Automate refresh of Spotify access_token

I would like to automate the renewal of the Spotify access_token by using the refresh_token obtained upon authenticating a host user's account. As of currently, the default expiry time for an access_token occurs 1 hour after retrieval.

[Refreshing tokens using Spotify's API](https://developer.spotify.com/documentation/web-api/tutorials/refreshing-tokens)
