set_my_volume: Set the volume for the user’s current playback device.
In tinyspotifyr: Tinyverse R Wrapper for the 'Spotify' Web API

Set the volume for the user’s current playback device.

set_my_volume(
  volume_percent,
  device_id = NULL,
  authorization = get_spotify_authorization_code()
)

`volume_percent`	Required. Integer. The volume to set. Must be a value from 0 to 100 inclusive.
`device_id`	Optional. The id of the device this command is targeting. If not supplied, the user’s currently active device is the target.
`authorization`	Required. A valid access token from the Spotify Accounts service. See the Web API authorization Guide for more details. Defaults to `spotifyr::get_spotify_access_token()`. The access token must have been issued on behalf of the current user. The access token must have the `user-modify-playback-state` scope authorized in order to control playback.