How to add/remove addon to/from owned license

First, you need to get a list of active addons via this call. 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. 
Note: Only QualityUnit support can change addon status. Reseller can change an only valid-to date.
If a reseller wants to re-activate feature again for some license - he just needs to set validity date for the future.
How to add new addon to license
Note: If you add paid extension to some license, addon price will be distracted from your reseller account balance.