Guzzle 401 response sending data by post about oauth-subscriber HOT 6 OPEN

<?php

use GuzzleHttp\Subscriber\Oauth\Oauth1;
use GuzzleHttp\Client;
use GuzzleHttp\HandlerStack;

require_once 'vendor/autoload.php';


$stack = HandlerStack::create();

$middleware = new Oauth1([
    'consumer_key'    => 'xxxxxxxxxxx',
    'consumer_secret' => 'xxxxxxxxxxxxx',
    'token'           => 'xxxxxxxxxxxx',
    'token_secret'    => 'xxxxxxxxxxx',
    'signature_method' => Oauth1::SIGNATURE_METHOD_HMACSHA256,
]);
$stack->push($middleware);

$client = new Client([
    'base_uri' => 'http://wildcountrygear.in/',
    'handler' => $stack,
    'auth' => 'oauth'
]);

$options = [
    'json' => [
        'username' => 'xxxxxxxxxxx',
        'password' => 'xxxxxxxxxxx'
    
    ]
];

// Now you don't need to add the auth parameter
$res = $client->post('http://wildcountrygear.in/rest/default/V1/integration/admin/token',$options);
echo $res->getBody();