edit code PHP

I want to pass variable to static JSON

<?php
require_once('../send/vendor/autoload.php');

$client = new \GuzzleHttp\Client();



$hos="shadoooo";



$response = $client->request('POST', 'https://XXX.COM/api/v1/sendTemplateMessage?whatsappNumber=96655XXXXX',
[
'body' => '{"parameters":
[{"name":"name1","value":"hosam"},
{"name":"discount_code","value":"gh5"},
{"name":"shop_name","value":"shadow"}],
"template_name":"aband_cart4",
"broadcast_name":"test01"}',

'headers' => [
'Authorization' => 'Bearer KLKLKLK
]);

echo $response->getBody();