Details about expiring credit are available here:https://help.market.envato.com/hc/en-us/articles/202821380-Why-do-Pre-Paid-Credits-Expire-
I wrote an early blog post on the topic Styleguide Driven Development
I just read that again and must have missed the point that this style guide uses real views just with fake data.
This is incredible! Not just a bunch of HTML mockups that some UI team put together for the developers to copy.