I'm making a cross server economy plugin that uses mysql. I am using UUIDs to store the amount of cubes (my currency) each player has. It was all working, then I realized I can't change or view the value of a player when their offline, because I was doing this by "String uuid = player.getUniqueId()" and this doesn't work for offline players. I have changed all the parameters of the functions to accept strings, and then changed the strings into offline players within each function, but I do not know how to get the UUID of a Bukkit.getOfflinePlayer. Would anyone be able to tell me how this is done?