Due to some technical hurdles, affiliates do not earn commissions on mobile app paid upgrades, only if people they refer purchase a standard Pro, Star or Legend license.
However, if you refer someone to TubeBuddy.com and they are on a mobile device, the user is encouraged to click a button on our side to send a "reminder email" and remind them to install the TubeBuddy browser extension. When the user clicks this button, they are first required to log into our website. During the log-in process, the use is forever tied to your affiliate code and no matter when they upgrade to a regular paid TubeBuddy license in the future, you will receive credit for the sale.