Retrieve user id of inserted member via API

	//Init our modx manager
	$modx->initialize('mgr');

	// Fetch user group first
	$group = $modx->getObject('modUserGroup',array('name'=>'Clients'));

	// Create User
	$user = $modx->newObject('modUser', array('username' => $modxData['username']));
	$user->set('password', md5($modxData['password']));
	
	//Create Users Profile
	$profile = $modx->newObject('modUserProfile');
	$profile->set('fullname', $modxData['firstName'] . ' ' . $modxData['lastName']);
	$profile->set('email', $modxData['email']);
	$profile->set('address', $modxData['address'] . ' ' . $modxData['county'] . ' ' . $modxData['postcode']);
	$profile->set('phone', $modxData['contactNumber']);
	
	//Add profile to user
	$user->addOne($profile);

	// Set the role
	$role = $modx->getObject('modUserGroupRole', array('name'=>'Member', 'authority'=>'9999'));

	// Add the user to the group with the role above
	$intersect = $modx->newObject('modUserGroupMember');
	$intersect->addOne($user);
	$intersect->addOne($group);
	$intersect->addOne($role);
	$modx->beginTransaction();

	if (! $intersect->save()) {
		$modx->rollback();
		return header('HTTP/1.1 406 Error - Something went wrong whilst trying to add you into MODx');
	} else {
		$modx->commit();

		//user id of inserted member please!
	}

$user=$modx->getObject('modUser',array('username'=>$modxData['username']));
echo $user->get('id');

...
$modx->commit();
$user->getPrimaryKey();