I can't spot what's wrong with this php file. Can someone help. I've spent an hour looking at other solutions and I'm sure I've got the 's paired correctly
PHP 7.3.19-1~deb10u1 (cli) (built: Jul 5 2020 06:46:45) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.3.19, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.3.19-1~deb10u1, Copyright (c) 1999-2018, by Zend Technologies
Debian 10
#!/usr/bin/php
<?php
$ch = curl_init();
$header = array(
'Content-type: application/vnd.api+json',
'Accept: application/vnd.api+json',
);
$postStr = json_encode(array(
'grant_type' => 'client_credentials',
'client_id' => 'client_id',
'client_secret' => 'client_secret',
));
$url = 'https://example.com/Api/access_token';
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_POSTFIELDS, $postStr);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
$output = curl_exec($ch);
?>