`treepuncher` supports both legacy Yggdrasil authentication (with options to override session and auth server) and modern Microsoft OAuth authentication. It will store the auth token inside a session file, to restart without requiring credentials again
to be able to use Microsoft authentication you will need to register an Azure application (see [community](https://wiki.vg/Microsoft_Authentication_Scheme) and [microsoft](https://learn.microsoft.com/en-us/entra/identity-platform/quickstart-register-app) docs on how to do that).
this is a tedious process but can be done just once for many accounts, sadly Microsoft decided that only kids play minecraft and we developers should just suffer...
once you have your `client_id` and `client_secret` use [this page](https://fantabos.co/msauth) to generate a login code: put in your `client_id` and any state and press `auth`.
you will be brought to Microsoft login page, input your credentials, authorize your application and you will be redirected back to the `msauth` page, but now there should be a code in the `auth code` field
if you'd rather use classic Yggdrasil authentication, consider [ftbsc yggdrasil](https://yggdrasil.fantabos.co) ([src](https://git.fantabos.co/yggdrasil))
development is managed by [ftbsc](https://fantabos.co), mostly on [our git](https://git.fantabos.co). If you'd like to contribute, get in contact with any of us using any available form