How to use developer products in Roblox (ProcessReceipt that never double-grants)

Updated 2026-10-17 · Roblox and game developers · by CyberMax

Copy-paste code

ServerScriptService/Purchases.server.lua

Copylocal MarketplaceService = game:GetService("MarketplaceService")
local DataStoreService = game:GetService("DataStoreService")
local Players = game:GetService("Players")
local receipts = DataStoreService:GetDataStore("Receipts_v1")

local GRANTS = {
	[123456789] = function(player) -- your developer product id
		player.leaderstats.Coins.Value += 500
		return true
	end,
}

MarketplaceService.ProcessReceipt = function(info)
	local player = Players:GetPlayerByUserId(info.PlayerId)
	local grant = GRANTS[info.ProductId]
	if not player or not grant then
		return Enum.ProductPurchaseDecision.NotProcessedYet
	end
	local granted = false
	local ok = pcall(receipts.UpdateAsync, receipts, info.PlayerId .. "_" .. info.PurchaseId, function(already)
		if already then granted = true return nil end -- granted on an earlier call
		if not grant(player) then return nil end
		granted = true
		return true
	end)
	if ok and granted then
		return Enum.ProductPurchaseDecision.PurchaseGranted
	end
	return Enum.ProductPurchaseDecision.NotProcessedYet
end

-- client: MarketplaceService:PromptProductPurchase(player, 123456789)

Good to know

ProcessReceipt can be called again for the same purchase, for example after a server crash or when the player rejoins. The PurchaseId record is what stops a second grant.

Only one script may set ProcessReceipt. Put every product in that one GRANTS table.

Roblox checks Listed products' ProcessReceipt and stops showing a product outside your game if it detects a problem.

Studwright: Roblox systems that never lose saves

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Studwright's Receipts module grants developer products exactly once and saves the grant with the player's session-locked data. 16 tested modules in one kit.

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