Hey so i made a developer product and i made a script so that when a player touches a part, they are prompted with a dev product purchase (500 coins) but there seems to be an issue at line 52 where it says it attempted to call a nil value.
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[1226666863] = function(receipt, player)
-- Logic/code for player buying 100 gold (may vary)
local stats = player:FindFirstChild("leaderstats")
local coins = stats and stats:FindFirstChild("Coins")
if coins then
coins.Value = coins.Value + 500
-- Indicate a successful purchase
return true
end
end
-- 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
Would the script work if i called it in a different way without needing a receipt. I just want to make a script where if the player buys the dev product, the player gets 500 coins
I am just trying to think why that error would happen since things seem to able to work correctly in theory. It’s acting as if the table that has the function is nil, or if pcall itself is nil, which is very strange.
Maybe it has to do with the fact that processReceipt shouldn’t really yield and the pcall is causing issues for it, but im not sure.
And yea I do realize this is how the example is shown on the developer hub. Might need to do a work around instead of fixing the error itself.
I’m guessing this is a template script, you likely need to change the developer product ID to one of your own (the one which you intend to award 500 coins).
Hey so i fixed it, 1226666863 was indeed my own ID. I have another issue, the purchase goes fine but the players are not awarded 500 Coins, it’s a serverscript with a click detector under the part (fivehundred)
local MarketPlaceService = game:GetService("MarketplaceService")
game.Players.PlayerAdded:Connect(function(player)
local leaderstats = player:WaitForChild("leaderstats")
end)
MarketPlaceService.PromptPurchaseFinished:Connect(function(userId,assetId,wasPurchased)
if wasPurchased then
print("Purchase Finished.")
if game.Players:GetPlayerByUserId(userId) == nil then
return Enum.ProductPurchaseDecision.NotProcessedYet
elseif game.Players:GetPlayerByUserId(userId) ~= nil then
game.Players:GetPlayerByUserId(userId).leaderstats.Coins.Value += 500
end
return Enum.ProductPurchaseDecision.PurchaseGranted
end
end)
local purchasePart = game.Workspace:WaitForChild("fivehundred")
purchasePart.ClickDetector.MouseClick:Connect(function(player)
print("i clicked")
MarketPlaceService:PromptProductPurchase(player,1228116898)
end)
local MPS = game:GetService("MarketplaceService")
local Players = game:GetService("Players")
local devProductId = 1228116898
local purchasePart = workspace:WaitForChild("fivehundred")
local clickDetect = purchasePart:WaitForChild("ClickDetector")
clickDetect.MouseClick:Connect(function(player)
MPS:PromptProductPurchase(player, devProductId)
end)
MPS.PromptProductPurchaseFinished:Connect(function(userId, productId, isPurchased)
if isPurchased then
local Player = Players:GetPlayerByUserId(userId)
if Player then
if productId == devProductId then
Player.leaderstats.Coins.Value += 500
return Enum.ProductPurchaseDecision.PurchaseGranted
--[[elseif productId == 0 then
Player.leaderstats.Coins.Value += 1000
return Enum.ProductPurchaseDecision.PurchaseGranted--]]
end
elseif not Player then
return Enum.ProductPurchaseDecision.NotProcessedYet
end
end
end)
The bit I’ve commented out would be how you could add more developer products.
