Magento & Hubspot - Submitting Form on Success Page - php

Question

I'm trying to submit a form to Hubspot on the success page of Magento. I confirmed already that the variable $str_post contains all of the info that's needed. Unfortunately, I can't determine why $response is empty. It seems like the CURL connection is not being made but I can't seem to determine why. Is there something I need to do to trigger the CURL connection other than just loading the page?
Please note I've removed the GUI/Form ID from the URL.
<?php
//Process a new form submission in HubSpot in order to create a new Contact.
$hubspotutk = $_COOKIE['hubspotutk']; //grab the cookie from the visitors browser.
$ip_addr = $_SERVER['REMOTE_ADDR']; //IP address too.
$hs_context = array(
'hutk' => $hubspotutk,
'ipAddress' => $ip_addr,
'pageUrl' => 'https://www.myfoodstorage.com/onestepcheckout/',
'pageTitle' => 'MyFoodStorage.com Cart Checkout'
);
$hs_context_json = json_encode($hs_context);
//Need to populate these varilables with values from the form.
$str_post = "firstname=" . urlencode($firstname)
. "&lastname=" . urlencode($lastname)
. "&email=" . urlencode($email)
. "&phone=" . urlencode($telephone)
. "&address=" . urlencode($street)
. "&city=" . urlencode($city)
. "&state=" . urlencode($region)
. "&country=" . urlencode($country)
. "&hs_context=" . urlencode($hs_context_json); //Leave this one be :)
//replace the values in this URL with your portal ID and your form GUID
$endpoint = 'https://forms.hubspot.com/uploads/form/v2/GUI-ID/FORM-ID';
$ch = #curl_init();
#curl_setopt($ch, CURLOPT_POST, true);
#curl_setopt($ch, CURLOPT_POSTFIELDS, $str_post);
#curl_setopt($ch, CURLOPT_URL, $endpoint);
#curl_setopt($ch, CURLOPT_HTTPHEADER, array('application/x-www-form-urlencoded'));
#curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = #curl_exec($ch); //Log the response from HubSpot as needed.
#curl_close($ch);
echo $response;
?>

Answer 1

A successful submission to the Forms API will return a 204 (No Content) response, so there would be nothing in the body of the response. You can get the status code using curl_getinfo.
$response = #curl_exec($ch); //Log the response from HubSpot as needed.
echo #curl_getinfo($ch, CURLINFO_HTTP_CODE);
#curl_close($ch);
echo $response;