Php 在云消息选项卡中找不到lagacy服务器密钥？

我正在尝试生成推送通知以响应本机android应用程序

我提到

我使用下面的代码通过php生成推送通知。并得到下面提到的错误

我在云消息选项卡中找不到lagacy服务器密钥，所以我在代码中放置了服务器密钥而不是lagacy服务器密钥。 也无法理解传递给类型的内容。 我现在如何解决它

public function fcm(){
        define( 'API_ACCESS_KEY', '');
        $registrationIds = array('db7z_kIQRgyktn...-a4LW:APA91bEtK_.....');
        
        $msg = array
            ( 
                'title'         => "Test",
                'body'       => "testing",
                'summaryText'   => 'The internet is built on cat pictures',
                'click_action'  => 'FCM_PLUGIN_ACTIVITY',
                'vibrate'       => 1,
                'sound'         => 1,
                'type'          => $this->type
            );
     
        $fields = array
        (
            'registration_ids'  => $registrationIds,
            'notification'              => $msg
           
        );
         
        $headers = array
        (
            'Authorization: key=' . API_ACCESS_KEY,
            'Content-Type: application/json'
        );
         
        $ch = curl_init();
        curl_setopt( $ch,CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send' );
        curl_setopt( $ch,CURLOPT_POST, true );
        curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
        curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
        curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
        curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );
        $result = curl_exec($ch );
        curl_close( $ch );
        echo $result;
    }

错误

{
    "multicast_id": 1006474377365535027,
    "success": 0,
    "failure": 1,
    "canonical_ids": 0,
    "results": [
        {
            "error": "MismatchSenderId"
        }
    ]
}