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Upgrading recipes are a specific type of station recipes. They allow any player to upgrade a specific items, using ingredients. These recipes do also support recipe conditions and other recipe options like hide-when-lockedcrafting stations

Upgrading Recipe Example

recipes:
    steel-sword-upgrade:
        item:
            type: SWORD
            id: STEEL_SWORD
        conditions:
        - 'level{level=5}'
        ingredients:
        - 'mmoitem{type=MATERIAL,id=STEEL_INGOT,amount=4}'

This upgrade recipe allows players to upgrade the item named Steel Sword. This type of recipes do NOT support crafting time, therefore they must all be instant, as if you used a consumable. In order to use this recipe, the player must be at least level 5, and must have 4 steel ingots in his inventory.
Of course, the player must also have one of these Steel Swords when using the recipe, otherwise he will be prompted an error message.