Migrate to new Spotify-API-Changes

[alexshadowolex]

According to this Blog, Spotify is changing a lot to their API.

This is supposed to go live on March 9th and will change Endpoints, Fields and more. There is probably a lot in this repository that needs to be migrated or even removed.

I only searched for a quick example: In the File ClientPlaylistApi.kt on line 144, the function addPlayablesToClientPlaylist calls the endpoint playlists/<id>/tracks. In this article it is noted as a renamed endpoint:

• [REMOVED] Add Items to Playlist (POST /playlists/{id}/tracks) – Adds tracks or episodes to a playlist.
  • Use POST /playlists/{id}/items instead
• [ADDED] Add Items to Playlist (POST /playlists/{id}/items) – Add one or more items to a user's playlist.

This was just an example, there is a lot more that changed and needs to be checked.

Further reading:

• Initial Blog: https://developer.spotify.com/blog/2026-02-06-update-on-developer-access-and-platform-security
• Web API Changelog: https://developer.spotify.com/documentation/web-api/references/changes/february-2026
• Migration Guide: https://developer.spotify.com/documentation/web-api/tutorials/february-2026-migration-guide

[redslime]

see #344

[alexshadowolex]

Thanks for sharing your progress on the migration. I was also thinking about helping a little bit, but you were faster :) Appreciate your efforts, hope the Tests go through and PR-Review finishes in time. Cheers Mate!