Custom hook to unsubscribe customer from MailChimp

[5iveleaf]

I've got this working as a standalone PHP file, but for some reason when I set it up as a custom hook in WHMCS, it no longer works. Here is the content of my hook_mailchimp_unsubscribe.php file which I've placed in /includes/hooks.

 

I thought perhaps it didn't like the email variable, but I've tried hard-coding this with a known email addresses as well which also didn't work. Any ideas what I might be doing wrong here? X's are obviously for obfuscation of actual MailChimp account information.

 

add_hook('AfterShoppingCartCheckout', 1, function ($vars) {
// email variable from WHMCS
   //$email = $vars['clientdetails']['email'];

// Mailchimp call to unsubscribe user based on email
$user  		= 'XXXXXXX';
   $apiKey 	= 'XXXXXXX-us12';
$auth		= base64_encode( 'user:' . $apiKey);
   $listId 	= 'XXXXXXXXXX';
   $memberId 	= md5(strtolower($email));
   $dataCenter = substr($apiKey,strpos($apiKey,'-')+1);
   $url 		= 'https://' . $dataCenter . '.api.mailchimp.com/3.0/lists/' . $listId . '/members/' .$memberId;

   $json = json_encode(
   	array(
        'status'        => 'unsubscribed' // "subscribed","unsubscribed","cleaned","pending"
	)
);

   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_USERAGENT, 'PHP-MCAPI/3.0');
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
   curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
   curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PATCH');
   curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json','Authorization: Basic '.$auth));

   $result = curl_exec($ch);
   $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
   curl_close($ch);

return $httpCode;

});

 

- - - Updated - - -

 

Oh, and in my actual code the

$email = $vars['clientdetails']['email'];

is not commented out.

 

- - - Updated - - -

 

I've also tried setting the priority to 2 in case there was a conflict of hooks. No dice there either.

[5iveleaf]

Also tried using the ClientAdd hook instead of AfterShoppingCartCheckout along with

$email = $vars['email'];

Still not working. Is there an issue with running JSON calls within custom hooks? I should probably also mention we're running v 5.3.14 (I know, ancient).