$msg = array(
    'id_carrera'=>$this->id_carrera,
    'tokenUsuario'=>$tokenCl,

    'reason'=>'nuevaCarrera',
    'title' =>'Nueva Carrera',
    'body'      => 'Click para detalles',
    'icon'=>'taxi_icon',
    'color' => '#009688',
    'click_action'=>'OPEN_ACTIVITY_1',
    'sound'=>'default',
    'vibrate'=>'default'
);
$data = array(
    'id_carrera'=>$this->id_carrera,
    'tokenUsuario'=>$tokenCl,

    'title' =>'Nueva Carrera',
    'body'      => 'Click para detalles',
    'icon'=>'taxi_icon',
    'reason'=>'nuevaCarrera',
    'id_carrera'=>$this->id_carrera
);
$fields = array (
    'to'    => $this->token,
    'notification' => $msg,
    'data' => $data
);

$api = "AIzaSyDt-izN3mBijzYKS5eBSjkZ4vUBjTBGsd8";

$headers = array ('Authorization: key='.$api, '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_SSL_VERIFYHOST, 0);
curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch,CURLOPT_TIMEOUT, 1); //timeout in seconds
curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );



$result = curl_exec($ch );

if($result === false) {
    echo 'Curl error: ' . curl_error($ch);
}

curl_close( $ch );