Developer Product Script doesn't work?

So, In this case I have a screen GUI with a frame and a text button. You buy the developer product in game, and it gives you money for the game. I've been getting complaints that people are not receiving the money. I used it and it works perfectly fine and in the output theres no errors.

productId = 22952120 
amnt = 1000
local MarketplaceService = game:GetService("MarketplaceService")
function UsernameFromID(ID)
    if type(ID) ~= "number" then
    return
    end
    local sets = game:service("InsertService"):GetUserSets(ID)
    for k, v in next, sets do
        if v.Name == "My Models" then
            return v.CreatorName
        end
    end
end
function giveRewards(player)
            local thisplr = script.Parent.Parent.Parent.Parent.Parent
                local stats = thisplr:findFirstChild("leaderstats")
            if (stats~=nil) then
                local score = stats:findFirstChild("Money")
                if (score~=nil) then
                    score.Value = score.Value + amnt
    return Enum.ProductPurcaseDecision.PurchaseGranted
                end
            end
            end

script.Parent.MouseButton1Down:connect(function()
    game:GetService("MarketplaceService"):PromptProductPurchase(script.Parent.Parent.Parent.Parent.Parent, productId)
end)