How to find my currency value in a server script?

I'm doing a script wich sets up a function for a remote event. However, my remote event is supposed to subtract cash, and I'm using a server script, so I can't use LocalPlayer to find my player. Here is my script that will use fire the event:

script.Parent.MouseButton1Down:Connect(function()
    
    if game.Workspace.Purchasedbmw.Value == 1 then
        -- Spawn it
        game.ReplicatedStorage.SpawnCar:FireServer(script.Parent.Parent.Name)
    else

        -- Let them purchase it    
        local PriceOfItem = 1000
        
        if game.Players.LocalPlayer.leaderstats.Cash.Value >= PriceOfItem and game.Workspace.Purchasedbmw.Value == 0 then
            -- The player has enough cash
            game.ReplicatedStorage.RemoteEvent:FireServer() -- This will fire the event (I still don't know what to put in the brackets, I just copied what is on the fifth line)
            game.Workspace.Purchasedbmw.Value = 1
			print("Value changed successfully!")
            script.Parent.Text = "Spawn"
            script.Parent.MouseButton1Down:connect(function()
            -- Deletes the car.
                for i,v in pairs(game.Workspace:GetChildren()) do
                    if v.Name == game.Players.LocalPlayer.Name.."'s bmw" or v.Name == game.Players.LocalPlayer.Name.."'s mc" or v.Name == game.Players.LocalPlayer.Name.."'s por" or v.Name == game.Players.LocalPlayer.Name.."'s s13" or v.Name == game.Players.LocalPlayer.Name.."'s hoon" or v.Name == game.Players.LocalPlayer.Name.."'s gtr" then
                        v:Destroy()
                   
                end end
            end)

        end
    end
end) 

And this is the script that sets up the event function:

game.Players.PlayerAdded:Connect(function(localplayer)
	local leaderstats = localplayer:WaitForChild("leaderstats")
	local cash = leaderstats:WaitForChild("Cash")
	local priceofitem = 1000
	game.ReplicatedStorage.RemoteEvent.OnServerEvent:Connect(function(player)-- Sets function
		cash.Value = cash.Value - priceofitem
	end)
end)

I've tried using the playeradded event to define player, but it doesn't seem to be working.

#Problems

##IMPORTANT This script is Exploitable, Rememeber This ONE rule. Basic Server Side Validation. A clever hacker may just Fire the remote event to Spawn the car, You ALWAYS want to check stuff ON THE SERVER

That being said lets fix this script:

1. On line 5 you added this Parameter to the FireServer call script.Parent.Parent.Name but the Server never used that Parameter and I don't know what it is.

#Solutions

1. Check if you have Enough currency ON THE SERVER
2. I don't think you need extra paramaters to spawn a car (Unless you do, Maybe you want to pass in a specific Model)

#Final Scripts LocalScript:

script.Parent.MouseButton1Down:Connect(function()
	-- Use SERVER-SIDE VALIDATION
	
	 game.ReplicatedStorage.SpawnCar:FireServer(script.Parent.Parent.Name)

          script.Parent.Text = "Spawn"
          script.Parent.MouseButton1Down:connect(function()
          -- Deletes the car.
	  -- Idk what this is. so.....
                for i,v in pairs(game.Workspace:GetChildren()) do
                    if v.Name == game.Players.LocalPlayer.Name.."'s bmw" or v.Name == game.Players.LocalPlayer.Name.."'s mc" or v.Name == game.Players.LocalPlayer.Name.."'s por" or v.Name == game.Players.LocalPlayer.Name.."'s s13" or v.Name == game.Players.LocalPlayer.Name.."'s hoon" or v.Name == game.Players.LocalPlayer.Name.."'s gtr" then
                        v:Destroy()

                end end
            end)

        end
    end
end) 

Server Script:

local function SpawnCar(player)
	local leaderstats = player.leaderstats
	local cash = leaderstats.cash
	local priceOfItem = 1000

	if cash.Value >= 1000 and game.Workspace.Purchasedbmw == 0 then -- Checks if player has enough Money, if so Buys the car
		cash.Value = cash.Value - priceOfItem
		game.Workspace.Purchasedbmw.Value = 1
	end
end

game.ReplicatedStorage.SpawnCar.OnServerEvent(SpawnCar)

Alright, I figured it out. I initially wanted to change game.Workspace.Purchasedbmw.Value to 1, in a way that the server detects it changed. So I was trying to get the whole script in a remote event, but everything I needed to do is to only make the event change the value. This is the script that defines the function.

game.ReplicatedStorage.ChangeValue.OnServerEvent:Connect(function(player)
	game.Workspace.Purchasedbmw.Value = 1
end)

This is the script that will fire the event.

script.Parent.MouseButton1Down:Connect(function()
    
    if game.Workspace.Purchasedbmw.Value == 1 then
        -- Spawn it
        game.ReplicatedStorage.SpawnCar:FireServer(script.Parent.Parent.Name)
    else

        -- Let them purchase it    
        local PriceOfItem = 1000
        
        if game.Players.LocalPlayer.leaderstats.Cash.Value >= PriceOfItem and game.Workspace.Purchasedbmw.Value == 0 then
            -- The player has enough cash
            game.ReplicatedStorage.ChangeValue:FireServer()-- This fires the event that changes value.
			print("Value changed successfully!")
            script.Parent.Text = "Spawn"
            script.Parent.MouseButton1Down:connect(function()
            -- Deletes the car.
                for i,v in pairs(game.Workspace:GetChildren()) do
                    if v.Name == game.Players.LocalPlayer.Name.."'s bmw" or v.Name == game.Players.LocalPlayer.Name.."'s mc" or v.Name == game.Players.LocalPlayer.Name.."'s por" or v.Name == game.Players.LocalPlayer.Name.."'s s13" or v.Name == game.Players.LocalPlayer.Name.."'s hoon" or v.Name == game.Players.LocalPlayer.Name.."'s gtr" then
                        v:Destroy()
                   
                end end
            end)

        end
    end
end) 

If you were trying to do the same thing, here is the answer.