OKTA API Call with PHP Curl

okta_curl.php

/**********************************
     Function for OKTA REST API CALL  
***********************************/
   
    function Okta ($url, $method = "GET", $data = "") {
       
        $apiKey = "your key";
        $baseUrl = "https://dev-123456.oktapreview.com";

        $headers = array(
            'Authorization: SSWS ' . $apiKey,
            'Accept: application/json',
            'Content-Type: application/json'      
        );

        $curl_url = $baseUrl. $url;

        $curl = curl_init();

        curl_setopt($curl, CURLOPT_URL, $curl_url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_HEADER, 0);
        curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
       
        if ($method == "POST") {      
            curl_setopt($curl, CURLOPT_POST, 1);
        }      
       
        if ($method == "GET") {      
            curl_setopt($curl, CURLOPT_HTTPGET, 1);
        }
       
        if (!empty($data)) {          
            //curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
            //curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($data));                    
            curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));

        }
               
        //$output = curl_exec($curl);

        if (($output = curl_exec($curl)) === FALSE) {
            die("Curl Failed: " . curl_error($curl));
        }
       
        //curl_getinfo($curl);
       
        curl_close($curl);
        return json_decode($output);
    }


//Sample call:

$data = array(
        'username' => 'johndoe',
        'password' => 'sanfrancisco'      
    );

$result = Okta ("/api/v1/authn", "POST", $data);

print_r($result);