View Sub-Processor List
In the Channel Partner portal, go to Management > User Management > Users and click Edit next to the User you want to view. In User Details, you will see the information associated with that user.
Click Sub-processors at the bottom of the page.
This will bring up a viewable list of sub-processors:
Enable Sub-Processor List Change Notifications
To enable Sub-Processor List notifications, select the Notifications tab on the left-hand menu.
Check Notify me when the sub-processor list changes.