REST-ful connection utilizing cURL header issues - php

Question

I've spent hours troubleshooting this utilizing PHP documentation, the API documentation, as well as other posts on stackoverflow, and am finally asking for help.
I am attempting to write an interface utilizing the new pbSmartConnections API: API Documentation
I have been having challenges with both fsockopen and cURL, however I seem to be able to get farther in the process utilizing cURL, so that's what I'm presenting here. Here's the challenge:
Per my understanding of the documentation, I should be passing the ApiKey as part of the header. When I do this, regardless of the different ways I've attempted to structure the code, I ALWAYS receive the following response:
{
"ErrorCode": 10,
"Message": "Unauthorized"
}
I'm hoping a fellow SO member can see something in my code below (please offer any criticisms and/or suggestions, too!):
(NOTE: The API key below IS valid. It's connected to an account with nothing of value in it, so feel free to use it in your testing)
<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://rest.pbsyscontrol.com/v1/Ping");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type"=>"application/json", "Accept"=>"application/json", "ApiKey"=>"41460b3f-8f35-4878-b78d-49ca7f29c071"));
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_HTTPGET, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($ch);
$http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
?>
In case you are wondering, while I would like this to work as part of the header, I HAVE tried passing it as a part of the URL as well:
<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://rest.pbsyscontrol.com/v1/Ping?ApiKey=41460b3f-8f35-4878-b78d-49ca7f29c071");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type"=>"application/json", "Accept"=>"application/json", "ApiKey"=>"41460b3f-8f35-4878-b78d-49ca7f29c071"));
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_HTTPGET, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($ch);
$http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
?>

Answer 1

The PHP documentation says:
An array of HTTP header fields to set, in the format array('Content-type: text/plain', 'Content-length: 100')
You thus want to use the following line instead of the original:
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json", "Accept: application/json", "ApiKey: 41460b3f-8f35-4878-b78d-49ca7f29c071"));
This does not however, solve the problem that the ApiKey probably isn't valid.

Answer 2

I finally heard back from support, and what they indicated was that I was using the incorrect url (although at this time, it IS the url in their API Documentation)
The URL in the API documentation was their STAGING, not PRODUCTION. Amazing what switching the URL to the correct one that they sent in their reply - rest.api.pbsmartconnections.com does for the connection. That one change and everything began working properly.
THANK YOU all who took a look, and to #mvdnes for the recommendations on how to set headers.