How do I make a levelup system using ScriptApi?

[jovial girder]

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[solar iris]

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[scenic ravine]

@jovial girder check out my addon LOTR Craft. I literally just did this for the most recent update. check the scripts folder in behavior pack

it basically sets all of the objectives, and after certain events, modifies the XP and the level by running a quick calculation formula

[jovial girder]

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[fathom basalt]

Don’t use objectives, use DynamicProperties

[nimble grove]

            var gained_xp = 0
            //If killing a player, get a portion of their XP
            if (event.hurtEntity.typeId == "minecraft:player"){
                gained_xp = entity_functions.get_entity_objective_score(event.hurtEntity, "command_level")
                gained_xp *= 8.2
            }
            else{
                gained_xp = entity_functions.get_entity_objective_score(event.hurtEntity, "command_points")
            }
            var gain_side = data_convert.FactionSIDEINVERT(entity_functions.get_entity_objective_score(event.hurtEntity, "chosen_faction"))
            var damager_side = data_convert.FactionSIDE(entity_functions.get_entity_objective_score(event.damagingEntity, "chosen_faction"))
            
            if (damager_side == gain_side || entity_functions.get_entity_objective_score(event.hurtEntity, "chosen_faction") == 88){
                //server_main.world.say("giving XP")
                //DIRECT TO PLAYER
                if (event.damagingEntity.typeId == "minecraft:player"){//give player xp for killing entity
                    commander_controller.modify_commanderXP(event.damagingEntity, gained_xp)
                }
                //A TAMED ENTITY KILLS IT
                else if (entity_functions.check_valid_score(event.damagingEntity, "player_host")){
                    gained_xp *= 0.7
                    var playerHost = entity_functions.get_playerBy_ID(entity_functions.get_entity_objective_score(event.damagingEntity, "player_host"))            
                    commander_controller.modify_commanderXP(playerHost, Math.round(Number(gained_xp)))
                }
            }
        }```
This I assume?

[scenic ravine]

yes that script is for events that add the xp. The actual function is the commander_controller.modify_commanderXP

[scenic ravine]

stil pretty new to script API, so im not 100% sure how to use them yet