安',
    'Lanzhou'=>'兰州',
);

/**
 * 一周记录
 *
 * @access public
 * @param string, int, int, string
 * @return array
 */
public function restriction_week_list($city, $monday)
{
    $min_time = $monday;
    $max_time = $min_time + 86400 * 6;

    $sql = 'SELECT * FROM %t WHERE city=%s AND day>=%d AND day<=%d ORDER BY id ASC';

    return DB::fetch_all($sql, array($this->_table, $city, $min_time, $max_time));
}

public function city_key_get($city)
{
    $city_key = '';
    if(! $city){
        return $city_key;
    }
    
    foreach($this->city as $key =>$value){
        if(strpos($city, $value) !== FALSE){
            $city_key = $key;
            break;
        }
    }
    
    return $city_key;
}

public function traffic_restriction_get($city, $date)
{
    $date = date('Ymd', $date);
    $where = '{"Date":"'.$date.'"}';
    $url = 'https://9y7h7igs.api.lncld.net/1.1/classes/'.$city.'?where='.$where;

    $headers = array(
        'X-LC-Id: ',
        'X-LC-Key: ',
        'Content-Type：application/json',
    );
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    $result = curl_exec($ch);
    $errno = curl_errno($ch);
    curl_close($ch);
    if($errno) {
        return lib_base::back_array('网络错误');
    }
    
    $result = json_decode($result, true);

    if(! $result['results'][0]){
        return lib_base::back_array('网络错误');
    }
    
    $data = array(
        'date'=>$result['results'][0]['Date'],
        'number'=>($result['results'][0]['TailNumber'] && $result['results'][0]['TailNumber'] != 'none') ? $result['results'][0]['TailNumber'] : '',
    );
    
    return lib_base::back_array($data, 0);
}

}