Why doesnt my devproduct work? It wont updated leaderstats.

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local MS = game:GetService("MarketplaceService")
local Players = game:GetService("Players")

local function processRecipt (receiptInfo)
    local plr = Players:GetPlayerByUserId(receiptInfo.PlayerId)
    if not plr then
        return Enum.ProductPurchaseDecision.NotProcessedYet
    end
    if plr then
        print(receiptInfo.CurrencySpent)
        print(receiptInfo.CurrencySpent)
        game.Players:GetPlayerByUserId(receiptInfo.PlayerId):FindFirstChild("leaderstats").Donation.Value = game.Players:GetPlayerByUserId(receiptInfo.PlayerId):FindFirstChild("leaderstats").Donation.Value + receiptInfo.CurrencySpent  
    end
    return Enum.ProductPurchaseDecision.PurchaseGranted
end

MS.ProcessReceipt = processRecipt()