add-on service; optional service
A wasei-eigo term for a service offered as an extra, often for an additional fee, such as a premium feature or subscription add-on.
wasei-eigo (Japanese-coined English), from option service
If you subscribe to this app's add-on service, ads will be hidden.
I added priority boarding as an optional service to my flight ticket.
Variant with a middle dot; less common in everyday writing.
Wasei-eigo (Japanese-made English) from 'option' + 'service'. It is wasei.