Try this. Just add the items to the table.
local items = {
['demon armor'] = {itemid = 2494, count = 1, payment = "money", payment_id = 0, price = 300000},
['mastermind shield'] = {itemid = 2514, count = 1, payment = "item", payment_id = 2520, price = 2}
}
local items_list = {}
for...