ESX Scripts for FiveM

That long history is the thing to plan around. An ESX server usually mixes resources written across several versions of es_extended, so identifier handling, money accounts and item names are rarely identical between any two servers. Whatever you add has to fit your build rather than the other way round.

Legacy and the older ESX branches also differ in how they expose the player object and register callbacks. Checking which one a resource targets before you install it saves the usual afternoon of chasing nil values through the server console.