I used Godot 4.4 for the game and there is a plugin called SilentWolf, it was really easy to implement (took me around 3 hours).
Making a simple online leaderboard in Godot with SilentWolf : https://escada-games.itch.io/jump3match/devlog/242610/making-a-simple-online-lea...
SilentWolf : https://silentwolf.com/