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[0] in function chmod in /var/www/hopeinstoughton_www/wp-content/plugins/simple-universal-google-analytics/main.php on line 8
[1] in function include_once in /var/www/hopeinstoughton_www/wp-settings.php on line 560
[2] in function require_once in /var/www/hopeinstoughton_www/wp-config.php on line 85
[3] in function require_once in /var/www/hopeinstoughton_www/wp-load.php on line 50
[4] in function require_once in /var/www/hopeinstoughton_www/wp-blog-header.php on line 13
[5] in function require in /var/www/hopeinstoughton_www/index.php on line 17

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

//YOUR ACCOUNT NUMBER (6 characters)
$accNumber = '******';
//UPS API Credentials (obtain after APP creation)
$clientId = '***YOUR_UPS_API_CLIENT_ID***';
$password = '***YOUR_UPS_API_PASSWORD***';

$config = \UPS\OAuthClientCredentials\Configuration::getDefaultConfiguration()
    ->setUsername($clientId)
    ->setPassword($password);

$apiInstance = new \UPS\OAuthClientCredentials\Request\DefaultApi(
// If you want use custom http client, pass your client which implements `GuzzleHttp\ClientInterface`.
// This is optional, `GuzzleHttp\Client` will be used as default.
    new \GuzzleHttp\Client(),
    $config
);
$grant_type = "client_credentials"; // string |
$x_merchant_id = $accNumber; // string | Client merchant ID

try {
    $result = $apiInstance->createToken($grant_type, $x_merchant_id);
    print_r($result);
} catch (Exception $e) {
    echo 'Exception when calling DefaultApi->generateToken: ', $e->getMessage(), PHP_EOL;
}