$payload = '{
  "client_id": "'.OAUTH2_CLIENT_ID.'",
  "client_secret": "'.OAUTH2_CLIENT_SECRET.'",
  "grant_type": "authorization_code",
  "code": "'.$code.'",
  "redirect_url": "'.$redirect.'",
  "scope": "identify guilds"
}';

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $token_url);
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode(json_decode($payload)));
$api_ruser = curl_exec($curl);