Commissions may refer to 2 things:
1. In the game, when convincing the $landlady of the Art Blog (SpankBank), it is said/implied that the protagonist will take commissions from basically OnlyFans subscribers for the $landlady to perform. Those are not implemented yet (they lost two polls so far, iirc)
2. In the MOM community, a backer (10$/€ +) is entitled to participate in a sort of monthly raffle to win a commission for a scene in the game.
Given the changelog, I believe you are referencing the second type.
EDIT:
A third option is to just contact me for a paid commission.