user upgrade affiliate

Hello community, I am looking for an add-on for my xenforo page. I'd like to implement an affiliate system for my users. I would like to do it without any additional store addon, only via the built in xenforo upgrades feature. My goal is it, to give users a % commission of the upgrade price the...

Anyone running an affiliate program for user upgrades? If so, what are you using? Not finding any out of the box options really. Wanted to see what others are using before having something custom built. Thanks.