As the administrator (server owner) you can get commissions on purchases made by your customers via My.Plesk.com service: domain registration, renewal, transfers, purchases of SSL certificates and third-party tools or services. To do this, you need to create a My.Plesk.com account and register your server (Plesk instance) with it. After that you will be able to track the purchases made by your customers via MPC and earn commissions. You can register multiple servers with a single My.Plesk.com account.
To enable/disable access to the My.plesk.com services from the control panel, follow these steps:
On the Server administration page click
Add Services. The Additional Services
Setup page appears: 
Select (or deselect) the checkbox corresponding to the service you wish to activate (or deactivate).
Click OK to submit changes.
To register your server with MPC, follow these steps:
Click
Register. The MPC Login page will open in a new browser
window.Enter your Login name and Password in the fields provided, click Log In to enter. You will be taken to the page My Commissions, and prompted to register your server.
Click the button Register Server Now. The Server Registration page will open displaying your Plesk software license key number and your IP address.
Click OK to confirm your server registration.