How to add/remove addon to/from owned license
First, you need to get a list of active addons via this call (https://support.qualityunit.com/701321-How-to-get-list-of-addons-on-owned-license). Now you have to decide which addon you want to remove/disable. You can address each addon using _addon license_ code. In this example, we'll try to disable one plugin changing its status to refunded:
After receiving "200 - OK" successful answer you're done. If you set addon validity to past, the customer won't be able to use it anymore.