Vero PHP client is using cURL on top on our Rest API. Here's how to use it:
require_once('PATH/TO/FILE/vero.php');
$v = new Vero("YOUR_AUTH_TOKEN");
$v->identify("1234567890", "[email protected]", array('First name' => 'Jeff', 'Last name' => 'Kane'));
$v->update("1234567890", array('First name' => 'Jack', 'Last name' => 'Wollo', 'job_title' => 'Developer'));
$v->tags('1234567890', array('Blog reader'), array());
$v->track("Subscribe to service", array('id' => '1234567890'), array('Plan name' => 'XL Plan', 'Price' => 149));
$v->unsubscribe("1234567890");