I use Prepared Serial numbers for the downloading products. But there is one problem, I cannot understand whether I have not absolutely correctly adjusted a script or such is not provided in it. For example if the buyer could not finish successfully payment that to me it is necessary to establish the goods status as Cancelled. But thus serial number is not released from the status the used. In that case if I had 10 items that some buyers cannot receive serial number if other buyers had not paid goods. Prompt as it is possible to solve this problem? Thanks