remsys

Does anyone know similar modules? I would like to purchase one.

We have a customer who wants to prepay 1 month in advance. Normally he is getting invoices several days before due date, for the next billing period. The only one solution for me is to bill him manually one time (the 1 month worth value ) , after edit the future generated invoices billing periods manually, every month. This is silly so I ask if anyone has other suggestions. Thanks for sharing ideas.