mengambil securetoken googleapis

<?php


function newuser($key){
  $url="https://www.googleapis.com/identitytoolkit/v3/relyingparty/signupNewUser?key=$key";
  $h[]="Content-Type: application/json";
  $h[]="User-Agent: Mozilla 5.0 (Linux; U; Android 7.0; in_ID; Redmi Note 4; Build/NRD90M); com.google.android.gms/203019021; FastParser/1.1; ApiaryHttpClient/1.0; (gzip) (mido NRD90M); gzip";
  $h[]="Host: www.googleapis.com";
  $ch=curl_init();
  curl_setopt_array($ch, array(
    CURLOPT_URL => $url,
    CURLOPT_RETURNTRANSFER => TRUE,
    CURLOPT_FOLLOWLOCATION => TRUE,
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_HTTPHEADER => $h,
    CURLOPT_SSL_VERIFYPEER => 0,
    CURLOPT_COOKIEJAR => "OYA",
    CURLOPT_COOKIEFILE => "OYA",
    CURLOPT_COOKIESESSION => TRUE,
    CURLOPT_ENCODING => "gzip",
    ));
    return curl_exec($ch);
    curl_close($ch);
}

function token($key,$post){
  $url="https://securetoken.googleapis.com/v1/token?key=$key";
  $h[]="Content-Type: application/x-www-form-urlencoded";
  $h[]="User-Agent: Mozilla 5.0 (Linux; U; Android 7.0; in_ID; Redmi Note 4; Build/NRD90M); com.google.android.gms/203019021; FastParser/1.1; ApiaryHttpClient/1.0; (gzip) (mido NRD90M); gzip";
  $h[]="Host: securetoken.googleapis.com";
  $ch=curl_init();
  curl_setopt_array($ch, array(
    CURLOPT_URL => $url,
    CURLOPT_RETURNTRANSFER => TRUE,
    CURLOPT_FOLLOWLOCATION => TRUE,
    CURLOPT_CUSTOMREQUEST => "POST",
    CURLOPT_HTTPHEADER => $h,
    CURLOPT_SSL_VERIFYPEER => 0,
    CURLOPT_POSTFIELDS => $post,
    CURLOPT_COOKIEJAR => "OYA",
    CURLOPT_COOKIEFILE => "OYA",
    CURLOPT_COOKIESESSION => TRUE,
    #CURLOPT_ENCODING => "gzip",
    ));
    return curl_exec($ch);
    curl_close($ch);
}


$key="AIzaSyARAeW-k03xDLTl0oLOTMd0Nwby3r9Tq8Y";
$new=json_decode(newuser($key),true);
$data="grant_type=refresh_token&refresh_token=".$new['refreshToken'];
$scret=json_decode(token($key,$data));
print_r($scret);