A Python script that fetches a Spotify playlist and searches on https://beatsaver.com for the songs + downloads them if found
Install required packages:
pip install requests spotipy
Create a new app on https://developers.spotify.com/ and copy client ID and client secret in the file spotify_beatsaver.py in line 44 and 45
Search for a playlist on Spotify (e.g. https://open.spotify.com/playlist/37i9dQZF1DX7ZUug1ANKRP) and get the ID of this playlist (e.g. 37i9dQZF1DX7ZUug1ANKRP). Insert this ID in line 49.
Set the path for custom songs in BeatSaber in line 8.
Run the script
python3 spotify_beatsaver.py