For example, you refer customer A to install an app at $29.99 for Basic plan. After a 14-day free trial, if A continues to use the app, with your commission rate of 30%, you will then receive $29.99*30% = $8.997. Next month, If A upgrades to a higher plan (e.g: $34.99), your commission will increase at $34.99*30% = $10.497.