PHP CURL Orchestrator Workflow Execution

I'm trying to get a workflow to run using PHP/CURL and all I get in response is a blank browser screen and no workflow execution in orchestrator.

The workflow ID here is a standard out of the box workflow under vcenter/Batch/Fill batch configuration elements. I chose this one because I just wanted a test case that required no parameters and then move onto something more complicated.

Can someone point out what I am doing incorrectly? Also, if I could ask - would someone be able to provide the change I would make to include 1 or 2 parameters?

Any help is appreciated.

Thank you,

Gillon

<?php       $url = 'https://1.2.3.4:8281/vco/api/Workflows/36808080808080808080808080808080A1808080012233687034703cc9494706e/executions';        $curlOptions = array(CURLOPT_URL  => $url,            CURLOPT_CUSTOMREQUEST => "GET",            CURLOPT_HTTPAUTH => CURLAUTH_BASIC,            CURLOPT_SSLVERSION => 3,            CURLOPT_SSL_VERIFYPEER => 0,            CURLOPT_SSL_VERIFYHOST => 0,            CURLOPT_USERPWD => "username:password",            CURLOPT_RETURNTRANSFER => true,            CURLOPT_HEADER => true,            CURLOPT_HTTPHEADER => array('Contecnt-Type: application/xml')        );        curl_setopt_array($curl, $curlOptions + $this->curlOptDefaults);        $content = curl_exec($curl);        if(curl_errno($curl) != 0)        {            echo "Error CURL : " . curl_error($curl);            die('');        }        $tabWorkFlows = json_decode($content, true);
?>