Activates a campaign for one device or user. You must provide a deviceId and/or a userId. If deviceId is provided, the campaign top-level actions will be sent to the corresponding device only; if only userId is provided, the campaign top-level actions will be sent to all devices of the user with specified userId. If the user/device does not exist, sending the actions will be skipped. You can modify this behavior with the createDisposition option (see below).
This method requires your development API clientKey.