In numerous software/web programs, including TiddlyWiki5, I have seen advanced "Save to Github" features. These features generally need use of username, repository, and password/PAT, and save changes to the actual file to the Github Repository. I would like to implement this feature in one of my programs, but have been unable to find documentation/information on how to do this, namely overriding file code and replacing it with the changed code.
Do any of you happen to know?