How do you get process receipt to do what the developer product does?

I can't figure out what I should do to make the developer product table work

[1] = function(receipt, player)
	if player.Character and player.Character:FindFirstChild("Humanoid") then
		player.Character.Humanoid.Health = 0
		-- Indicate a successful purchase
		return true
	end
end
}


MarketplaceService.ProcessReceipt = function(ReceiptInformation)
		
	local player = Players:GetPlayerByUserId(ReceiptInformation.PlayerId)
	if not player then
		return Enum.ProductPurchaseDecision.NotProcessedYet
	end
	
	
	local handler = productFunctions[ReceiptInformation.ProductId]


	return Enum.ProductPurchaseDecision.PurchaseGranted
	
end

Is there like a function to trigger one of the developer products?

I have no idea how

This should help you out: https://www.youtube.com/watch?v=h92s4Xn26oc