I need a very basic control panel for my hosting company where I can enter my customers, their package, their billing period and be able to create a pdf invoice which can be mailed to them. The pdf invoice must be customizable. Also, when the billing period is 1 month, it must automatically create the invoice and sent it to the customer 7 days or so before the end of the period.
The script must be very basic and is only for the admin. No users can enter the panel. For this reason I can not spend a lot of money on this and therefore I am especially aiming at scripters who maybe already made such a script and can make tiny modifications for my requirements as they are not extensive.