Using The Origin Account System In Your Project - Mistium/Origin-OS GitHub Wiki

This system allows you to integrate your system into the origin server system to fetch and authorise origin accounts

If you use Turbowarp :) https://github.com/Mistium/Origin-OS/blob/main/VersionsSource/Systems/originClientv1.sb3

If you use Penguinmod :( https://github.com/Mistium/Origin-OS/blob/main/VersionsSource/Systems/originClientv1.pmp