Problem Authenticating with REST API and SSO

Thanks for the information in this thread it got me all the info I needed to get this working in my PHP script.

I used the base snippet from the OP, but customized it to work with my needs.

I have incorporated SimpleXMLElement to handle the outputted XML response.

As you can see, I have stored the Status of the response in a local variable as well as the returned session key value.

Both of which, I intend to use in logical checks in my script's error checking and subsequent REST API calls, respectively.

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<?php
	
	// Sets the external IP of the Server making the REST API calls
	$external_ip_address = '<your_external_ip(i.e.., xxx.xxx.xxx.xxx)>';
	
	// Secret SSO key (128-bit or 256-bit) provided by Lithium
	$sso_key = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";

	// Initialize Lithium SSO Client
	require_once("lithium_sso.php");

	$lithium = new lithium_sso("<your company>", "<.your_company.com>", $sso_key);

	// (Optional) Additional user profile settings to pass to Lithium
	$settings_array = array();

	$settings_array["roles.grant"] = "Administrator";

	// Create the authentication token
	$liToken = $lithium->get_auth_token_value("<your_unique_id>", "<your_admin_username>", "<your_admin_email_address>", $settings_array, $lithium->get_server_var("HTTP_USER_AGENT"), $lithium->get_server_var("HTTP_REFERER"), $external_ip_address);

	$post_data="sso.authentication_token=$liToken";

	$process = curl_init();                                                                      
	 curl_setopt($process, CURLOPT_URL, 'http://<your_community>/<your_company>/restapi/vc/authentication/sessions/login');                       
	 curl_setopt($process, CURLOPT_TIMEOUT, 30);                                                   
	 curl_setopt($process, CURLOPT_POST, 1);                                                              
	 curl_setopt($process, CURLOPT_POSTFIELDS, $post_data);                              
	 curl_setopt($process, CURLOPT_RETURNTRANSFER, TRUE);                              
	 
         $return = curl_exec($process);  

         curl_close($process);

	$response = new SimpleXMLElement($return);
	echo 'response = ' . $response['status'];
	echo '<br>key = ' . $response->value;
	
?>