how do i make process receipt work?

This is what i have on a server script. I have an error on line 3

local marketserv = game:GetService("MarketplaceService")

marketserv.ProccessReceipt:connect(function(purchaseinfo)
	local plr1 = game.Players:GetPlayerByUserId(purchaseinfo.PlayerId)
	local cash = plr1.leaderstats.Cash
		if purchaseinfo.ProductId == 270172519 then
			cash.Value = cash.Value + 100
		end
	
end)

Don't use :connect (or :Connect) for this, also you didn't set a return value!

local marketserv = game:GetService("MarketplaceService")

function marketserv.ProccessReceipt(purchaseinfo)
    local plr1 = game.Players:GetPlayerByUserId(purchaseinfo.PlayerId)
    local cash = plr1.leaderstats.Cash
        if purchaseinfo.ProductId == 270172519 then
            cash.Value = cash.Value + 100
	return Enum.ProductPurchaseDecision.PurchaseGranted	--> Any code after this won't run, unless the code doesn't get runned.	
        end
end