fz-survival-datapack/data/fz/advancements/game_event/on_villager_trade.json

{
    "parent": "fz:game_event",
    "criteria": {
        "on_villager_trade": {
            "trigger": "minecraft:villager_trade"
        }
    },
    "rewards": {
        "function": "fz:game_event/player/on_villager_trade"
    }
}