These are examples on how to use the Zulip API.
See https://zulip.com/api/rest for Zulip API docs.
See https://www.youtube.com/watch?v=BhMy68sa8mg for more details.
They are provided on an as-is basis. You will typically need to read the small programs line-by-line just to make sure you are comfortable with what they are doing, and then you will typically change a few lines to say which streams and/or topics you want to send messages to.