serkankaya

Hi All, I have a product that I need to invoice to the customer based on daily usage and quantity. For example, in a month the user can consume it only one day or can consume whole month. The user may consume additional products; can use them for a few days and then can cancel again. The usage and quantity reports are fetched from another resource. I need to invoice the customer manually each month with varying amounts depending on usage and quantity. The product will be constant but the usage and quantity invoiced will be different each month. Is there any way of doing this with WHMCS? Kind Regards.