With this plugin you have the possibility to synchronise the Inventory and Enderchest of Players among multiple Spigot servers via a MySQL Database. The config.yml looks like this:

mysql:
host: "127.0.0.1"
database: "player_inventories"
user: "root"
password: ""

messages:
sync_start: "Synchronising Inventory..."
sync_success: "Sucessfully synchronised your Inventory!"
sync_failed: "Synchronisation failed! Please contact Administrators of this Server."

If you find any bugs feel free to leave a review.