How to add masks to Pointshop?

Hi! I wanted to add the “Payday 2 Masks” to my Pointshop in Garry’s Mod.
But I do not know where I should put the pointshop lua file. Does it go in “headshatsmasks” or “accessories”. I think it should go to headshatmasks but I dunno how to make the pointshop.lua file.
Because for example the Snowman Head’s code is like this:

ITEM.Name = 'Snowman Head'
ITEM.Price = 200
ITEM.Model = 'models/props/cs_office/Snowman_face.mdl'
ITEM.Attachment = 'eyes'

function ITEM:OnEquip(ply, modifications)

function ITEM:OnHolster(ply)

function ITEM:ModifyClientsideModel(ply, model, pos, ang)
	pos = pos + (ang:Forward() * -2.2)
	ang:RotateAroundAxis(ang:Up(), -90)
	return model, pos, ang

function ITEM:CanPlayerBuy(ply)
	return"%m") == "12" and true or false, 'It\'s not winter!'

I tried this… But it just gave me lua errors when I tried to join the server. (I removed the Winter thingy btw). Can anyone help me?

it goes in what ever category you want to put it in. did you add the files to the fastdl as well as the server files?

it would also help if you posted the errors