Here's the discussion on the Id's
The IDs are neither completely random and are of variable length
https://gist.github.com/fnky/76f533366f75cf75802c8052b577e2a5
There’s a project called typeid which implements an ID scheme similar to Stripe.<p><a href="https://github.com/jetify-com/typeid">https://github.com/jetify-com/typeid</a>