Application to download playlists from Spotify using Flutter. Made specifically for Android, could work for iOS with a couple changes.
If you don't know how to get the client_id and client_secret, you must do the following:
1. Browse to https://developer.spotify.com/dashboard/applications.
2. Log in with your Spotify account.
3. Click on ‘Create an app’.
4. Pick an ‘App name’ and ‘App description’ of your choice and mark the checkboxes.
After creation, you see your ‘Client Id’ and you can click on ‘Show client secret` to unhide your ’Client secret’.