I need help with MarketplaceService.ProcessReceipt

Help and Feedback Scripting Support
#1

Today, I tried making a simple one-time developer product that you buy and use, repeatable.
So, I have tried to use MarketplaceService.PromptPurchaseFinished, but it didn’t work.
Then, I realized that I had to use MarketplaceService.ProcessReceipt.
I tried using that, but no matter what I tried, it didn’t work and I couldn’t understand it, so I have been banging my head against the closest wall ever since.

So, could any of you fine people please explain this to me? I would be very thankful if you could.

#2

It would be helpful if you posted your code so that we can look at why it’s not working. Make sure you include additional information about your code. Is it a Script or a LocalScript?

There is a help article on using PromptPurchaseFinished. I would recommend you check it out and see if it helps you.

#3

PromptPurchaseFinished does not work on developer products.
Not only that, but my code is completely rubbish. I could not even figure how to use ProcessReceipt.

#4

But, well… That’s what im stuck on :confused::

game.ReplicatedStorage.Events.Prompt.OnServerEvent:Connect(function(plr, id)
	
	mPS:PromptProductPurchase(plr, id)
	
	--check if the player has bought the product and give the product to the player if he did.
end)
#5

This article goes in detail about how to handle developer product purchases made and give them the product. It even provides a code example. I suggest you check it out and see if it helps you with your issue.

Note that this article is different from the other one I posted above.

#6

I have read that. Im ashamed to admit that it seems too advanced for me though.
Or rather, for my brain to understand. Thats why I created this post.

#7

You need a ProcessReceipt callback. This will handle any purchases made in your game. DataStore is used to record that a player completed a transaction and that the game does not accidentally duplicate what they bought. I added some comments to the code from the help article so that you could understand it.

local MarketplaceService = game:GetService("MarketplaceService")
local DataStoreService = game:GetService("DataStoreService")
local Players = game:GetService("Players")
 
-- Data store for tracking purchases that were successfully processed
local purchaseHistoryStore = DataStoreService:GetDataStore("PurchaseHistory")
 
-- Table setup containing product IDs and functions for handling purchases
local productFunctions = {}

productFunctions[123123] = function(receipt, player) -- Replace 123123 to your ProductId. 
	-- Write the code to give them what they bought.
	return true -- Keep this to show that you gave the product to the player.
end

-- You can copy and paste the code above for each product you make.

-- The core 'ProcessReceipt' callback function
local function processReceipt(receiptInfo)
 
	-- Determine if the product was already granted by checking the data store  
	local playerProductKey = receiptInfo.PlayerId .. "_" .. receiptInfo.PurchaseId
	local purchased = false
	local success, errorMessage = pcall(function()
		purchased = purchaseHistoryStore:GetAsync(playerProductKey)
	end)
	-- If purchase was recorded, the product was already granted
	if success and purchased then
		return Enum.ProductPurchaseDecision.PurchaseGranted
	elseif not success then
		error("Data store error:" .. errorMessage)
	end
 
	-- Find the player who made the purchase in the server
	local player = Players:GetPlayerByUserId(receiptInfo.PlayerId)
	if not player then
		-- The player probably left the game
		-- If they come back, the callback will be called again
		return Enum.ProductPurchaseDecision.NotProcessedYet
	end
	
	-- Look up handler function from 'productFunctions' table above
	local handler = productFunctions[receiptInfo.ProductId]
 
	-- Call the handler function and catch any errors
	local success, result = pcall(handler, receiptInfo, player)
	if not success or not result then
		warn("Error occurred while processing a product purchase")
		print("\nProductId:", receiptInfo.ProductId)
		print("\nPlayer:", player)
		return Enum.ProductPurchaseDecision.NotProcessedYet
	end
 
	-- Record transaction in data store so it isn't granted again
	local success, errorMessage = pcall(function()
		purchaseHistoryStore:SetAsync(playerProductKey, true)
	end)
	if not success then
		error("Cannot save purchase data: " .. errorMessage)
	end
 
	-- IMPORTANT: Tell Roblox that the game successfully handled the purchase
	return Enum.ProductPurchaseDecision.PurchaseGranted
end
 
-- Set the callback; this can only be done once by one script on the server! 
MarketplaceService.ProcessReceipt = processReceipt
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#8

Honestly, I think I might’ve done it.

1 Like