Developer chat and what is and is not shutting down? #356

Greetings. While working with a client I noticed a string mentioning that something was being shut down in regards to Square. I setup Square API version 2 I think it was about 2-3 years ago. What if anything in regards to that is being shut down?

Additionally there used to be a chat room, like Slack or something (not entire sure) and I can't find it. The website for the documentation is completely broken and the pass word field to sign in is plain text (and the form is a total mess).