Commissions based on subscriptions

Hello,

Can you tell me where commissions are set and what I need to do to customize the plugin to accept different commissions based on subscription?

There are various options for commissions, based on product for example, but not based on subscription.

I will have 3 different subscriptions and need to have different commissions set automatically, instead of manually fixing commissions for each user.

Can you help me to achieve this?