make shop item appear when item is grab

[summer yarrow]

as the title say i want to make that when we take a certain Key item is make appear some weapon in a shop i set already the flags is shoplineuparam and create the item key but for the part of scripting i'm completely lost

[odd crescent]

If you have set the flag for the Item pickup in ItemLot then there is no need to script anything, flags referenced in ItemLot are set on whenever they are awarded.

As long as the flag in ItemLotParam references the flag in ShopLineupParam then it should be unlocked.