Very basic custom RESTful API to check the membership level of a Paid Memberships Pro User

my_init_pmpro_mini_api.php

/*
	Call to http://yoursite.com/?verify=email@domain.com&secret=SOMESECRETHERE to check the membership level of a user.
*/
function my_init_pmpro_mini_api()
{
	if(function_exists('pmpro_getMembershipLevelForUser') && 
		!empty($_REQUEST['verify']) && 
		!empty($_REQUEST['secret']))
	{
		if($_REQUEST['secret'] != "SOMESECRETHERE")
			wp_die("Invalid secret.");
			
		$user = get_user_by("email", str_replace(" ", "+", ($_REQUEST['verify'])));
		if(empty($user))
			wp_die("User not found.");
			
		$membership_level = pmpro_getMembershipLevelForUser();
		if(empty($membership_level))
			die("0");
			
		//user and membership level found, output json encoded membership level info
		echo json_encode($membership_level);		
	
		exit;
	}
}
add_action('init', 'my_init_pmpro_mini_api');

Hi, I think https://gist.github.com/strangerstudios/9f8c0bc82cb02e127afc#file-my_init_pmpro_mini_api-php-L17 should be:

$membership_level = pmpro_getMembershipLevelForUser($user->ID);