How to access developer products through datastore?

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1 
-- 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
    print(playerProductKey)
    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

Hello I am a not well-versed in DataStores and I’ve used the roblox default callback function for saving player’s developer products to the datastore local purchaseHistoryStore = DataStoreService:GetDataStore("TestingPurchases").

The issue is that the playerProductKey prints out a strange key, for e.g: 4787929_20493853823728d3a7 instead of 4787929_532453432.

The second one would be what I need it to say when I’m checking if the player already has the developer product.

To check for the developer product I’m using a for-loop to iterate through a dictionary of productIds like so:

for _, value in pairs(ProductID.PremiumBuildings) do

		local playerProductKey = player.UserId .. "_" .. value

		local purchased = purchaseHistoryStore:GetAsync(playerProductKey)

		if purchased then
			print(player.Name.." has "..value)
		end
end

Am I checking the playerProductKey incorrectly?

Any help would be great, thank you!

2

So first off, the PurchaseId is not your AssetId, which is why it looks funky.

Second, there is no way to re-access a purchase DataStore key, because the PurchaseId is uniquely generated. So no, you aren’t checking the PlayerProductKey correctly, because there is no way to check it.

3

Ah that makes sense why its so funky. So there’s no way to determine if a player has purchased a developer product?

4

It’s possible, there’s a useful resource at the developer hub which demonstrates how.

5

A developer product is supposed to be bought multiple times. If you want to know whenever a player has purchased a developer product before, instead of iterating through the transactions, you can save it permanently in a different data store, like using true or false.