Android：错误“错配发件人ID”,同时通过PHP和GCM将通知推送到Android设备

我正试图通过我的.PHP页面向我的手机发送通知…
一切都设置正确,但我收到错误：

{"multicast_id":7751536172966571167,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"MismatchSenderId"}]}

我不知道为什么因为发件人ID是对的,api也是(我已经尝试过服务器密钥和浏览器密钥,只是为了确定).

我真的不知道我哪里错了！

在我的应用程序中我只有发件人ID,所有都已经正确,在我的服务器中我已经获得了浏览器的密钥(现在)：

<>PHP require_once("../pi_classes/commonSetTing.PHP");
include('../pi_classes/User.PHP');
ini_set("display_errors",1);
class GCM{
    function __construct(){}
    public function send_notification($registatoin_ids,$messagE){
        // Google Api KEY
        define("GOOGLE_API_KEY","xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
        $url="https://android.googleapis.com/gcm/send";
        $fields=array(
            "registration_ids"=>$registatoin_ids,"data"=>$message,);
        var_dump($fields);
        $headers=array(
            "Authorization: key=".GOOGLE_API_KEY,"Content-Type: application/json"
        );
        $ch=curl_init();
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_POST,truE);
        curl_setopt($ch,CURLOPT_httpHEADER,$headers);
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,CURLOPT_SSL_VERIFYPEER,falsE);
        curl_setopt($ch,CURLOPT_POSTFIELDS,json_encode($fields));
        $result=curl_exec($ch);
        if($result===falSE){
            die("Curl Failed: ".curl_error($ch));
        }
        curl_close($ch);
        echo $result;
    }
}
// ======================
//=INVIA LE NOTIFICHE AGLI UTENTI =
// ======================
$messaggio="Ciao,sono una notifica!";
$pushCounter=0;
$registatoin_ids=array();
$result=MysqL_query("SELECT android_regi_id FROM user_details");
while($row=MysqL_fetch_array($result)){
    $token=$row["android_regi_id"];
    if($token!=""){
        $registatoin_ids[]=$token;
        $pushCounter++;
    }
}
if($pushCounter>0){
    $gcm=new GCM();
    $message=array("price"=>$messaggio);
    $result_android=$gcm->send_notification($registatoin_ids,$messagE);
    echo $result_android;
}