XF 2.2 Adding a user upgrade with code

[Edman]

I have Xenforo integrated with my site, and I need to add user upgrades from my site's admin CP.

I know how to find a user, and I know how to find an upgrade

$user = \XF::em()->find('XF:User', $userid);
$upgrade = \XF::em()->find('XF:UserUpgrade', 2);

But how do you add the upgrade to the user?

EDIT: nevermind, after more searching found this thread

XF 2.1 - XF Framework - User Upgrades/Downgrades

Hello, I'm currently coding an external page with PHP and I need to be able to upgrade/downgrade users through the XF framework. Unfortunarely I can't find any references for user upgrade/downgrades. Can someone share some code for User upgrades/downgrades through the XF framework? :) Currenty...

xenforo.com

solves everything!