Sync name and level to Mailchimp with PMPro and PMPro Mailchimp

my_pmpro_mailchimp_listsubscribe_fields.php

/*
	Sync fields to MailChimp
	
	Add this to a custom plugin or your active theme's functions.php file.
	
	Make sure to add a "LEVEL" text merge field on the Mailchimp side.
*/
function my_pmpro_mailchimp_listsubscribe_fields($fields, $user)
{
	if(!function_exists('pmpro_getMembershipLevelForUser'))
		return;
	
	$level = pmpro_getMembershipLevelForUser($user->ID);
	if(!empty($level))
		$level_name = $level->name;
	else
		$level_name = "None";

	$new_fields =  array(
      "FNAME" => $user->first_name, 
      "LNAME" => $user->last_name,
	  "LEVEL" => $level_name,
	);

	$fields = array_merge($fields, $new_fields);
	  
	return $fields;
}
add_action('pmpro_mailchimp_listsubscribe_fields', 'my_pmpro_mailchimp_listsubscribe_fields', 10, 2);