Mailbox is a crosswalk server module that automatically saves and loads player data for you.
It is designed to avoid a centralized data module with all the game information of a player. Instead, each server modules can register their own data.
Mailbox is easy to use, it has a really minimal API. Find the functions available to use in the API reference page.
This documentation is work in progress, if you have found typos or if you have any suggestion on what could be added, open a issue on Gitlab.