Optionalm.new_Optionalmsc4354_The sticky key as per MSC4354. Must be equal to the event ID of the notification being declined.
Optional because servers without MSC4354 support can't deliver the decline as a sticky event. Such a decline still counts, but only for devices that receive it directly, since it isn't re-delivered after a gappy or initial sync.
MSC4310 decline event content for
org.matrix.msc4310.rtc.decline. Sent as a standard m.reference relation to anorg.matrix.msc4075.rtc.notificationevent.